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max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices ________________________________________________________________ maxim integrated products 1 ordering information 19-0732; rev 0; 2/07 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. ? ? ? ? ? general description the max8662/MAX8663 power-management ics (pmics) are efficient, compact devices suitable for smart cellular phones, pdas, internet appliances, and other portable devices. they integrate two synchronous buck regulators, a boost regulator driving two to seven white leds, four low-dropout linear regulators (ldos), and a linear charger for a single-cell li-ion (li+) battery. maxim? smart power selector (sps) safely distrib- utes power between an external power source (ac adapter, auto adapter, or usb source), battery, and the system load. when system load peaks exceed the external source capability, the battery supplies supple- mental current. when system load requirements are small, residual power from the external power source charges the battery. a thermal-limiting circuit limits bat- tery-charge rate and external power-source current to prevent overheating. the pmic also allows the system to operate with no battery or a discharged battery. the max8662 is available in a 6mm x 6mm, 48-pin thin qfn package, while the MAX8663, without the led driver, is available in a 5mm x 5mm, 40-pin thin qfn package. features applications + denotes a lead-free package. * ep = exposed paddle. part temp range pin-package pkg code max8662 etm+ -40? to +85? 48 thin qfn-ep* 6mm x 6mm x 0.8mm t4866-1 MAX8663 etl+ -40? to +85? 40 thin qfn-ep* 5mm x 5mm x 0.8mm t4055-1 two 95%-efficient 1mhz buck regulators main regulator: 0.98v to v in at 1200ma core regulator: 0.98v to v in at 900ma 1mhz boost wled driver drives up to 7 white leds at 30ma (max) pwm and analog dimming control four low-dropout linear regulators 1.7v to 5.5v input range 15? quiescent current single-cell li+ charger adapter or usb input thermal-overload protection smart power selector (sps) ac adapter/usb or battery source charger-current and system-load sharing smart phones and pdas mp3 and portable media players palmtop and wireless handhelds top view max8662 thin qfn (6mm x 6mm) 13 14 15 16 17 18 19 20 21 22 23 24 thm iset ct ref gnd out4 in45 out5 en4 en5 pwm fb1 48 47 46 45 44 43 42 41 40 39 38 37 1 2 345678910 11 12 pok pset sl2 sl1 vl out7 in67 out6 pg3 lx3 en7 en6 cen chg brt bat2 bat1 sys2 sys1 dc2 dc1 en3 pen2 pen1 36 35 34 33 32 31 30 29 28 27 26 25 en1 pg1 lx1 pv1 ovp cs cc3 fb2 pv2 lx2 pg2 en2 pin configurations out1 0.98v to v in / 1.2a out2 0.98v to v in / 0.9a out3 30ma wled dc sys out7 en1 500ma 150ma 300ma 150ma li+ battery dc/usb input to system power bat lx1 lx2 lx3 (max8662 only) out6 out5 out4 cs to sys en2 en3 en4 en5 en6 en7 pwr ok charge status charge enable sl1 sl2 out4?ut7 voltage select max8662 MAX8663 pok chg cen typical operating circuit smart power selector is a trademark of maxim integrated products, inc. pin configurations continued at end of data sheet. evaluation kit available
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (input limiter and battery charger) (v dc = 5v, v bat = 4v, v cen = 0v, v pen_ = 5v, r pset = 3k , r iset = 3.15k , c ct = 0.068?, t a = -40? to +85?, unless otherwise noted.) (note 1) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. lx3 to gnd ............................................................-0.3v to +33v dc_ to gnd..............................................................-0.3v to +9v bat_ cen , chg , en_, pen_, pok , pv_, pwm, sys_, lx1, cs, lx2 to gnd .................................-0.3v to +6v vl to gnd ................................................................-0.3v to +4v brt, cc3, fb_, in45, in67, ovp, ref, sl_ to gnd ...........................................-0.3v to (v s ys + 0.3v) ct, iset, pset, thm to gnd .....................-0.3v to (v vl + 0.3v) out4, out5 to gnd................................-0.3v to (v in45 + 0.3v) out6, out7 to gnd................................-0.3v to (v in67 + 0.3v) pg_ to gnd...........................................................-0.3v to +0.3v bat1 + bat2 continuous current ...........................................3a sys1 + sys2 continuous current (2 pins) ..............................3a lx_ continuous current ........................................................1.5a continuous power dissipation (t a = +70?) 40-pin 5mm x 5mm thin qfn (derate 35.7mw/? above +70?) (multilayer board) .......................................................2857mw 48-pin 6mm x 6mm thin qfn (derate 37mw/? above +70?) (multilayer board)...2963mw operating temperature range ..........................-40? to +85? junction temperature range ............................-40? to +125? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units input limiter dc operating range v dc (note 2) 4.1 8.0 v dc undervoltage threshold v dc_l v dc rising, 500mv hysteresis 3.9 4.0 4.1 v dc overvoltage threshold v dc_h v dc rising, 100mv hysteresis 6.6 6.9 7.2 v i sys = i bat = 0ma, v cen = 0v 1.5 dc supply current i sys = i bat = 0ma, v cen = 5v 0.9 ma dc shutdown current v dc = 5v, v cen = 5v, v pen1 = v pen2 = 0v (usb suspend mode) 110 180 ? dc-to-sys dropout on-resistance r dc_sys v dc = 5v, i sys = 400ma, v cen = 5v 0.1 0.2 dc-to-bat dropout threshold v dr_dc_bat when v sys regulation and charging stops, v dc falling, 150mv hysteresis 20 50 85 mv vl voltage v vl i vl = 0 to 10ma 3.1 3.3 3.5 v sys regulation voltage v sys_reg v dc = 5.8v, i sys = 1ma, v cen = 5v 5.2 5.3 5.4 v v pen1 = 5v, v pen2 = 5v, r pset = 1.5k
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices _______________________________________________________________________________________ 3 electrical characteristics (i nput limiter and battery charger) (continued) (v dc = 5v, v bat = 4v, v cen = 0v, v pen_ = 5v, r pset = 3k , r iset = 3.15k , c ct = 0.068?, t a = -40? to +85?, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units battery charger bat-to-sys on-resistance r bat_reg v dc = 0v, v bat = 4.2v, i sys = 1a 40 80 m , v pen1 = v pen2 = 5v r iset = 7.87k (prequalification current is 10% of fast-charge current) 75 ma iset resistance range r iset guaranteed by bat charging current (1.5a to 300ma) 1.57 7.87 k (iset output voltage to actual charge-current ratio) 2 v/a charger soft-start time t ss_chg charge-current ramp time 1.5 ms bat prequalification threshold v bat rising, 180mv hysteresis 2.9 3.0 3.1 v v dc = 0v 0.01 5 bat leakage current v bat = 4.2v, outputs disabled v dc = v cen = 5v 0.01 5 ? chg and top-off threshold i bat where chg goes high, and top-off timer; i bat falling (7.5% of fast-charge current) r iset = 3.15k cen high to end of prequalification charge, v bat = 2.5v, c ct = 0.068? 30 min charge time t fst-chg from cen high to end of fast charge, c ct = 0.068? 300 min top-off time t top-off from chg high to end of fast charge, c ct = 0.068? 30 min charger thermal-limit temperature (note 4) 100 ? charger thermal-limit gain r pset = 3k 50 m a/c
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices 4 _______________________________________________________________________________________ electrical characteristics (i nput limiter and battery charger) (continued) (v dc = 5v, v bat = 4v, v cen = 0v, v pen_ = 5v, r pset = 3k , r iset = 3.15k , c ct = 0.068?, t a = -40? to +85?, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units thermistor input (thm) thm internal pullup resistance 10 k thm resistance threshold, hot resistance falling (1% hysteresis) 3.73 3.97 4.21 k logic i/o ( pok , chg , pen_, en_, pwm, cen ) input logic-high level 1.3 v input logic-low level 0.4 v v logic = 0v to 5.5v, t a = +25? -1 +0.001 +1 logic input-leakage current v logic = 5.5v, t a = +85? 0.01 ? logic output-voltage low i sink = 1ma 10 100 mv t a = +25? 0.001 1 logic output-high leakage current v logic = 5.5v t a = +85? 0.01 ? electrical characteristics (output regulator) (v sys_ = v pv_ = v in45 = v in67 = 4.0v, v brt = 1.25v, circuit of figure 1, t a = -40? to +85?, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units system sys operating range v sys 2.6 5.5 v s y s u nd er vol tag e thr eshol d v uvlo_sys v sys rising, 100mv hysteresis 2.4 2.5 2.6 v extra supply current when at least one output is on 35 70 out1 on, v pwm = 0v 16 35 out2 on, v pwm = 0v 16 35 ? out3 on 1 2 ma out4 on (current into in45) 20 30 out5 on (current into in45) 16 25 out6 on (current into in67) 17 27 sys bias current additional regulator supply current not including sys bias current out7 on (current in in67) 16 25 ? inter nal osci l l ator fr eq uency pwm frequency of out1, out2, and out3 0.9 1.0 1.1 mhz buck regulator 1 v pwm = 0v 16 35 ? supply current i sys + i pv1 , no load, not including sys bias current v pwm = 5v 2.9 ma output voltage range v out1 guaranteed by fb accuracy 0.98 3.30 v maximum output current i out1 1200 ma
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices _______________________________________________________________________________________ 5 electrical characteristics (output regulator) (continued) (v sys_ = v pv_ = v in45 = v in67 = 4.0v, v brt = 1.25v, circuit of figure 1, t a = -40? to +85?, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units fb regulation accuracy from v fb1 = 0.98v, i out1 = 0 to 1200ma, v out1 = 0.98v to 3.3v -3 +3 % fb1 input leakage current 0.01 0.10 ? v pv1 = 3.3v 0.12 0.24 pmos on-resistance i lx1 = 100ma v pv1 = 2.6v 0.15 v pv1 = 3.3v 0.2 0.4 nmos on-resistance i lx1 = 100ma v pv1 = 2.6v 0.3 pmos current limit 1.4 1.8 2.2 a s ki p m od e transi ti on c ur r ent 90 ma nmos zero-cross current 25 ma v lx1 = v pv1 = 5.5v 0.01 1.00 lx leakage v en1 = 0v, v sys = 5.5v, t a = +25c v lx1 = 0v, v pv1 = 5.5v -5.00 -0.01 ? buck regulator 2 v pwm = 0v 16 35 ? supply current i sys + i pv2 , no l oad , not i ncl ud i ng s y s b i as cur r ent v pwm = 5v 2.1 ma output voltage range guaranteed by fb accuracy 0.98 3.30 v maximum output current 900 ma fb regulation accuracy from v fb2 = 0.98v, i out2 = 0 to 600ma, v out2 = 0.98v to 3.3v -3 +3 % fb2 input leakage current 0.01 0.10 ? v pv2 = 3.3v 0.2 0.4 pmos on-resistance i lx2 = 100ma v pv2 = 2.6v 0.3 v pv2 = 3.3v 0.2 0.4 nmos on- resistance i lx2 = 100ma v pv2 = 2.6v 0.3 pmos current limit 1.07 1.30 1.55 a s ki p m od e transi ti on c ur r ent 90 ma nmos zero-cross current 25 ma v lx2 = v pv2 = 5.5v 0.01 1.00 lx leakage v en2 = 0v, v sys = 5.5v, t a = +25c v lx2 = 0v, v pv2 = 5.5v -5.00 -0.01 ? boost regulator for led driver supply current at s y s , no l oad , not i ncl ud i ng s y s b i as cur r ent switching 1 ma output range v out3 v sys 30 v minimum duty cycle d min 10 % maximum duty cycle d max 90 92 % cs regulation voltage v cs 0.29 0.32 0.35 v ovp regulation voltage duty = 90%, i lx3 = 0ma 1.225 1.250 1.275 v ovp sink current 19.2 20.0 20.8 ? ovp soft-start period time for i ovp to ramp from 0 to 20? 1.25 ms
