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MP2116 2a, 6v, 100% duty cy cle synchronous step-down converter with 0.5a ldo MP2116 rev.1.0 www.monolithicpower.com 1 1/17/2013 mps proprie tary information. patent protected. unauthorized photocopy and duplication ? 2013 mps. all rights reserved. the future of analog ic technology description the MP2116 is an internally compensated 1.25mhz, 2a synchronous step-down switching dc-dc converter plus a standalone low-input voltage, 0.5a low dropout (ldo) linear regulator. it is ideal for powering portable equipment that operates from a single cell lithium-ion (li+) battery. the MP2116 can provide up to 2a to the switcher output, and 0.5a load current to the ldo output from a 2.5v to 6v input voltage. both output voltages can be regulated as low as 0.6v. the 2a synchronous switcher features integrated high-side and low-side switch for high efficiency and small footprint. with peak current mode control and internal compensation, the MP2116 is stable with ceramic capacitors. fault condition protection includes cycle-by- cycle current limiting and thermal shutdown. the standalone low-input voltage 0.5a ldo is used to power noise sensitive circuitry. the ldo?s separate input supply pin (in2) can be connected to the switcher output to reduce power dissipation and noise from the main switcher. MP2116 is available in the small 10-pin 3mmx3mm qfn package. features ? 100% duty cycle low dropout operation (high-side pfet) ? 2a switcher output current at v in =3v ? internal power mosfet switches ? stable with ceramic capacitors ? up to 95% efficiency for switcher ? 1.25mhz switching frequency ? internal soft-start for switcher ? 2.5v to 6v input range, for switcher ? 1v to v in1 input range, for ldo ? 0.5a ldo output current ? 1 a shutdown current ? thermal shutdown ? cycle-by-cycle over current protection ? short circuit protection ? power ok output ? available in 10-pin qfn package applications ? dvd+/-rw drives ? smart phones ? pdas ? digital cameras ? portable instruments all mps parts are lead-free and adhere to the rohs directive. for mps green status, please visit mps website under products, quality assurance page. ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. typical application MP2116 fb1 en1 in1 sw1 in2 5 9 8 7 10 1 2 3 4 6 fb2 en2 pwrok out2 gnd out2 1.2v @ 0.5 a power ok *out1 1.8v @ 1.5a r1 499k r2 249k r3 60k r4 60k r5 500k c o2 4.7 f c in1 10 f l * i out 1+i out 2=2a c o1 22 f off on v in 2.5v - 6v c in2 2.2 f 100 90 80 70 60 50 40 30 20 10 0 10 100 10000 1000 load current (ma) efficiency vs load current efficiency (%) v in =3.3v v out =1.8v v in =5.0v v in =4.0v free datasheet http:///
MP2116 ?2a, 6v, 100% duty cycle synchroous step-down converter with 0.5a ldo MP2116 rev.1.0 www.monolithicpower.com 2 1/17/2013 mps proprie tary information. patent protected. unauthorized photocopy and duplication ? 2013 mps. all rights reserved. ordering information part number* package top marking temperature MP2116dq qfn10 (3mm x 3mm) p4 ?40 c to +85 c for tape & reel, add suffix ?z (eg. MP2116dq?z) for lead free, add suffix ?lf (eg. MP2116dq?lf?z) package reference 1 2 3 4 5 10 9 8 7 6 absolute maxi mum ratings (1) in1, out1/2 to gnd..................?0.3v to + 6.5v in2 to gnd .........................?0.3v to v in1 + 0.3v sw1 to gnd .......................?0.3v to v in1 + 0.3v ...........(-2.5v MP2116 ?2a, 6v, 100% duty cycle synchroous step-down converter with 0.5a ldo MP2116 rev.1.0 www.monolithicpower.com 3 1/17/2013 mps proprie tary information. patent protected. unauthorized photocopy and duplication ? 