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rt9198/a 1 ds9198/a-10 november 2006 www.richtek.com 300ma, low noise, ultra-fast cmos ldo regulator general description the rt9198/a is designed for portable rf and wireless applications with demanding performance and space requirements. the rt9198/a performance is optimized for battery-powered systems to deliver ultra low noise and low quiescent current. regulator ground current increases only slightly in dropout, further prolonging the battery life. the rt9198/a also works with low-esr ceramic capacitors, reducing the amount of board space necessary for power applications, critical in hand-held wireless devices. the rt9198/a consumes less than 0.01 a in shutdown mode and has fast turn-on time less than 50 s. the other features include ultra low dropout voltage, high output accuracy, current limiting protection, and high ripple rejection ratio. available in the sot-23-3, sot-23-5, sc-70-5, sc-82 and wdfn-6l 2x2 packages, the rt9198/ a also offers a range from 1.5v to 5.0v with 0.1v per step. applications z cdma/gsm cellular handsets z battery-powered equipment z laptop, palmtops, notebook computers z hand-held instruments z pcmcia cards z portable information appliances ordering information features z z z z z low-noise for rf application z z z z z fast response in line/load transient z z z z z quick start-up (typically 50 s) z z z z z < 0.01 a standby current when shutdown z z z z z low dropout : 220mv @ 300m a z z z z z wide operating voltage ranges : 2.5v to 5.5v z z z z z ttl-logic-controlled shutdown input z z z z z low temperature coefficient z z z z z current limiting protection z z z z z thermal shutdown protection z z z z z only 1 f output capacitor required for stability z z z z z high power supply rejection ratio z z z z z custom voltage available z z z z z rohs compliant and 100% lead (pb)-free note : richtek pb-free and green products are : ` rohs compliant and compatible with the current require- ments of ipc/jedec j-std-020. ` suitable for use in snpb or pb-free soldering processes. ` 100% matte tin (sn) plating. marking information for marking information, contact our sales representative directly or through a richtek distributor located in your area, otherwise visit our website for detail. rt9198/a- package type u5 : sc-70-5 u5r : sc-70-5 (r-type) y : sc-82 v : sot-23-3 b : sot- 23-5 br : sot- 23-5 (r-type) qw : wdfn-6l 2x2 (w-type) operating temperature range p : pb free with commercial standard g : green (halogen free with commer- cial standard) output voltage 15 : 1.5v 16 : 1.6v : 49 : 4.9v 50 : 5.0v 1h : 1.85v 2h : 2.85v 4g : 4.75v chip enable function (active low) chip enable function (active high)
rt9198/a 2 ds9198/a-10 november 2006 www.richtek.com typical application circuit pin configurations (top view) vin gnd vout rt9198 c out 1uf c in 1uf v in v out en chip enable on off vin gnd vout rt9198a c out 1uf c in 1uf v in v out chip enable off on en sot-23-5 /sc-70-5 (r-type) vin gnd nc vout 2 3 5 4 1 en/en sot-23-5 /sc-70-5 nc vout vin gnd 2 3 5 4 1 en/en wdfn-6l 2x2 gnd nc nc vout vin 5 4 1 2 3 6 en/en gnd note : there is no pin1 indicator on top mark fo r sc-82 type, and pin 1 will be lower left pin when reading top mark from left to right. pin2 of sc-82 is wider than other pins. sot-23-3 1 2 3 gnd vout vin sc-82 gnd vin vout 4 1 3 2 en/en
rt9198/a 3 ds9198/a-10 november 2006 www.richtek.com function block diagram functional pin description pin name pin function en chip enable (active high). note that this pin is high impedance. there should be a pull low 100k resistor connected to gnd when the control signal is floating. en chip enable (active low). note that this pin is high impedance. there should be a pull high 100k resistor connected to vin when the control signal is floating. nc no internal connect. gnd, exposed pad ground. exposed pad should be soldered to pcb board and connected to gnd. vout output voltage. vin input voltage. current-limit and thermal protection mos driver + - vout shutdown and logic control vin error amplifier v ref gnd en/en
rt9198/a 4 ds9198/a-10 november 2006 www.richtek.com absolute maximum ratings (note 1) z supply input v oltage ------------------------------------------------------------------------------------------------------ 6v z power dissipation, p d @ t a = 25 c sot-23-3/sot-23-5 ------------------------------------------------------------------------------------------------------- 400mw sc-70-5, sc-82 ------------------------------------------------------------------------------------------------------------ 300mw wdfn-6l 2x2 -------------------------------------------------------------------------------------------------------------- 606mw z package thermal resistance (note 4) sot-23-3/sot-23-5, ja ------------------------------------------------------------------------------------------------- 250 c/w sc-70-5, sc-82, ja ------------------------------------------------------------------------------------------------------ 333 c/w wdfn-6l 2x2, ja --------------------------------------------------------------------------------------------------------- 165 c/w wdfn-6l 2x2, jc -------------------------------------------------------------------------------------------------------- 20 c/w z junction temperature ----------------------------------------------------------------------------------------------------- 150 c z lead temperature (soldering, 10 se c.) ------------------------------------------------------------------------------- 260 c z storage temperature range -------------------------------------------------------------------------------------------- ? 