electrical characteristics (output regulator) (continued) (v sys_ = v pv_ = v in45 = v in67 = 4.0v, v brt = 1.25v, circuit of figure 1, t a = -40? to +85?, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units t a = +25? 0.01 1 ovp leakage current v en3 = 0v, v ovp = v sys = 5.5v t a = +85? 0.1 ? nmos on-resistance i lx3 = 100ma 0.6 1.2 t a = +25? 0.01 5.00 nmos off-leakage current v lx3 = 30v t a = +85? 0.1 ? nmos current limit 500 620 900 ma led driver brt input range v brt i cs = 0 to 30ma 0 1.5 v ref voltage v ref i ref = 0ma 1.45 1.50 1.55 v t a = +25? -1 -0.01 +1 brt input current v brt = 0 to 1.5v t a = +85? 0.1 ? v brt = 1.5v 28 30 32 cs sink current v cs = 0.2v v brt = 50mv 0.4 0.8 1.2 ma cs current-source line regulation v sys = 2.7v to 5.5v 0.1 %/v pwm dimming en3 dc turn-on delay from v en3 = high to led on 1.5 2.0 2.5 ms en3 shutdown delay from v en3 = low to led off 1.5 2.0 2.5 ms maximum 1.5 2.0 ms pwm dimming capture period time between rising edges on en3 for pwm dimming to become active minimum 8 10 s pwm dimming pulse-width resolution resolution of high or low-pulse width on en3 for dimming change 0.5 ? linear regulators in 45, in 67 o p er ati ng rang e v in45 1.7 5.5 v in45, in67 undervoltage threshold v uvlo-in45 v in45 rising, 100mv hysteresis 1.5 1.6 1.7 v output noise f = 100hz to 100khz 200 ? rms psrr f = 100khz 30 db shutdown supply current v en4 = v en5 = 0v, t a = +25c 0.001 1a soft-start ramp time v out4 to 90% of final value 10 v/ms output discharge resistance in shutdown v en4 = 0v 0.5 1.0 2.0 k linear regulator 4 (ldo4) supply current at in45, v en5 = 0v i out4 = 0a 20 30 ? voltage accuracy i out4 = 0 to 500ma, v in45 = v out4 + 0.3v to 5.5v with 1.7v (min) -1.5 +1.5 % m i ni m um o utp ut c ap aci tor c out4 guaranteed stability, esr < 0.05 current limit v out4 = 0v 500 700 ma max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices 6 _______________________________________________________________________________________
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices _______________________________________________________________________________________ 7 electrical characteristics (output regulator) (continued) (v sys_ = v pv_ = v in45 = v in67 = 4.0v, v brt = 1.25v, circuit of figure 1, t a = -40? to +85?, unless otherwise noted.) (note 1) parameter symbol conditions min typ max units linear regulator 5 (ldo5) supply current at in45, v en4 = 0v i out5 = 0a 16 25 ? voltage accuracy i out5 = 0 to 150ma, v in45 = v out5 + 0.3v to 5.5v with 1.7v (min) -1.5 +1.5 % m i ni m um o utp ut c ap aci tor c out5 guaranteed stability, esr < 0.05 current limit v out5 = 0v 150 210 ma linear regulator 6 (ldo6) supply current at in67, v en6 = v sys , v en7 = 0v i out6 = 0a 17 27 ? voltage accuracy i out6 = 0 to 300ma, v in67 = v out6 + 0.3v to 5.5v -1.5 +1.5 % m i ni m um o utp ut c ap aci tor c out6 guaranteed stability, esr < 0.05 current limit v out6 = 0v 300 420 ma linear regulator 7 (ldo7) supply current at in67, v en6 = 0v, v en7 = v sys i out7 = 0a 16 25 ? voltage accuracy i out7 = 0 to 150ma, v in67 = v out7 + 0.3v to 5.5v with 1.7v (min) -1.5 +1.5 % m i ni m um o utp ut c ap aci tor c out7 guaranteed stability, esr < 0.05 current limit v out7 = 0v 150 210 ma thermal shutdown thermal-shutdown temperature t j rising 165 ? thermal-shutdown hysteresis 15 ? note 1: limits are 100% production tested at t a = +25?. limits over the operating temperature range are guaranteed through correlation using statistical quality control (sqc) methods. note 2: input withstand voltage. not designed to operate above v dc = 6.5v due to thermal-dissipation issues. note 3: iset voltage when ct timer stops. occurs only when in constant-current mode. translates to 20% of fast-charge current. note 4: temperature at which the input current limit begins to reduce.
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices 8 _______________________________________________________________________________________ typical operating characteristics (circuit of figure 1, v dc = 5v, r pset = 1.5k , r iset = 3k , v out1 = 3.3v, v out2 = 1.3v, sl1 = sl2 = open, v cen = 0v, v pen1 = v pen2 = 5v, c out1 = 2 x 10?, c out2 = 2 x 10?, c out3 = 0.1?, c out4 = 4.7?, c out5 = 1?, c out6 = 2.2?, c out7 = 1?, ct = 0.068?, c ref = c vl = 0.1?, r thm = 10k , l1 = 3.3?, l2 = 4.7?, l3 = 22?, gnd = pg1 = pg2 = pg3 = 0, t a = +25?, unless otherwise noted.) input quiescent current vs. input voltage (charger enabled) max8662/63 toc01 input voltage (v) input quiescent current (ma) 7 6 5 4 3 2 1 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 08 v bat = 4.2v i sys = 0 charger in done mode v bat rising v bat falling input quiescent current vs. input voltage (charger disabled) max8662/63 toc02 input voltage (v) input quiescent current (ma) 7 6 5 4 3 2 1 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 08 v bat = 3.6v v bat rising v bat falling input quiescent current vs. input voltage (suspend) max8662/63 toc03 input voltage (v) input quiescent current (ma) 7 6 4 5 2 3 1 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20 0 08 v bat = 4.2v i sys = 0ma pen1 = pen2 = 0 cen = 1 battery-leakage current vs. battery voltage max8662/63 toc04 battery voltage (v) battery-leakage current ( a) 4 3 2 1 0.1 0.2 0.3 0.4 0.5 0 05 en_ = 0, cen = 1 v dc open v dc = 5v battery-leakage current vs. temperature (input disconnected) max8662/63 toc05 ambient temperature ( c) battery-leakage current ( a) 60 35 10 -15 0.3 0.5 0.4 0.6 0.7 0.8 0.2 -40 85 v bat = 4.0v en_ = 0 battery-regulation voltage vs. temperature max8662/63 toc06 ambient temperature ( c) battery-regulation voltage (v) 60 35 10 -15 4.180 4.175 4.185 4.195 4.190 4.200 4.170 -40 85 en_ = 0 charge current vs. battery voltage (100ma usb) max8662/63 toc07 battery voltage (v) charge current (ma) 4 3 2 1 10 20 30 40 50 60 70 80 90 100 0 05 v dc = 5v r iset = 3k pen1 = pen2 = 0 v bat falling v bat rising charge current vs. battery voltage (500ma usb) max8662/63 toc08 battery voltage (v) charge current (ma) 4.5 4.0 3.0 3.5 1.0 1.5 2.0 2.5 0.5 50 100 150 200 250 300 350 400 450 500 550 0 05.0 v dc = 5v r iset = 3k pen1 = 0 pen2 = 1 v bat falling v bat rising charge current vs. battery voltage (ac adapter) max8662/63 toc09 battery voltage (v) charge current (ma) 4 3 1 2 100 200 300 400 600 500 700 800 0 05 v dc = 5v r iset = 3k pen1 = pen2 = 1 v bat falling v bat rising
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices _______________________________________________________________________________________ 9 charge current vs. ambient temperature (low ic power dissipation) max8662/63 toc10 ambient temperature ( c) charge current (ma) 60 35 10 -15 100 200 300 400 500 600 700 800 900 0 -40 85 pen1 = pen2 = 1 pen1 = pen2 = 0 pen1 = 0, pen2 = 1 v dc = 5.0v, v bat = 4.0v r iset = 3k , cen = 0, en_ = 0 charge current vs. ambient temperature (high ic power dissipation) max8662/63 toc11 ambient temperature ( c) charge current (ma) 60 35 10 -15 100 200 300 400 500 600 700 800 900 0 -40 85 pen1 = pen2 = 1 pen1 = pen2 = 0 pen1 = 0, pen2 = 1 v dc = 6.5v, v bat = 3.1v r iset = 3k , cen = 0, en_ = 0 sys output voltage vs. input voltage max8662/63 toc12 input voltage (v) v sys (v) 7 6 5 34 12 3.8 4.2 4.0 4.6 4.4 5.2 5.0 4.8 5.4 5.6 3.6 08 v bat = 4.0v i sys = 0ma pen1 = 0 pen2 = 1 charger disabled charger enabled sys output voltage vs. sys output current (dc disconnected) max8662/63 toc13 i sys (a) v sys (v) 2.5 2.0 1.5 1.0 0.5 3.8 4.0 4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 3.6 03.0 v bat = 4.0v v dc = 0v the slope of this line shows that the bat-to-sys resistance is 49m . sys output voltage vs. sys output current (500ma usb) max8662/63 toc14 i sys (a) v sys (v) 2.5 2.0 1.5 1.0 0.5 3.8 4.0 4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 3.6 03.0 v dc = 5.0v v bat = 4.0v pen1 = 0, pen2 = 1 cen = 1 sys output voltage vs. sys output current (ac adapter) max8662/63 toc15 i sys (a) v sys (v) 2.5 2.0 1.5 1.0 0.5 3.8 4.0 4.2 4.4 4.6 4.8 5.0 5.2 5.4 5.6 3.6 03.0 v dc = 5.0v v bat = 4.0v pen1 = pen2 = 1 cen = 1 usb connect (i sys = 0ma) max8662/63 toc16 200 s/div pen1 = pen2 = 0, cen = 0, v bat = 4.0v, i sys = 0ma, en_ = 1 v dc i in v sys v pok v chg i bat 0v 0v 0ma 0ma 4.0v 5v 4.4v 5v +95ma +95ma 5v/div 5v/div 5v/div 2v/div 200ma/div 200ma/div negative battery current flows into the battery (charging). usb connect (i sys = 50ma) max8662/63 toc17 200 s/div pen1 = pen2 = 0, cen = 0, v bat = 4.0v, i sys = 50ma, en_ = 1 v dc i in v sys v pok v chg i bat negative battery current flows into the battery (charging). 0v 0v 0v 0ma 50ma 4.0v 4.4v 5v/div 5v/div 5v/div 2v/div 200ma/div 200ma/div 5v 5v +95ma -45ma typical operating characteristics (continued) (circuit of figure 1, v dc = 5v, r pset = 1.5k , r iset = 3k , v out1 = 3.3v, v out2 = 1.3v, sl1 = sl2 = open, v cen = 0v, v pen1 = v pen2 = 5v, c out1 = 2 x 10?, c out2 = 2 x 10?, c out3 = 0.1?, c out4 = 4.7?, c out5 = 1?, c out6 = 2.2?, c out7 = 1?, ct = 0.068?, c ref = c vl = 0.1?, r thm = 10k , l1 = 3.3?, l2 = 4.7?, l3 = 22?, gnd = pg1 = pg2 = pg3 = 0, t a = +25?, unless otherwise noted.)