2013 mps. all rights reserved. electrical characteristics (5) v in1/2 = v en1/2 = 3.6v, t a = +25 c, unless otherwise noted. parameters condition min typ max units v in1/2 = 3.6v, v en1 =3.6v, v en2 =0v v fb1 = 0.58v 300 500 no load supply current v in1/2 = 3.6v, v en1 =0v, v en2 =3.6v v fb2 = 0.62v 70 120 a shutdown current v en1/2 = 0v, v in1/2 = 6v 0.01 1 a thermal shutdown trip threshol d hysteresis = 20c 150 c pwrok upper trip threshold fb1/2 with respect to the nominal value 10 % pwrok lower trip threshold fb1/2 with respect to the nominal value ?10 % pwrok output lower voltage i sink = 5ma 0.3 v pwrok deglitch timer (fb1) switching regulator 50 pwrok deglitch timer (fb2) ldo 150 s en1/2 trip threshold ?40c t a +85c 0.3 0.96 1.5 v en1/2 pull down resistor 1 m ? switching regulator in1 under voltage lockout threshold risi ng edge, hysteresis=0 .3v 1.90 2.15 2.40 v t a = +25c 0.588 0.600 0.612 regulated fb1voltage ?40c t a +85c 0.582 0.600 0.618 v fb1 input bias current v fb1 = 0.62v ?50 ?2 +50 na sw1 pfet on resistance i sw1 = 100ma 0.20 ? sw1 nfet on resistance i sw1 = ?100ma 0.15 ? sw1 leakage current v en = 0v, v in = 6v v sw = 0v or 6v ?5 +5 a sw1 pfet peak current limit duty cycle = 100%, current pulse width < 1ms 2.2 3.1 4.0 a oscillator frequency 1.00 1.25 1.50 mhz linear regulator ldo in2 input range i load2 = 10ma, v out2 =v fb2 1 v in1 v t a = +25c 0.588 0.600 0.612 regulated fb2 voltage ?40c t a +85c 0.582 0.600 0.618 v fb2 input bias current v fb2 = 0.6v ?50 ?2 +50 na out2 maximum output current v out2 = 1.2v 500 - ma out2 current limit v out2 = 0v 600 700 ma dropout voltage i load = 0.15a, v out2 = 1.2v 100 mv notes: 5) production test at +25c. specificat ions over the temperature range are guaranteed by design and characterization. free datasheet http:///
MP2116 ?2a, 6v, 100% duty cycle synchroous step-down converter with 0.5a ldo MP2116 rev.1.0 www.monolithicpower.com 4 1/17/2013 mps proprie tary information. patent protected. unauthorized photocopy and duplication ? 2013 mps. all rights reserved. pin functions pin # name description 1 fb1 feedback input for the switcher output vout1. 2 en1 enable input for the switcher. 3 in1 main input supply pin. input supply for bot h the switcher and the low dropout (ldo) linear regulator, except the ldo output power device. 4 sw1 switch node of the switcher. 5 gnd (exposed pad) ground. exposed pad must be connected to gnd pin. 6 in2 input supply for the linear regulator ldo output power device. bypass with a 2.2uf from in2 to gnd. 7 out2 output of the 500ma ldo. the ldo is desig ned to be stable with an external 4.7f ceramic capacitor (minimum). 8 pwrok power ok open drain output. high output indicates that both outputs are within 10% of the regulation value. low output i ndicates that the output is out of 10% window. pwrok is pulled down in shutdown. the pwrok window comparators have 50 s deglitch timer for the switcher and 150s deglitch timer for the linear regulator ldo to avoid false trigger during load transient. 9 en2 enable input for the low-dropout ldo 10 fb2 feedback input for the ldo output vout2. free datasheet http:///
MP2116 ?2a, 6v, 100% duty cycle synchroous step-down converter with 0.5a ldo MP2116 rev.1.0 www.monolithicpower.com 5 1/17/2013 mps proprie tary information. patent protected. unauthorized photocopy and duplication ? 2013 mps. all rights reserved. typical performanc e characteristics v in =3.6v, v out1 =1.8v, v out2 =1.2v, c in1 =10uf, c o1 =22uf, c in2 =2.2uf, c o2 =4.7uf, l=1uh, t a =25oc, unless otherwise noted. switcher output voltage vs load current switcher output voltage vs input voltage switcher output voltage vs input voltage switcher output voltage vs load current switcher efficiency vs load current switcher efficiency vs load current switcher efficiency vs load current v in =2.5v v in =3.3v v in =4.0v v in =5.0v v out1 =1.2v v in =3.3v v out1 =1.8v v out1 =3.3v v in =5.0v v in =5.0v v in =4.0v v in =4.0v v in =3.3v v in =5.0v v in =2.5v v in =4.0v i out =0.1a i out =0ma i out =0.1a i out =0ma i out =0ma v in =5.0v v in =4.0v v in =3.3v v in =5.0v v in =3.3v i out =0.1a free datasheet http:///