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices 10 ______________________________________________________________________________________ ac adapter connect (i sys = 500ma) max8662/63 toc18 400 s/div pen1 = pen2 = 1, cen = 0, v bat = 4.0v, i sys = 500ma, en_ = 1 v dc i in v sys v pok v chg i bat negative battery current flows into the battery (charging). 0v 0v 0ma 500ma 4.0v 4.4v 5v 5v/div 5v/div 5v/div 2v/div 1a/div 1a/div 5v +1280ma -780ma usb disconnected (500ma usb) max8662/63 toc19 200 s/div pen1 = 0, pen2 = 1, cen = 0, v bat = 4.0v, i sys = 0ma v dc i in v sys v chg i bat 0v 0ma 4.4v 5v 5v/div 5v/div 500ma/div 500ma/div 1v/div 475ma -475ma charger enable (i sys = 0ma) max8662/63 toc20 200 s/div pen1 = 0, pen2 = 1, v bat = 4.0v, i sys = 0ma, en_ = 1 v cen i in v sys v chg i bat 2.8v 0v 0ma 0ma 5v 4.4v 0v 475ma -475ma 5v/div 5v/div 500ma/div 2v/div 1a/div out1 regulator efficiency vs. load current max8662/63 toc21 load current (ma) out1 regulator efficiency (%) 1000 100 10 1 10 20 30 40 50 60 70 80 90 100 0 0.1 10,000 v bat = 4.2v v bat = 3.6v pwm = 0 pwm = 1 v bat = 4.2v v bat = 3.6v v out1 = 3.3v typical operating characteristics (continued) (circuit of figure 1, v dc = 5v, r pset = 1.5k , r iset = 3k , v out1 = 3.3v, v out2 = 1.3v, sl1 = sl2 = open, v cen = 0v, v pen1 = v pen2 = 5v, c out1 = 2 x 10?, c out2 = 2 x 10?, c out3 = 0.1?, c out4 = 4.7?, c out5 = 1?, c out6 = 2.2?, c out7 = 1?, ct = 0.068?, c ref = c vl = 0.1?, r thm = 10k , l1 = 3.3?, l2 = 4.7?, l3 = 22?, gnd = pg1 = pg2 = pg3 = 0, t a = +25?, unless otherwise noted.) out1 regulator line regulation max8662/63 toc23 v sys (v) output voltage (v) 5.1 4.7 3.9 4.3 3.5 3.1 2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 2.5 2.7 5.5 r load = 330 out1 voltage vs. temperature max8662/63 toc24 ambient temperature ( c) output voltage (v) 60 35 10 -15 3.294 3.298 3.302 3.306 3.310 3.290 -40 85 v bat = 4.0v r load = 330 out1 regulator load regulation max8662/63 toc22 load current (ma) output voltage (v) 1000 100 10 1 3.24 3.28 3.32 3.36 3.40 3.20 0.1 10,000 v bat = 4.2v v bat = 3.6v
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices ______________________________________________________________________________________ 11 out1 regulator light-load switching waveforms max8662/63 toc25 20 s/div v out1 ac-coupled v lx i l 50mv/div 2v/div 200ma/div v bat = 4.0v i out1 = 10ma pwm = 0 out1 regulator heavy-load switching waveforms max8662/63 toc26 1 s/div v out1 ac-coupled v lx i l 10mv/div 2v/div 500ma/div v bat = 4.2v i out1 = 1200ma out1 regulator load- transient response max8662/63 toc27 40 s/div v out1 v lx i out1 i l 100mv/div 5v/div 1a/div 1a/div v bat = 4.0v i out1 = 10ma to 1200ma to 10ma pwm = 0 out1 regulator line- transient response max8662/63 toc28 100 s/div v out1 v sys v lx i l 200ma/div 5v/div 50mv/div 1v/div i out1 = 10ma pwm = 0 5v 4v out1 enable and disable response max8662/63 toc29 1ms/div v out1 v en1 2v/div 2v/div i out1 = 10ma typical operating characteristics (continued) (circuit of figure 1, v dc = 5v, r pset = 1.5k , r iset = 3k , v out1 = 3.3v, v out2 = 1.3v, sl1 = sl2 = open, v cen = 0v, v pen1 = v pen2 = 5v, c out1 = 2 x 10?, c out2 = 2 x 10?, c out3 = 0.1?, c out4 = 4.7?, c out5 = 1?, c out6 = 2.2?, c out7 = 1?, ct = 0.068?, c ref = c vl = 0.1?, r thm = 10k , l1 = 3.3?, l2 = 4.7?, l3 = 22?, gnd = pg1 = pg2 = pg3 = 0, t a = +25?, unless otherwise noted.) out2 regulator efficiency vs. load current max8662/63 toc30 load current (ma) out2 regulator efficiency (%) 100 10 1 10 20 30 40 50 60 70 80 90 100 0 0.1 1000 v bat = 4.2v v bat = 4.2v v bat = 3.6v v bat = 3.6v pwm = 0 pwm = 1 v out1 = 3.3v max8662/63 toc31 load current (ma) output voltage (v) 1000 100 10 1 1.27 1.28 1.29 1.30 1.31 1.32 1.26 0.1 10,000 out2 regulator load regulation v bat = 3.6v v bat = 4.2v
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices 12 ______________________________________________________________________________________ out2 regulator line- transient response max8662/63 toc37 100 s/div v out1 i l v sys v lx 200ma/div 1v/div 5v/div 20mv/div i out1 = 10ma pwm = 0 4v 5v out2 regulator line regulation max8662/63 toc32 v sys (v) output voltage (v) 5.1 4.3 4.7 3.9 3.1 3.5 1.304 1.302 1.306 1.308 1.310 1.300 2.7 5.5 r load = 130 out2 voltage vs. temperature max8662/63 toc33 ambient temperature ( c) output voltage (v) 60 35 10 -15 1.3035 1.3040 1.3045 1.3050 1.3030 -40 85 v bat = 4.0v r load = 130 out2 regulator light-load switching waveforms max8662/63 toc34 10 s/div v out2 ac-coupled i l v lx 20mv/div 100ma/div 2v/div v bat = 4.0v i out2 = 10ma pwm = 0 out2 regulator heavy-load switching waveforms max8662/63 toc35 1 s/div v out2 ac-coupled i l v l 10mv/div 500ma/div 2v/div v bat = 4.0v i out2 = 900ma out2 regulator load- transient response max8662/63 toc36 40 s/div i out2 v out2 ac-coupled i l v lx 50mv/div 500ma/div 5v/div 1a/div v bat = 4.0v i out2 = 10ma to 900ma to 10ma pwm = 0 typical operating characteristics (continued) (circuit of figure 1, v dc = 5v, r pset = 1.5k , r iset = 3k , v out1 = 3.3v, v out2 = 1.3v, sl1 = sl2 = open, v cen = 0v, v pen1 = v pen2 = 5v, c out1 = 2 x 10?, c out2 = 2 x 10?, c out3 = 0.1?, c out4 = 4.7?, c out5 = 1?, c out6 = 2.2?, c out7 = 1?, ct = 0.068?, c ref = c vl = 0.1?, r thm = 10k , l1 = 3.3?, l2 = 4.7?, l3 = 22?, gnd = pg1 = pg2 = pg3 = 0, t a = +25?, unless otherwise noted.)