MP2116 ?2a, 6v, 100% duty cycle synchroous step-down converter with 0.5a ldo MP2116 rev.1.0 www.monolithicpower.com 6 1/17/2013 mps proprie tary information. patent protected. unauthorized photocopy and duplication ? 2013 mps. all rights reserved. typical performanc e characteristics v in =3.6v, v out1 =1.8v, v out2 =1.2v, c in1 =10uf, c o1 =22uf, c in2 =2.2uf, c o2 =4.7uf, l=1uh, t a =25oc, unless otherwise noted. peak current vs duty cycle enable turn on enable turn off v out2 (v) v out2 (v) v out2 (v) 1.802 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0 1.801 1.800 1.799 1.798 1.797 ldo dropout (v) 1.23 1.22 1.21 1.20 1.19 1.18 1.203 1.202 1.201 1.200 1.199 1.198 i out =0.2a i out =0.2a i out =0.1a i out =0.1a pwrok 2v/div v out1 2v/div v out2 2v/div v en 2v/div pwrok 2v/div v out1 2v/div v out2 2v/div v en 2v/div v in2 =2v v in2 =3v v in2 =2.5v v in2 =3.0v free datasheet http:///
MP2116 ?2a, 6v, 100% duty cycle synchroous step-down converter with 0.5a ldo MP2116 rev.1.0 www.monolithicpower.com 7 1/17/2013 mps proprie tary information. patent protected. unauthorized photocopy and duplication ? 2013 mps. all rights reserved. typical performanc e characteristics v in =3.6v, v out1 =1.8v, v out2 =1.2v, c in1 =10uf, c o1 =22uf, c in2 =2.2uf, c o2 =4.7uf, l=1uh, t a =25oc, unless otherwise noted. free datasheet http:///
MP2116 ?2a, 6v, 100% duty cycle synchroous step-down converter with 0.5a ldo MP2116 rev.1.0 www.monolithicpower.com 8 1/17/2013 mps proprie tary information. patent protected. unauthorized photocopy and duplication ? 2013 mps. all rights reserved. typical performanc e characteristics v in =3.6v, v out1 =1.8v, v out2 =1.2v, c in1 =10uf, c o1 =22uf, c in2 =2.2uf, c o2 =4.7uf, l=1uh, t a =25oc, unless otherwise noted. 1.5 1.4 1.3 1.2 1.1 1 2.5 2.3 2.1 1.9 1.7 1.5 -50 -10 70 110 150 30 -50 -10 70 110 150 30 -50 -10 70 110 150 30 uvlo (v) frequency (mhz) v fb1 v fb2 d=100% free datasheet http:///
MP2116 ?2a, 6v, 100% duty cycle synchroous step-down converter with 0.5a ldo MP2116 rev.1.0 www.monolithicpower.com 9 1/17/2013 mps proprie tary information. patent protected. unauthorized photocopy and duplication ? 2013 mps. all rights reserved. operation in1 fb1 fb2 gnd in2 out2 pwrok sw1 + + -- pwmcmp pwm osc + -- eamp1 ics 0.6v fb1/2 0.66v out_hi eao2 out_lo bias & voltage reference 1.25mhz oscillator iamp 10x current sense amp dh dl + -- main switch (pch) synchronous rectifier (nch) + -- power on reset window comparators no good -- + 0.54v -- + figure1 D MP2116 functional block diagramm the MP2116 is a 1.25mhz current mode 2a synchronous step-down switcher plus a low input 0.5a low dropout (ldo) linear regulator (see figure1). the MP2116 is optimized for low voltage, li-ion battery powered applications where high efficiency and small size are critical. the MP2116 uses an external resistor divider to set both the switcher and ldo output voltage from 0.6v to 6v. 2a synchronous step-down switcher the switcher integrates both a main switch and a synchronous rectifier, which provides high efficiency and eliminates an external schottky diode. the duty cycle d of a step-down switcher is defined as: % 100 v v % 100 f t d in out osc on = where t on is the main switch on time and f osc is the oscillator frequency (1.25mhz). free datasheet http:///