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices _____________________________________________________________________________________ 13 out2 enable and disable response max8662/63 toc38 1 s/div v out2 v en2 2v/div 1v/div i out2 = 10ma 0v 0v led current vs. pwm dimming duty cycle max8662/63 toc39 duty cycle (%) led current (ma) 80 60 40 20 1.0 0.5 2.0 1.5 2.5 3.5 3.0 4.5 4.0 5.0 0 090 70 50 30 10 100 v bat = 3.6v v brt = 0.25v f = 1khz led current vs. brt voltage max8662/63 toc40 brt voltage (v) led current (ma) 1.2 0.9 0.6 0.3 5 10 15 20 25 30 0 01.5 v bat = 3.6v out4 regulator load regulation max8662/63 toc44 load current (ma) output voltage (v) 400 300 200 100 3.285 3.290 3.295 3.300 3.305 3.310 3.315 3.280 0 500 v in = 5.5v v in = 3.6v out4 regulator line regulation max8662/63 toc45 v in_out4 (v) output voltage (v) 5 4 3 2 1.8 2.2 3.0 2.6 3.4 1.4 16 r load = 330 typical operating characteristics (continued) (circuit of figure 1, v dc = 5v, r pset = 1.5k , r iset = 3k , v out1 = 3.3v, v out2 = 1.3v, sl1 = sl2 = open, v cen = 0v, v pen1 = v pen2 = 5v, c out1 = 2 x 10?, c out2 = 2 x 10?, c out3 = 0.1?, c out4 = 4.7?, c out5 = 1?, c out6 = 2.2?, c out7 = 1?, ct = 0.068?, c ref = c vl = 0.1?, r thm = 10k , l1 = 3.3?, l2 = 4.7?, l3 = 22?, gnd = pg1 = pg2 = pg3 = 0, t a = +25?, unless otherwise noted.) out4 voltage vs. temperature max8662/63 toc46 ambient temperature ( c) output voltage (v) 60 35 10 -15 3.309 3.311 3.313 3.315 3.305 3.307 -40 85 v bat = 4.0v r load = 330 out3 switching waveforms max8662/63 toc41 1 s/div v out3 ac-coupled i l v lx 100ma/div 200mv/div 10v/div i out3 = 1ma out3 enable and disable response max8662/63 toc42 40ms/div v out3 v en3 2v/div 10v/div 0v 0v out3 regulator efficiency vs. load current max8662/63 toc43 load current (ma) out2 regulator efficiency (%) 20 10 40 30 50 70 60 90 80 100 0 0.1 10 1100 v sys = 4.2v v sys = 3.6v v sys = 5.5v
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices 14 ______________________________________________________________________________________ typical operating characteristics (continued) (circuit of figure 1, v dc = 5v, r pset = 1.5k , r iset = 3k , v out1 = 3.3v, v out2 = 1.3v, sl1 = sl2 = open, v cen = 0v, v pen1 = v pen2 = 5v, c out1 = 2 x 10?, c out2 = 2 x 10?, c out3 = 0.1?, c out4 = 4.7?, c out5 = 1?, c out6 = 2.2?, c out7 = 1?, ct = 0.068?, c ref = c vl = 0.1?, r thm = 10k , l1 = 3.3?, l2 = 4.7?, l3 = 22?, gnd = pg1 = pg2 = pg3 = 0, t a = +25?, unless otherwise noted.) out4 regulator load- transient response max8662/63 toc47 40 s/div v out4 ac-coupled i out4 500ma/div 50mv/div v bat = 4.0v i out4 = 10ma to 500ma to 10ma out4 regulator line- transient response max8662/63 toc48 100 s/div v out4 ac-coupled v in45 2v/div 20mv/div i out4 = 10ma 3.6v 5v out4 enable and disable response max8662/63 toc49 200 s/div v out4 v en4 2v/div 2v/div 0v 0v out4 regulator dropout voltage vs. load current max8662/63 toc50 load current (ma) dropout voltage (mv) 400 300 200 100 10 40 50 30 20 60 70 90 80 100 0 0 500 the slope of this line shows that the dropout resistance of an average part and board combination is 181m . out5 regulator load regulation max8662/63 toc51 load current (ma) output voltage (v) 120 90 60 30 3.302 3.304 3.308 3.306 3.310 3.300 0150 v in = 3.6v v in = 5.5v out5 regulator line regulation max8662/63 toc52 v in_out5 (v) output voltage (v) 5 4 3 2 1.8 2.2 3.0 2.6 3.4 1.4 16 r load = 330 out5 voltage vs. temperature max8662/63 toc53 ambient temperature ( c) output voltage (v) 60 35 10 -15 3.305 3.307 3.306 3.309 3.308 3.310 3.304 -40 85 v bat = 4.0v r load = 330
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices ______________________________________________________________________________________ 15 out5 regulator load- transient response max8662/63 toc54 40 s/div v out5 ac-coupled i out5 100ma/div 50mv/div v bat = 4.0v i out5 = 10ma to 150ma to 10ma out5 regulator line- transient response max8662/63 toc55 100 s/div v out5 ac-coupled v in45 2v/div 20mv/div i out5 = 10ma 3.6v 5v out5 enable and disable response max8662/63 toc56 200 s/div v out5 v en5 2v/div 2v/div 0v 0v out5 regulator dropout voltage vs. load current max8662/63 toc57 i out (ma) dropout voltage (v) 120 90 60 30 10 30 20 40 50 60 70 0 0 150 the slope of this line shows that the dropout resistance of an average part and board combination is 384m . out6 regulator load regulation max8662/63 toc58 load current (ma) output voltage (v) 250 150 200 100 50 3.294 3.298 3.302 3.306 3.310 3.290 0 300 v in = 5.5v v in = 3.6v out6 regulator line regulation max8662/63 toc59 v in_out6 (v) output voltage (v) 5 4 3 2 1.8 1.6 2.0 2.4 2.2 3.2 3.0 2.8 2.6 3.4 1.4 16 r load = 330 out6 voltage vs. temperature max8662/63 toc60 ambient temperature ( c) output voltage (v) 60 35 10 -15 3.303 3.305 3.307 3.309 3.301 -40 85 v bat = 4.0v r load = 330 typical operating characteristics (continued) (circuit of figure 1, v dc = 5v, r pset = 1.5k , r iset = 3k , v out1 = 3.3v, v out2 = 1.3v, sl1 = sl2 = open, v cen = 0v, v pen1 = v pen2 = 5v, c out1 = 2 x 10?, c out2 = 2 x 10?, c out3 = 0.1?, c out4 = 4.7?, c out5 = 1?, c out6 = 2.2?, c out7 = 1?, ct = 0.068?, c ref = c vl = 0.1?, r thm = 10k , l1 = 3.3?, l2 = 4.7?, l3 = 22?, gnd = pg1 = pg2 = pg3 = 0, t a = +25?, unless otherwise noted.)
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices 16 ______________________________________________________________________________________ typical operating characteristics (continued) (circuit of figure 1, v dc = 5v, r pset = 1.5k , r iset = 3k , v out1 = 3.3v, v out2 = 1.3v, sl1 = sl2 = open, v cen = 0v, v pen1 = v pen2 = 5v, c out1 = 2 x 10?, c out2 = 2 x 10?, c out3 = 0.1?, c out4 = 4.7?, c out5 = 1?, c out6 = 2.2?, c out7 = 1?, ct = 0.068?, c ref = c vl = 0.1?, r thm = 10k , l1 = 3.3?, l2 = 4.7?, l3 = 22?, gnd = pg1 = pg2 = pg3 = 0, t a = +25?, unless otherwise noted.) out6 regulator load- transient response max8662/63 toc61 40 s/div v out6 ac-coupled i out6 200ma/div 50mv/div v bat = 4.0v i out6 = 10ma to 300ma to 10ma out6 regulator line- transient response max8662/63 toc62 100 s/div v out6 ac-coupled v in67 2v/div 20mv/div i out6 = 10ma 3.6v 5v out6 enable and disable response max8662/63 toc63 200 s/div v out6 v en6 2v/div 2v/div 0v 0v out6 regulator dropout voltage vs. load current max8662/63 toc64 i out (ma) dropout voltage (mv) 250 200 150 100 50 10 30 40 20 50 60 70 80 0 0300 the slope of this line shows that the dropout resistance of an average part and board combination is 238m . out7 regulator load regulation max8662/63 toc65 load current (ma) output voltage (v) 120 90 60 30 3.296 3.300 3.298 3.302 3.304 3.294 0 150 v in = 5.5v v in = 3.6v out7 regulator line regulation max8662/63 toc66 v in_out7 (v) output voltage (v) 5 4 3 2 1.8 1.6 2.0 2.4 2.2 3.2 3.0 2.8 2.6 3.4 1.4 16 r load = 330 out7 voltage vs. temperature max8662/63 toc67 ambient temperature ( c) output voltage (v) 60 35 10 -15 3.299 3.301 3.300 3.302 3.303 3.298 -40 85 v bat = 4.0v r load = 330
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices ______________________________________________________________________________________ 17 out7 regulator load- transient response max8662/63 toc68 40 s/div v out7 ac-coupled i out7 100ma/div 50mv/div v bat = 4.0v i out7 = 10ma to 150ma to 10ma out7 regulator line- transient response max8662/63 toc69 100 s/div v out7 ac-coupled v in67 2v/div 20mv/div i out7 = 10ma 3.6v 5v out7 enable and disable response max8662/63 toc70 200 s/div v out7 v en7 2v/div 2v/div 0v 0v out7 regulator dropout voltage vs. load current max8662/63 toc71 i out (ma) dropout voltage (v) 125 100 75 50 25 10 30 20 40 50 60 70 0 0 150 the slope of this line shows that the dropout resistance of an average part and board combination is 391m . max8662/63 toc72 load current (ma) output voltage (v) 8 6 4 29 7 5 3 3.25 3.27 3.28 3.26 3.29 3.30 3.31 3.24 01 10 vl regulator load regulation v in = 5.5v v in = 4.35v max8662/63 toc73 v in (v) output voltage (v) 7 6 5 4 3.10 3.05 3.20 3.30 3.15 3.25 3.35 3.40 3.45 3.50 3.00 38 vl regulator line regulation r load = 3.3k max8662/63 toc74 i sink (ma) output low voltage (v) 35 30 25 20 15 10 5 0.1 0.2 0.3 0.4 0.5 0 040 v in = 5.0v v bat = 4.0v the slope of this line shows that the pulldown resistance is 11 . pulldown device has a 20ma steady-state rating open-drain output voltage low vs. sink current typical operating characteristics (continued) (circuit of figure 1, v dc = 5v, r pset = 1.5k , r iset = 3k , v out1 = 3.3v, v out2 = 1.3v, sl1 = sl2 = open, v cen = 0v, v pen1 = v pen2 = 5v, c out1 = 2 x 10?, c out2 = 2 x 10?, c out3 = 0.1?, c out4 = 4.7?, c out5 = 1?, c out6 = 2.2?, c out7 = 1?, ct = 0.068?, c ref = c vl = 0.1?, r thm = 10k , l1 = 3.3?, l2 = 4.7?, l3 = 22?, gnd = pg1 = pg2 = pg3 = 0, t a = +25?, unless otherwise noted.)
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices 18 ______________________________________________________________________________________ pin description pin max8662 MAX8663 name function 1 1 pen1 inp ut li m i ter - c ontr ol inp ut 1. u sed w i th ce n and p e n 2 to set the d c cur r ent l i m i t to 95m a, 475m a, a r esi stor p r og r am m ab l e l evel up to 2a, or to tur n off the i np ut l i m i ter ( see tab l e 1) . 2 2 pen2 inp ut li m i ter - c ontr ol inp ut 2. u sed w i th ce n and p e n 1 to set the d c cur r ent l i m i t to 95m a, 475m a, a r esi stor p r og r am m ab l e l evel up to 2a, or to tur n off the i np ut l i m i ter ( see tab l e 1) . 3 en3 enable input and pwm dimming input for regulator 3 white led boost. drive high to enable. drive low for more than 2ms to turn off. for pwm-controlled dimming, drive en3 with a pwm switching input with a frequency of 1khz to 100khz. 4, 5 3, 4 dc1, dc2 dc input source. connect to an ac adapter or usb source. dc1 and dc2 are internally connected. 6, 7 5, 6 sys1, sys2 system supply voltage. the sys output supplies power to all regulators. with no external power, sys1 and sys2 connect to bat through an internal 40m switch. when a valid voltage is present at dc_, sys_ connects to dc_ but is limited to 5.3v. sys1 and sys2 are internally connected. 8, 9 7, 8 bat1, bat2 battery connections. connect to a single-cell li+ battery. the battery is charged from sys_ when a valid source is present at dc. bat_ drives sys_ when dc is not valid. bat1 and bat2 are internally connected. 10 brt led analog brightness control input. connect brt to a voltage from 50mv to 1.5v to set i cs from 1ma to 30ma. connect brt to the center of a resistor-divider connected between ref and gnd to set a fixed brightness when analog dimming is not required. 11 9 chg charger status output. chg is an open-drain nmos that pulls low when the charger is in fast charge or prequalification modes. chg goes high impedance when the charger is in top-off mode or disabled. 12 10 cen charger enable input. drive cen low to enable the charger when a valid source is connected at dc. drive cen high to disable charging. drive cen high and pen2 low to enter usb suspend mode. 13 11 thm thermistor input. connect a 10k negative temperature coefficient (ntc) thermistor from thm to gnd. charging is suspended when the temperature is beyond the hot or cold limits. connect thm to gnd to disable the thermistor functionality. 14 12 iset charge rate-set input. connect a resistor from iset to gnd to set the fast-charge current from 300ma to 1.25a. the prequalification charge current and top-off threshold are set to 10% and 7.5% of fast-charge current, respectively. 15 13 ct charge timer-programming pin. connect a capacitor from ct to gnd to set the length of time required to trigger a fault condition in fast-charge or prequalification mode and to determine the time the charger remains in top-off mode. connect ct to gnd to disable timers. 16 ref reference voltage. provides 1.5v output when en3 is high. an internal discharge resistance pulls ref to 0v when en3 is low. 17 14 gnd ground. low-noise ground connection. 18 15 out4 linear regulator 4 output. delivers up to 500ma at an output voltage determined by sl1 and sl2. connect a 4.7? ceramic capacitor from out4 to gnd. increase the value to 10? if v out4 < 1.5v.
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices ______________________________________________________________________________________ 19 pin description (continued) pin max8662 MAX8663 name function 19 16 in45 input supply for linear regulators 4 and 5. connect in45 to a supply voltage between 1.7v and v sys . connect at least a 1? ceramic capacitor from in45 to gnd. 20 17 out5 linear regulator 5 output. delivers up to 150ma at an output voltage determined by sl1 and sl2. connect a 1? ceramic capacitor from out5 to gnd. increase the value to 2.2? if v out5 < 1.5v. 21 18 en4 enable input for linear regulator 4. drive high to enable. 22 19 en5 enable input for linear regulator 5. drive high to enable. 23 20 pwm pwm/skip-mode selector. drive pwm high to force step-down regulators 1 and 2 to operate in 1mhz forced-pwm mode. drive pwm low, or connect to gnd to allow regulators 1 and 2 to enter skip mode at light loads. 24 21 fb1 feedback input for buck regulator 1. connect fb1 to the center of a resistor-divider connected between out1 and gnd to set the output voltage between 0.98v and 3.3v. 25 22 en1 enable input for buck regulator 1. drive high to enable. 26 23 pg1 power ground for buck regulator 1. gnd, pg1, pg2, and pg3 must be connected together externally. 27 24 lx1 buck regulator 1 inductor connection node. connect an inductor from lx1 to the output of regulator 1. 28 25 pv1 p ow er inp ut for buck reg ul ator 1. c onnect p v 1 to s y s and d ecoup l e w i th a 10? or g r eater l ow - e s r cap aci tor to gn d . p v 1, p v 2, and s y s m ust b e connected tog ether exter nal l y. 29 ovp led boost overvoltage input. connect a resistor from ovp to the boost output to set the maximum output voltage and to initiate soft-start when en3 goes high. an internal 20? pulldown current from ovp to gnd determines the maximum boost voltage. the internal current is disconnected when en3 is low. ovp is diode clamped to sys_. 30 cs led current source. sinks from 1ma to 30ma depending on the voltage at brt and the pwm signal at en3. driving en3 low for more than 2ms turns off the current source. v cs is regulated to 0.32v. 31 cc3 c om p ensati on inp ut for le d boost regul ator 3. s ee the boost c onverter w i th whi te le d d r i ver ( ou t3, m ax 8662 onl y) secti on. 32 26 fb2 feedback input for buck regulator 2. connect fb2 to the center of a resistor-divider connected between out2 and gnd to set the output voltage between 0.98v and 3.3v. 33 27 pv2 power input for buck regulator 2. connect pv2 to sys and decouple with a 10? or greater low-esr capacitor to gnd. pv1, pv2, and sys must be connected together externally. 34 28 lx2 buck regulator 2 inductor connection node. connect an inductor from lx2 to the output of regulator 2. 35 29 pg2 p ower gr ound for buck reg ulator 2. gn d , p g1, p g2, and pg3 must b e connected together exter nal l y. 36 30 en2 enable input for buck regulator 2. drive high to enable. 37 31 en6 enable input for linear regulator 6. drive high to enable. 38 32 en7 enable input for linear regulator 7. drive high to enable. 39 lx3 boost regulator 3 inductor connection node. connect an inductor from lx3 to sys_.
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices 20 ______________________________________________________________________________________ pin description (continued) pin max8662 MAX8663 name function 40 pg3 power ground for boost regulator 3. gnd, pg1, pg2, and pg3 must be connected together externally. 41 33 out6 linear regulator 6 output. delivers up to 300ma at an output voltage determined by sl1 and sl2. connect a 2.2? ceramic capacitor from out6 to gnd. increase the value to 4.7? if v out6 < 1.5v. 42 34 in67 input supply for linear regulators 6 and 7. connect in67 to a supply voltage of 1.7v to v sys . connect at least a 1? ceramic capacitor from in67 to gnd. 43 35 out7 linear regulator 7 output. delivers up to 150ma at an output voltage determined by sl1 and sl2. connect a 1? ceramic capacitor from out7 to gnd. increase the value to 2.2? if v out7 < 1.5v. 44 36 vl input limiter and charger logic supply. provides 3.3v when a valid input voltage is present at dc. connect a 0.1? capacitor from vl to gnd. vl is capable of providing up to 10ma to an external load when dc is valid. 45 37 sl1 46 38 sl2 output-voltage select inputs 1 and 2 for linear regulators. leave disconnected, or connect to gnd or sys to set to one of three states. sl1 and sl2 set the output voltage of out4, out5, out6, and out7 to one of nine combinations. see table 3. 47 39 pset input current-limit set input. connect a resistor (r pset ) from pset to ground to program the dc input current limit from 500ma to 2a. 48 40 pok power-ok output. pok is an open-drain nmos output that pulls low when a valid input is detected at dc. this output is not affected by the states of pen1, pen2, or cen . ep exposed paddle. connect the exposed paddle to ground. connecting the exposed paddle to ground does not remove the requirement for proper ground connections to gnd, pg1, pg2, and pg3. the exposed paddle is attached with epoxy to the substrate of the die, making it an excellent path to remove heat from the ic.