MP2116 ?2a, 6v, 100% duty cycle synchroous step-down converter with 0.5a ldo MP2116 rev.1.0 www.monolithicpower.com 10 1/17/2013 mps proprie tary information. patent protected. unauthorized photocopy and duplication ? 2013 mps. all rights reserved. current mode pwm control slope compensated current mode pwm control provides stable switching and cycle-by-cycle current limiting for superior load and line response in addition to protection of the internal main switch and synchronous rectifier. the MP2116 switches at a constant frequency (1.25mhz) and regulates the output voltage. during each cycle the pwm comparator modulates the power transferred to the load by changing the inductor peak current based on the feedback error voltage. during normal operation, the main switch is turned on for a certain time to ramp the inductor current at each rising edge of the internal oscillator, and switched off when the peak inductor current is above the error voltage. when the main switch is off, the synchronous rectifier will be turned on immediately and stay on until the next cycle starts. dropout operation the MP2116 allows the main switch to remain on for more than one switching cycle and increases the duty cycle while the input voltage is dropping close to the output voltage. when the duty cycle reaches 100%, the main switch is held on continuously to deliver current to the output up to the pfet current limit. the output voltage then becomes the input voltage minus the voltage drop across the main switch and the inductor. short circuit protection when the output is shorted to ground, the oscillator frequency is reduced to prevent the inductor current from increasing beyond the pfet current limit. the pfet current limit is also reduced to lower the short circuit current. the frequency and current limit will return to the normal values once the short circuit condition is removed and the feedback voltage reaches 0.6v. maximum switcher output current the MP2116 switcher can provide up to 2a output current, and operate down to 3v input voltage; however the maximum output current decreases at lower input voltage due to a large ir drop on the main switch and synchronous rectifier. the slope compensation signal reduces the peak inductor current as a function of the duty cycle to prevent sub-harmonic oscillations at duty cycles greater than 50%. conversely, the current limit increases as the duty cycle decreases power ok the MP2116 provides an open-drain pwrok output that goes high after both channels reach regulation during startup. pwrok goes low after one of the output channels goes out of regulation by 10% or when device enters shutdown. there are deglitch timers built in to avoid pwrok false triggered during load transient: 50s for the switcher and 150s for the ldo. low input 0.5a linear regulator the low input 0.5a low dropout (ldo) linear regulator has separate input in2 and output out2 pins for the internal power pnp device. the control circuitry of the ldo takes power from the main input supply in1. both in1 and in2 input supplies must be presented for the ldo working properly. the ldo power device input in2 can be connected to the switcher output (figure1) or directly to the main supply in1 (figure3). if the in2 tied to the in1, it is optional to insert a rc filter between in1 and in2. the rc filter will reduce switching noise coupling from in1 to in2 and power dissipation inside the MP2116 free datasheet http:///
MP2116 ?2a, 6v, 100% duty cycle synchroous step-down converter with 0.5a ldo MP2116 rev.1.0 www.monolithicpower.com 11 1/17/2013 mps proprie tary information. patent protected. unauthorized photocopy and duplication ? 2013 mps. all rights reserved. application information output voltage setting the external resistor divider sets the output voltage. the feedback resistor r1 of the switcher also sets the feedback loop bandwidth with the internal compensation capacitor (see figure1). choose r1 feedback resistor of the switcher between 450k ? and 800k ? for optimal transient response. r2 is then given by: out1 r1 r2 v 1 0.6v = ? see table1 for recommended r1 & r2 resistor values. choose r4 of the ldo between 10k ? and 100k ? . r3 is then given by: out2 v r3 r4 ( 1) 0.6v = ? table 1?resistor selection vs. output voltage setting v out r1 r2 1.2v 499k ? (1%) 499k ? (1%) 1.5v 