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices ______________________________________________________________________________________ 21 pset iset pen2 500ma 100ma pen1 ct chg battery charger ok timeout done charging adapter usb cen off on r7 r8 r9 c12 dc1 gnd input from ac adapter/usb 4.1v to 8v pok sys1 bat1 3.3v vl 1.5v ref main battery pwm skip pwm lx3 en3 pg3 step-up led driver pwm brightness control and enable cs ovp brt in45 in67 ldo output- voltage setting en4 on off en5 on off en6 on off en7 on off out4 500ma out4 out5 out6 out7 sl1 sl2 tri-state mode inputs; see table 2 input-to-sys current- limiting switch battery-to-sys switch (allows bat and dc to supply current to sys) analog dimming (0 to 1.5v) thm battery thermistor cc3 c8 r1 c2 c1 c11 r6 l3 d1 d2 c14 c15 r10 c13 c16 input- voltage monitor input limiter and thermal protection + - 100mv e p only available for the max8662 dc2 sys2 bat2 out3 at 30ma vlogic sys vlogic c10 c3 - + lx1 l1 pg1 pv1 c4 r2 r3 c5 main step-down regulator fb1 en1 on off out1 0.98v to 3.3v at 1.2a main sys lx2 l2 pg2 pv2 c6 r4 r5 c7 core step-down regulator fb2 en2 on off out2 0.98v to 3.3v at 0.9a core sys sys out5 150ma out6 300ma out7 150ma sys c17 c18 c19 c9 sys max8662 MAX8663 d3 d4 d5 d6 d7 d8 d9 to sys { figure 1. block diagram and application circuit
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices 22 ______________________________________________________________________________________ detailed description the max8662/MAX8663 highly integrated pmics are designed for use in smart cellular phones, pdas, internet appliances, and other portable devices. they integrate two synchronous buck regulators, a boost regulator driving two to seven white leds (max8662 only), four low dropout (ldo) linear regulators, and a linear charger for a single-cell li+ battery. figure 1 is the block diagram and application circuit. sps circuitry offers flexible power distribution between an ac adapter or usb source, battery, and system load, and makes the best use of available power from the ac adapter/usb input. the battery is charged with any available power not used by the system load. if a system load peak exceeds the current limit, supple- mental current is taken from the battery. thermal limit- ing prevents overheating by reducing power drawn from the input source. two step-down dc-dc converters achieve excellent light-load efficiency and have on-chip soft-start circuit- ry; 1mhz switching frequency allows for small external components. four ldo linear regulators feature low quiescent current and operate from inputs as low as 1.7v. this allows the ldos to operate from the step- down output voltage to improve efficiency. the white led driver features easy adjustment of led brightness and open-led overvoltage protection. a 1-cell li+ charger has programmable charge current up to 1.25a and a charge timer. smart power selector (sps) sps seamlessly distributes power between the external input, the battery, and the system load (figure 2). the basic functions of sps are: with both the external power supply and battery connected: a) when the system load requirements exceed the capacity of the external power input, the battery supplies supplemental current to the load. b) when the system load requirements are less than the capacity of the external power input, the bat- tery is charged with residual power from the input. when the battery is connected and there is no external power input, the system is powered from the battery. when an external power input is connected and there is no battery, the system is powered from the external power input. a thermal-limiting circuit reduces battery-charge rate and external power-source current to prevent overheating. input limiter all regulated outputs (out1?ut7) derive their power from the sys output. with an ac adapter or usb source connected at dc, the input limiter distributes power from the external power source to the system load and battery charger. in addition to the input limiter? primary function of passing the dc power source to the system and charger loads at sys, it performs several additional functions to optimize use of available power: input voltage limiting: if the voltage at dc rises, sys limits to 5.3v, preventing an overvoltage of the system load. a dc voltage greater than 6.9v is con- sidered invalid and the input limiter disconnects the dc input entirely. the withstand voltage at dc is guaranteed to be at least 9v. a dc input is also invalid if it is less than bat, or less than the dc undervoltage threshold of 3.5v (falling). with an invalid dc input voltage, sys connects to bat through a 30m switch. input overcurrent protection: the current at dc is limited to prevent input overload. this current limit is automatically adjusted to match the capabilities of source, whether it is a 100ma or 500ma usb source, or an ac adapter. when the load exceeds the input current limit, sys drops to 100mv below bat and supplemental load current is provided by the battery. q1 input-to-sys switch q2 battery-to-sys switch (discharge path) q3 (charge path) dc sys bat ac adapter or usb input system load battery thm gnd r thm max8662 MAX8663 figure 2. smart power selector block diagram
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices ______________________________________________________________________________________ 23 thermal limiting: the input limiter includes a ther- mal-limiting circuit that reduces the current drawn from dc when the ic junction temperature increases beyond +100? in an attempt to prevent further heating. the current limit is be reduced by 5%/? for temperatures above +100?, dropping to 0ma at +120?. due to the adaptive nature of the charging circuitry, the charger current reduces to 0ma before the system load is affected by thermal limiting. adaptive battery charging: while the system is powered from dc, the charger can also draw power from sys to charge the battery. if the charg- er load plus system load exceeds the current capa- bility of the input source, an adaptive charger control loop reduces charge current to prevent the sys voltage from collapsing. maintaining a higher sys voltage improves efficiency and reduces power dissipation in the input limiter by running the switching regulators at lower current. figure 3 shows the sys voltage and its relationship to dc and bat under three conditions: a) charger is off and sys is driven from dc. b) charger is on and adaptive charger control is limiting charge current. c) the load at sys is greater than the available input current. the adaptive battery-charger circuit reduces charging current when the sys voltage drops 550mv below dc. for example, if dc is at 5v, the charge current reduces to prevent sys from dropping below 4.45v. when dc is greater than 5.55v, the adaptive charging circuitry reduces charging current when sys drops 300mv below the 5.3v sys regulation point (5.0v). finally, the circuit prevents itself from pulling sys down to within 100mv of bat. bat dc sys (charger off) sys (charger on) 550mv sys (sys overload) 5.3v 100mv 100mv 5.0v input: 500ma usb charger: riset = 4 (750ma) i(sys) x 30m i(sys) x 150ma 475ma 0ma bat charge current (charge on) 4.0v 3.9v figure 3. sys voltage and charge current vs. dc and bat voltage
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices 24 ______________________________________________________________________________________ dc input current-limit selection (pen1/pen2) the input current limit can be set to a variety of values as shown in table 1. when the pen1 input is low, a usb source is expected at dc and the current limit is set to either 95ma or 475ma by pen2. when pen1 is high, an ac adapter is expected at dc and the current limit is set based on a programming resis- tor at pset. the dc input current limit is calculated from: i dc_lim = 2000 x (1.5 / r pset ) an exception is when the battery charger is disabled ( cen high) with pen2 low, where the max8662/ MAX8663 enter usb suspend mode. power-ok output ( pok ) pok is an active-low open-drain output indicating dc status. when the voltage at dc is between the under- voltage and the overvoltage thresholds, and is greater than the bat voltage, pok pulls low to indicate that input power is ok. otherwise, pok is high impedance. pok is not affected by the states of pen1, pen2, or cen . pok remains active in thermal overload. battery charger the battery charger state diagram is illustrated in figure 4. with a valid ac adapter/usb voltage present, the bat- tery charger initiates a charge cycle when the charger cen pen1 pen2 dc input current limit expected input type charger current limit** 0 0 0 95ma 100ma usb 1556(1.5v / r iset ) 0 0 1 475ma 500ma usb 1556(1.5v / r iset ) 0 1 x* 2000(1.5v / r pset ) ac adapter 1556(1.5v / r iset ) 1 x* 0 off usb suspend off 1 0 1 475ma 500ma usb off 1 1 1 2000(1.5v / r pset ) ac adapter off table 1. dc input current and charger current-limit select *x = don? care. ** the maximum charge will not exceed the dc input current. toggle cen or remove and reconnect ac adapter/usb charger off chg = high-z i bat = 0ma temperature suspend i bat = 0ma chg = previous state any state timer > t prequal any charging state cen = 1 or remove and reconnect ac adapter/usb thermistor temperature ok timer = resumed thermistor too hot or too cold timer = resumed v bat < 2.88v set timer = 0 v bat < 3v set timer = 0 i bat > i chg-max x 12% set timer = 0 i bat < i chg-max x 7.5% and v bat = 4.2v timer = t top-off v bat = < 4.1v set timer = 0 timer > t fst-chg (timer suspended if i bat < i chg-max x 20% while v bat < 4.2v) prequalification chg = 0v i bat = i chg-max / 10 cen = 0 set timer = 0 done chg = high-z i bat = 0ma fast charge chg = 0v i bat = i chg-max top - off chg = high - z fault pok = 0v chg = blink at 1hz i bat = 0ma figure 4. charger state diagram
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices ______________________________________________________________________________________ 25 is enabled. it first detects the battery voltage. if the bat- tery voltage is less than the bat prequalification thresh- old (3.0v), the charger enters prequalification mode in which the battery charges at 10% of the maximum fast- charge current. this slow charge ensures that the bat- tery is not damaged by fast-charge current while deeply discharged. once the battery voltage rises to 3.0v, the charger transitions to fast-charge mode and applies the maximum charge current. as charging con- tinues, the battery voltage rises until it reaches the bat- tery regulation voltage (4.2v) where charge current starts tapering down. when charge current decreases to 7.5% of fast-charge current, the charger enters top- off mode. top-off charging continues for 30min, then all charging stops. if the battery voltage subsequently drops below the 4.1v recharge threshold, charging restarts and the timers reset. charge current iset adjusts the max8662/MAX8663 charging current to match the capacity of the battery. a resistor from iset to ground sets the maximum fast-charge current, the charge current in prequal, and the charge-current threshold below which the battery is considered com- pletely charged. calculate these thresholds as follows: i chg-max = 1556 x 1.5v / r iset i pre-qual = 10% x i chg-max i top-off = 7.5% x i chg-max determine the i chg-max value by considering the char- acteristics of the battery, and not the capabilities of the expected ac adapter/usb charging input, the system load, or thermal limitations of the pcb. the max8662/ MAX8663 automatically adjust the charging algorithm to accommodate these factors. in addition to setting the charge current, iset also pro- vides a means to monitor battery-charge current. the output voltage of the iset pin tracks the charge current delivered to the battery, and can be used to monitor the charge rate, as shown in figure 5. a 1.5v output indi- cates the battery is being charged at the maximum set fast-charge current; 0v indicates no charging. this volt- age is also used by the charger control circuitry to set and monitor the battery current. avoid adding more than 10pf capacitance directly to the iset pin. if filter- ing of the charge-current monitor is necessary, add a resistor of 100k or more between iset and the filter capacitor to preserve charger stability. charge timer as shown in figure 3, the max8662/MAX8663 feature a fault timer for safe charging. if prequalification charging or fast charging does not complete within the time limits, which are programmed by the timer capacitor at ct, the charger stops charging and issues a timeout fault. charging can be resumed by either toggling cen or cycling the dc input voltage. the max8662/MAX8663 support values of c ct from 0.01? to 1?: when the charger exits fast-charge mode, chg goes high impedance and top-off mode is entered. top-off time is also determined by the capacitance at ct: in fast-charge mode, the fault timer is suspended when the charge current is limited, by input or thermal limit- ing, to less than 20% of i chg-max. t c f top off ct ? = 300 0 068 min . t c f fst chg ct ? = 300 0 068 min . t c f prequal ct = 30 0 068 min . battery-charging current (a) iset voltage (v) monitoring the battery charge current with v iset 0 1556 x (1.5v/r iset ) 1.5 0 discharging v iset = r iset 1556 x i bat figure 5. monitoring the battery charge current with iset output voltage
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices 26 ______________________________________________________________________________________ connect ct to gnd to disable the prequalification and fast-charge timers, allowing the battery to charge indef- initely in top-off mode, or if other system timers are to be used to control charging. charge-enable input ( cen ) driving cen high disables the battery charger. driving cen low enables the charger when a valid source is connected at dc. cen does not affect the input limit current, except that driving cen high and pen2 low activates usb suspend mode. in many systems, there is no need for the system con- troller (typically a microprocessor) to disable the charg- er because the sps circuitry independently manages charging and adapter/battery power hand-off. in these situations, cen can be connected to ground. charge status output ( chg ) chg is an open-drain output that indicates charger sta- tus. chg is low when the battery charger is in prequali- fication or fast-charge mode. it is high impedance when the charger is done, in top-off, or disabled. the charger faults if the charging timer expires in pre- qualification or fast charge. in this state, chg pulses at 1hz to indicate that a fault occurred. battery charger thermistor input (thm) battery or ambient temperature can be monitored with a negative temperature coefficient (ntc) thermistor. charging is allowed when the thermistor temperature is within the allowable range. the charger enters a temperature suspend state when the thermistor resistance falls below 3.97k (too hot) or rises above 28.7k (too cold). this corresponds to a 0 to +50? range when using a 10k ntc thermistor with a beta of 3500. the relation of thermistor resistance to temperature is defined by the following equation: where: r t = the resistance in ohms of the thermistor at tem- perature t in celsius r 25 = the resistance in ohms of the thermistor at +25? ?= the material constant of the thermistor, which typi- cally ranges from 3000k to 5000k t = the temperature of the thermistor in ? table 2 shows temperature limits for different thermistor material constants. some designs may prefer other trip temperatures. this can usually be accommodated by connecting a resistor in series and/or in parallel with the thermistor and/or using a thermistor with different ? for example, a +45? hot threshold and 0? cold threshold can be realized by using a thermistor with a ?of 4250 and con- necting 120k in parallel. since the thermistor resis- tance near 0? is much higher than it is near +50?, a large parallel resistance lowers the cold threshold, while only slightly lowering the hot threshold. conversely, a small series resistance raises the cold threshold, while only slightly raising the hot threshold. the charger timer pauses when the thermistor resis- tance goes out of range: charging stops and the timer counters hold their state. when the temperature comes back into range, charging resumes and the counters continue from where they left off. connecting thm to gnd disables the thermistor function. rt r e t = + ? ? ? ? ? ? ? ? ? ? ? ? ? 25 1 273 1 298 thermistor ?(k) 3000 (k) 3250 (k) 3500 (k) 3750 (k) 4250 (k) resistance at +25? (k ) 1010101010 resistance at +50? (k ) 4.59 4.30 4.03 3.78 3316 resistance at 0? (k ) 25.14 27.15 29.32 31.66 36.91 nominal hot trip temperature (?) 55 53 50 49 46 nominal cold trip temperature (?) -3 -1 0 2 4.5 table 2. fault temperatures for different thermistors
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices ______________________________________________________________________________________ 27 figure 6 shows a simplified version of the thm input. ensure that the physical size of the thermistor is such that the circuit of figure 6 does not cause self-heating. step-down dc-dc converters (out1 and out2) out1 and out2 are high-efficiency, 1mhz, current-mode step-down converters with adjustable output voltage. the out1 regulator outputs 0.98v to v in at up to 1200ma while out2 outputs 0.98v to v in at up to 900ma. out1 and out2 have individual enable inputs. when enabled, the out1 and out2 gradually ramp the out- put voltage over a 1.6ms soft-start time. this soft-start eliminates input inrush current spikes. out1 and out2 can operate at a 100% duty cycle, which allows the regulators to maintain regulation at the lowest possible battery voltage. the out1 dropout volt- age is 72mv with a 600ma load and the out2 dropout voltage is 90mv with a 450ma load (does not include inductor resistance). during 100% duty-cycle operation, the high-side p-channel mosfet turns on continuously, connecting the input to the output through the inductor. step-down converter operating modes out1 and out2 can operate in either auto-pwm mode (pwm low) or forced-pwm mode (pwm high). in auto- pwm mode, out1 and out2 enter skip mode when the load current drops below a predetermined level. in skip mode, the regulator skips cycles when they are not needed, which greatly decreases quiescent current and improves efficiency at light loads. in forced-pwm mode, the converters operate with a constant 1mhz switching frequency regardless of output load. output voltage is regulated by modulating the switching duty cycle. forced-pwm mode is preferred for low-noise systems, where switching harmonics can occur only at multiples of the constant-switching frequency and are easily filtered; however, regulator operating current is greater and light-load efficiency is reduced. synchronous rectification internal n-channel synchronous rectifiers eliminate the need for external schottky diodes and improve efficiency. the synchronous rectifier turns on during the second half of each switching cycle. during this time, the volt- age across the inductor is reversed, and the inductor current ramps down. in pwm mode, the synchronous rectifier turns off at the end of the switching cycle. in gnd 10k thm gnd thermal connection vl switch open when charger disabled esd diode 55.71k 97.71k 54.43k v thm_c = 2.4v rising (typ) v thm_h = 0.9v falling (typ) v thm_d = 0.1v falling (typ) hot cold enable thm bad temp disable charger 6.43k 60mv hyst 60mv hyst 60mv hyst max8662 MAX8663 - + - + - + figure 6. thermistor input
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices 28 ______________________________________________________________________________________ skip mode, the synchronous rectifier turns off when the inductor current falls below the n-channel zero-crossing threshold or at the end of the switching cycle, whichev- er occurs first. setting out1 and out2 output voltage select an output voltage for out1 between 0.98v and v in by connecting fb1 to the center of a resistive volt- age-divider between out1 and gnd. choose r3 (figure 1) for a reasonable bias current in the resistive divider; choose r3 to be between 100k and 200k . then, r2 (figure 1) is given by: r2 = r3 ((v out1 /v fb ) - 1) where v fb = 0.98v. for out2, r4 and r5 are calculat- ed using: r4 = r5 ((v out2 /v fb ) - 1) out1 and out2 inductors 3.3? and 4.7? inductors are recommended for the out1 and out2 step-down converters. ensure that the inductor saturation current rating exceeds the peak inductor current, and the rated maximum dc inductor current exceeds the maximum output current. for lower load currents, the inductor current rating may be reduced. for most applications, use an inductor with a current rating 1.25 times the maximum required output current. for maximum efficiency, the inductor? dc resistance should be as low as possible. see table 4 for component examples. boost converter with white led driver (out3, max8662 only) the max8662 contains a boost converter, out3, which drives up to seven white leds in series at up to 30ma. the boost converter regulates its output voltage to maintain the bottom of the led stack at 320mv. a 1mhz switching rate allows for a small inductor and small input and output capacitors, while also minimizing input and output ripple. reference voltage ref is a 1.5v regulated output that is available to drive the brt input when the boost converter is enabled. this voltage can be used to control led brightness by driving brt through a resistor-divider. boost overvoltage protection (ovp) ovp limits the maximum voltage of the boost output for protection against overvoltage due to open or discon- nected leds. an external resistor between out3 and ovp, with an internal 20? pulldown current from ovp to gnd, sets the maximum boost output to: v boost_max = (r ovp x 20?) + 1.25v for example, with r ovp = 1.2m , the out3 maximum voltage is set at 25.25v. the ovp circuit also provides soft-start to reduce inrush current by ramping the inter- nal pulldown current from 0 to 20? over 1.25ms at startup. the 20? internal current is disconnected when en3 goes low. out3 can also be used as a voltage-output boost by setting r ovp for the desired output voltage. when doing this, the output filter capacitor must be at least 1?, and the compensation network should be a 0.01? capaci- tor in series with a 10k resistor from cc3 to ground. brightness control (voltage or pwm) led current is set by the voltage at brt. the v brt range for adjusting output current from 1ma to 30ma is 50mv to 1.5v. connecting brt to a 1.5v reference volt- age (such as ref) sets led current to 30ma. the en3 input can also be driven by a logic-level pwm brightness control signal, such as that supplied by a microcontroller. the allowed pwm frequency range is from 1khz to 100khz. a 100% duty cycle corresponds to full current set by the brt pin. the max8662 digitally decodes the pwm brightness signal and eliminates pwm ripple found in more common pwm brightness controls. as a result, no external filtering is needed to prevent intensity ripple at the pwm rate. in order to properly distinguish between a dc or pwm control signal, the max8662 delays turn-on from the ris- ing edge of en3, and turn-off from the falling edge of en3, by 2ms. if there are no more transitions in the en3 signal after 2ms, en3 assumes the control signal is dc and sets led brightness based on the dc level. if two ris- ing edges occur within 2ms, the circuit assumes the con- trol is pwm and sets brightness based on the duty cycle. out3 inductor for the white led driver, out3, a 22? inductor is rec- ommended for most applications. for best efficiency, the inductor? dc resistance should also be as low as possible. see table 4 for component examples. out3 compensation capacitor a compensation capacitor from cc3 to gnd ensures boost converter control stability. for white led applica- tions, connect a 0.22? ceramic capacitor from cc3 to ground when using 0.1? at out3. for oled applica- tions, connect a 0.01? capacitor in series with 10k from cc3 to ground, and a 1? out3 capacitor to improve boost output load-transient response. out3 diode selection the max8662 boost converter? high-switching fre- quency demands a high-speed rectification diode (d1)