499k ? (1%) 332k ? (1%) 1.8v 499k ? (1%) 249k ? (1%) 2.5v 499k ? (1%) 158k ? (1%) inductor selection a 1 h to 10 h inductor with dc current rating at least 25% higher than the maximum load current is recommended for most applications. for best efficiency, the inductor dc resistance shall be <100m ? . see table 2 for recommended inductors and manufacturers. for most designs, the inductance value can be derived from the following equation: () osc l in out in out f i v v v v l ? = where i l is inductor ripple current. choose inductor ripple current approximately 30% of the maximum load current, up to 2a. the maximum inductor peak current is: l l(max) load(max) i ii 2 =+ switcher input capacitor c in1 selection the input capacitor reduces the surge current drawn from the input and switching noise from the device. the input capacitor impedance at the switching frequency shall be less than input source impedance to prevent high frequency switching current passing to the input. ceramic capacitors with x5r or x7r dielectrics are highly recommended because of their low esr and small temperature coefficients. for most applications, a 10 f~22 f capacitor is sufficient. switcher output capacitor c o1 selection the output capacitor keeps output voltage ripple small and ensures regulation loop stable. the output capacitor impedance shall be low at the switching frequency. ceramic capacitors with x5r or x7r dielectrics are recommended. for most applications, a 22 f~47 f capacitor is sufficient. the output ripple v out is approximately: ( ) out1 in1 out1 out1 in1 osc osc o1 vvv 1 v esr vf l 8f c ? ?? ? + ?? ?? table 2?suggested surface mount inductors manufacturer part number inductance (uh) max dcr (m ? ) saturation current (a) dimensions l x w x h (mm3) toko d62lcb 1.0 17 3.5 6.2 x6.3 x 2.0 sumida cdrh4d28c 1.0 17.5 3.0 5.1 x 5.1 x 3 delta sil525-1r0 1.0 38 3.2 5.0 x 5.0 x 2.5 free datasheet http:///
MP2116 ?2a, 6v, 100% duty cycle synchroous step-down converter with 0.5a ldo MP2116 rev.1.0 www.monolithicpower.com 12 1/17/2013 mps proprie tary information. patent protected. unauthorized photocopy and duplication ? 2013 mps. all rights reserved. thermal dissipation power dissipation shall be considered when both channels of the MP2116 provide maximum 2a switcher output current and 0.5a ldo output current to the loads at high ambient temperature. if the junction temperature rises above 150 c, the MP2116 two channels will be shut down. the junction-to-ambient thermal resistance of the 10-pin qfn (3mm x 3mm) r ja is 50 c/w. the maximum power dissipation is about 1.6w when the MP2116 is operating in a 70 c ambient temperature environment. w 6 . 1 w / c 50 c 70 c 150 pd o o o max = ? = pc board layout the high current paths (gnd, in1/in2 and sw1) should be placed very close to the device with short, direct and wide traces. input capacitors should be placed as close as possible to the respective in and gnd pins. the external feedback resistors shall be placed next to the fb pins. keep the switching nodes sw1 short and away from the feedback network typical application circuits MP2116 fb1 en1 in1 sw1 in2 5 9 8 7 10 1 2 3 4 6 fb2 en2 pwrok out2 gnd out2 optional power ok free datasheet http:///
MP2116 ?2a, 6v, 100% duty cycle synchroous step-down converter with 0.5a ldo notice: the information in this document is subject to change wi thout notice. please contact m ps for current specifications. users should warrant and guarantee that third party intellectual property rights ar e not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. MP2116 rev.1.0 www.monolithicpower.com 13 1/17/2013 mps proprie tary information. patent protected. unauthorized photocopy and duplication ? 2013 mps. all rights reserved. package information (3mmx3mm) qfn10 free datasheet http:///

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