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices ______________________________________________________________________________________ 29 for optimum efficiency. a schottky diode is recom- mended due to its fast recovery time and low forward- voltage drop. ensure the diode? peak current rating exceeds the peak inductor current. in addition, the diode? reverse breakdown voltage must exceed vout3. see table 4 for component examples. linear regulators (out4, out5, out6, and out7) the max8662/MAX8663 contain four low-dropout, low- quiescent current, low-operating voltage linear regula- tors. the maximum output currents for out4, out5, out6, and out7 are 500ma, 150ma, 300ma, and 150ma, respectively. each regulator has its own enable input. when enabled, a linear regulator soft-starts by ramping the outputs at 10v/ms. this limits inrush cur- rent when the regulators are enabled. the ldo output voltages, out4, out5, out6, and out7 are pin programmable by sl1 and sl2 (table 3). sl1 and sl2 are intended to be hardwired and cannot be driven by active logic. changes to sl1 and sl2 after power-up are ignored. vl linear regulator vl is the output of a 3.3v linear regulator that powers the on-chip input limiter and charger control circuitry. vl is powered from dc and can provide up to 10ma when a dc source is present. bypass vl to gnd with a 0.1? capacitor. regulator enable inputs (en_) the out1?ut7 regulators have individual enable inputs. drive en_ high to initiate soft-start and enable out_. drive en_ low to disable out_. when disabled, each regulator (out1?ut7) switches in an active pulldown resistor to discharge the output. soft-start/inrush current the max8662/MAX8663 implement soft-start on many levels to control inrush current and avoid collapsing source supply voltages. the input-voltage limit and bat- tery charger have a 1.5ms soft-start time. all regulators also implement soft-start. white led driver soft-start is accomplished by ramping the ovp current from 0 to 20? in 1.25ms. during soft-start, the pwm controller forces 0% switching duty cycle to avoid an input cur- rent surge at turn-on. undervoltage and overvoltage lockout dc uvlo when the dc voltage is below the dc undervoltage threshold (v uvlo_dc , typically 3.5v falling), the max8662/MAX8663 enter dc undervoltage lockout (dc uvlo). dc uvlo forces the power management cir- cuits to a known dormant state until the dc voltage is high enough to allow the device to make accurate deci- sions. in dc uvlo, q1 is open (figure 2), the charger is disabled, pok is high-z, and chg is high-z. the sys- tem load switch, q2 (figure 2) is closed in dc uvlo, allowing the battery to power the sys node. all regula- tors are allowed to operate from the battery in dc uvlo. dc ovlo when the dc voltage is above the dc overvoltage threshold (v ovlo_dc , typically 6.9v), the max8662/ MAX8663 enter dc overvoltage lockout (dc ovlo). dc ovlo mode protects the max8662/MAX8663 and downstream circuitry from high-voltage stress up to 9v. in dc ovlo, vl is on, q1 (figure 2) is open, the charg- er is disabled, pok is high-z, and chg is high-z. the system load switch q2 (figure 2) is closed in dc ovlo, allowing the battery to power sys. all regulators are allowed to operate from the battery in dc uvlo. connect sl_ to: linear regulator output voltages sl1 sl2 out4 (v) out5 (v) out6 (v) out7 (v) open circuit open circuit 3.3 3.3 3.3 3.3 ground open circuit 3.3 2.85 1.85 1.85 sys open circuit 2.85 2.85 1.85 1.85 open circuit ground 3.3 2.85 2.85 1.85 ground ground 2.5 3.3 1.5 1.5 sys ground 2.5 3.3 1.5 1.3 open circuit sys 1.2 1.8 1.1 1.3 ground sys 3.3 2.85 1.5 1.5 sys sys 1.8 2.5 3.3 2.85 table 3. sl1 and sl2, output voltage selection
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices 30 ______________________________________________________________________________________ sys uvlo when the sys voltage falls below the sys undervoltage threshold (v uvlo_sys , typically 2.4v falling), the max8662/MAX8663 enter sys undervoltage lockout (sys uvlo). sys uvlo forces all regulators off. all regulators assume the states determined by the corre- sponding enable input (en_) when the sys voltage rises above v uvlo_sys . input-limiter thermal limiting the max8662/MAX8663 reduce input-limiter current by 5%/? when its die temperature exceeds +100?. the system load (sys) has priority over charger current, so input current is first reduced by lowering charge cur- rent. if the junction temperature still reaches +120? in spite of charge-current reduction, no current is drawn from dc, the battery supplies the entire system load, and sys is regulated at 100mv below bat. note that this on-chip thermal-limiting circuitry is not related to, and operates independently from, the thermistor input. regulator thermal-overload shutdown the max8662/MAX8663 disable all charger, sys, and regulator outputs (except vl) if the junction tempera- ture rises above +165?, allowing the device to cool. when the junction temperature cools by approximately 15?, resume the state they held prior to thermal over- load. note that this on-chip thermal-protection circuitry is not related to, and operates independently from, the thermistor input. also note that thermal-overload shut- down is a fail-safe mechanism. proper thermal design should ensure that the junction temperature of the max8662/MAX8663 never exceeds the absolute maxi- mum rating of +150?. applications information step-down converters (out1 and out2) capacitor selection the input capacitor in a dc-dc converter reduces cur- rent peaks drawn from the battery or other input power source and reduces switching noise in the controller. the impedance of the input capacitor at the switching frequency should be less than the input source? output impedance so that high-frequency switching currents do not pass through the input source. the dc-dc con- verter output capacitor keeps output ripple small and ensures control-loop stability. the output capacitor must also have low impedance at the switching frequency. ceramic capacitors with x5r or x7r dielectrics are highly recommended for both input and output capaci- tors due to their small size, low esr, and small tempera- ture coefficients. see table 4 for example out1/out2 input and output capacitors and manufacturers. component function part c1 input filter capacitor 4.7f ? 10% , 16v x 5r cer am i c cap aci tor m ur ata g rm 188r61c 105ka93b or tai yo y ud en e m k107 bj105ka c2, c3 vl filter capacitor 0.1? ?0%, 10v x5r ceramic capacitor (0402) murata grm 155r61a104ka01 or tdk c1005x5r1a104k c4, c6 buck input bypass capacitors 4.7? ?0%, 6.3v x5r ceramic capacitors (0603) mutara grm188r60j475ke c5, c7 step-down output filter capacitors 2 x 10? 10%, 6.3v x5r ceramic capacitors (0805) murata grm219r60j106ke19 c8, c9 linear regulator input filter capacitors 1.0f ? 10% , 16v x 5r cer am i c cap aci tor s ( 0603) m ur ata g rm 188r61c 105ka93b or tai yo y ud en e m k107 bj105ka c10 sys output bypass capacitor 10? 10%, 6.3v x5r ceramic capacitor c11 battery bypass capacitor 4.7? ?0%, 6.3v x5r ceramic capacitor c12 charger timing capacitor 0.068? ?0%, 10v x5r ceramic capacitor (0402) tdk c1005x5r1a683k c13 boost input bypass capacitor 1.0f ? 10% , 16v x 5r cer am i c cap aci tor ( 0603) m ur ata g rm 188r61c 105ka93b or tai yo y ud en e m k107bj105ka c14 step-up output filter capacitor 0.1? ?0%, 50v x7r ceramic capacitor (0603) murata grm188r71h104ka93 or taiyo yuden umk107bj104ka c15 step-up compensation capacitor 0.22? ?0%, 10v x5r ceramic capacitor (0402) murata grm155r61a224ke19 table 4. external components list (see figure 1)
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices ______________________________________________________________________________________ 31 component function part c16 linear regulator output filter capacitor 4.7? ?0%, 6.3v x5r ceramic capacitor (0603) murata grm188r60j475ke19 c17, c19 linear regulator output filter capacitors 1.0? ?0%, 6.3v x5r ceramic capacitors (0603) murata grm188r60j105ka01 c18 linear regulator output filter capacitor 2.2? ?0%, 6.3v x5r ceramic capacitor (0603) murata grm185r60j225ke26 d1 boost rectifier 200ma, 30v schottky diode (sod-323) central cmdsh2-3 d2?8 display backlighting 30ma surface-mount white leds nichia nscw215t d9 cs clamp 100ma silicon signal diode central cmod4448 l1 out1 step-down inductor 3.3? inductor toko de2818c 1072as-3r3m, 1.6a, 50m l2 out2 step-down inductor 4.7? inductor toko de2818c 1072as-4r7m, 1.3a, 70m l3 out3 step-up inductor 22? inductor murata lqh32cn220k53, 250ma, 0.71 dcr (3.2mm x 2.5mm x 1.55mm) or tdk vlf3012at-220mr33, 330ma, 0.76 dcr (2.8mm x 2.6mm x 1.2mm ) r1, r7 logic output pullup resistors 100k r2r5 step-down feedback resistors r3 and r5 are 200k ?.1%; r2 and r4 depend on output voltage (?.1%) r6 negative tc thermistor phillips ntc thermistor p/n 2322-640-63103 10k ?% at +25? r8 input current-limit programming resistor 1.5k ?%, for 2a limit r9 fast charge-current programming resistor 3k ?%, for 777ma charging r10 step-up overvoltage feedback resistor 1.2m ?%, for 25v max output table 4. external components list (see figure 1) (continued)
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices 32 ______________________________________________________________________________________ power dissipation the max8662/MAX8663 have a thermal-limiting circuitry, as well as a shutdown feature to protect the ic from damage when the die temperature rises. to allow the maximum charging current and load current on each regulator, and to prevent thermal overload, it is important to ensure that the heat generated by the max8662/MAX8663 is dissipated into the pcb. the package? exposed paddle must be soldered to the pcb, with multiple vias tightly packed under the exposed paddle to ensure optimum thermal contact to the ground plane. table 5 shows the thermal characteristics of the max8662/MAX8663 packages. for example, the junc- tion-to-case thermal resistance ( jc ) of the MAX8663 is 2.7?/w. when properly mounted on a multilayer pcb, the junction-to-ambient thermal resistance ( ja ) is typi- cally 28?/w. pcb layout and routing high switching frequencies and relatively large peak currents make the pcb layout a very important aspect of design. good design minimizes ground bounce, exces- sive emi on the feedback paths, and voltage gradients in the ground plane, which can result in instability or regulation errors. a separate low-noise analog ground plane containing the reference, linear regulator, signal ground, and gnd must connect to the power-ground plane at only one point to minimize the effects of power-ground currents. pgnd_, dc power, and battery grounds must connect directly to the power-ground plane. connect gnd to the exposed paddle directly under the ic. use multiple tightly spaced vias to the ground plane under the exposed paddle to help cool the ic. position input capacitors from dc, sys, bat, pv1, and pv2 to the power-ground plane as close as possible to the ic. connect input capacitors and output capacitors from inputs of linear regulators to low-noise analog ground as close as possible to the ic. connect the inductors, output capacitors, and feedback resistors as close to the ic as possible and keep the traces short, direct, and wide. refer to the max8662/MAX8663 evaluation kit for a suitable pcb layout example. MAX8663 thin qfn (5mm x 5mm) top view 35 36 34 33 12 11 13 pen2 dc2 sys1 sys2 bat1 14 pen1 pv2 pv1 lx1 lx2 pg2 en2 pg1 en1 12 in67 4567 27 28 29 30 26 24 23 22 out7 vl en4 out5 in45 out4 dc1 fb2 3 25 37 sl1 gnd 38 39 40 sl2 pset pok ct iset thm out6 32 15 en5 en7 31 16 17 18 19 20 pwm bat2 chg cen fb1 8910 21 en6 pin configurations (continued) 48-pin thin qfn (6mm x 6mm) 40-pin thin qfn (5mm x 5mm) single-layer pcb multilayer pcb single-layer pcb multilayer pcb continuous power dissipation 2105.3mw derate 26.3mw/? above +70? 2963.0mw derate 37.0mw/? above +70? 1777.8mw derate 22.2mw/? above +70? 2857.1mw derate 35.7mw/? above +70? ja 38?/w 27?/w 45?/w 28?/w jc 1.4?/w 1.4?/w 1.7?/w 1.7?/w table 5. max8662/MAX8663 package thermal characteristics
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices ______________________________________________________________________________________ 33 package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .) qfn thin.eps
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices 34 ______________________________________________________________________________________ package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .)
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices ______________________________________________________________________________________ 35 package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .) qfn thin.eps
max8662/MAX8663 power-management ics for single-cell, li+ battery-operated devices maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 36 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2007 maxim integrated products is a registered trademark of maxim integrated products. inc. reduta package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation go to www.maxim-ic.com/packages .)

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