65 c to 150 c z esd susceptibility (note 2) hbm (human body mode) ---------------------------------------------------------------------------------------------- 2kv mm (ma chine mode) ------------------------------------------------------------------------------------------------------ 200v electrical characteristics (v in = v out + 1v, c in = c out = 1 f, t a = 25 c, unless otherwise specified) parameter symbol test conditions min typ max units output voltage accuracy v out i out = 1ma ? 2 -- +2 % current limit i lim r load = 1 360 400 -- ma quiescent current i q rt9198, v en R 1.2v, i out = 0ma rt9198a, v en Q 0.4v, i out = 0ma -- 90 130 a i out = 200ma -- 170 200 dropout voltage (note 5) v drop i out = 300ma -- 220 330 mv line regulation v line v in = (v out + 1v) to 5.5v, i out = 1ma -- -- 0.3 % load regulation v load 1ma < i out < 300ma -- -- 0.6 % shutdown current i shdn rt9198, v en = gnd, shutdown rt9198a, v en = v in , shutdown -- 0.01 1 a en input bias current i iben v en = gnd or v in -- 0 100 na logic-low voltage v il rt9198, v in = 3v to 5.5v, shutdown rt9198a, v in = 3v to 5.5v, enable -- -- 0.4 en threshold logic-high voltage v ih rt9198, v in = 3v to 5.5v, enable rt9198a, v in = 3v to 5.5v, shutdown 1.2 -- -- v recommended operating conditions (note 3) z supply input v oltage ------------------------------------------------------------------------------------------------------ 2.5v to 5.5v z en input v oltage ----------------------------------------------------------------------------------------------------------- 0v t o 5.5v z junction temperature range -------------------------------------------------------------------------------------------- ? 40 c to 125 c z ambient temperature range -------------------------------------------------------------------------------------------- ? 40 c to 85 c to be continued
rt9198/a 5 ds9198/a-10 november 2006 www.richtek.com note 1. stresses listed as the above "absolute maximum ratings" may cause permanent damage to the device. these are for stress ratings. functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability. note 2. devices are esd sensitive. handling precaution recommended. note 3. the device is not guaranteed to function outside its operating conditions. note 4. ja is measured in the natural convection at t a = 25 c on a low effective single layers thermal conductivity test board of jedec 51-3 thermal measurement standard. the case point of jc is on the exposed pad for the package. note 5. the dropout voltage is defined as v in -v out , which is measured when v out is v out(normal) ? 100mv. parameter symbol test conditions min typ max units f = 100hz -- ? 60 -- power supply rejection rate f = 10khz psrr c out = 1 f, i out = 100ma -- ? 30 -- db thermal shutdown temperature t sd -- 165 -- c thermal shutdown temperature hysteresis t sd -- 30 -- c
rt9198/a 6 ds9198/a-10 november 2006 www.richtek.com typical operating characteristics psrr -80 -60 -40 -20 0 20 0.01 0.1 1 10 100 1000 frequency (khz) psrr (db) v out = 2.5v i load = 10ma i load = 100ma c in = c out = 1uf , x7r 10 100 1k 10k 100k 1m (hz) current limit vs. input voltage 300 350 400 450 500 550 600 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 input voltage (v) current limit (ma) rt9198/a-15 c in = c out = 1uf quiesent current vs. temperature 60 65 70 75 80 85 90 95 100 -50 -25 0 25 50 75 100 125 temperature quiescent current (ua) ( c) rt9198/a-15 v in = 3.3v c in = c out = 1uf output voltage vs. temperature 1.6 1.7 1.8 1.9 2 -50 -25 0 25 50 75 100 125 temperature output voltage (v) ( c) v in = 5v c in = c out = 1uf no load dropout voltage vs. load current 0 50 100 150 200 250 300 0 0.05 0.1 0.15 0.2 0.25 0.3 load current (a) dropout voltage (mv) rt9198/a-33 c in = c out = 1uf t j = 125 c t j = 25 c t j = -40 c en pin shutdown threshold vs. temperature 0.25 0.5 0.75 1 1.25 1.5 -50 -25 0 25 50 75 100 125 temperature en pin threshold voltage (v) ( c) rt9198/a-15 v in = 3.3v c in = c out = 1uf
rt9198/a 7 ds9198/a-10 november 2006 www.richtek.com time (100 s/div) c in = c out = 1uf line transient response output voltage deviation (mv) input voltage deviation (v) i load = 50ma 5 4 3 20 0 -20 time (100 s/div) v in = 3.3v c in = c out = 1uf load transient response output voltage deviation (mv) load current (ma) v out = 1.5v i load = 1ma to 50ma 100 50 0 50 0 -50 time (100 s/div) v in = 3.3v c in = c out = 1uf load transient response output voltage deviation (mv) load current (ma) v out = 1.5v i load = 1ma to 250ma 400 200 0 50 0 -50 time (100 s/div) c in = c out = 1uf line transient response output voltage deviation (mv) input voltage deviation (v) i load = 250ma 5 4 3 50 0 -50 time (1ms/div) rt9198-18, v in = 5v c in = c out = 1uf en pin shutdown response en pin voltage (v) output voltage (v) v out = 1.8v i load = 1ma 10 5 0 2 1 0 time (10 s/div) rt9198-18, v in = 5v c in = c out = 1uf start up en pin voltage (v) output voltage (v) v out = 1.8v i load = 1ma 10 5 0 2 1 0
rt9198/a 8 ds9198/a-10 november 2006 www.richtek.com time (5ms/div) v in = 4.5v c in = c out = 1uf noise noise ( v) v out = 1.8v i load = 150ma 400 200 0 -200 -400 f = 10hz to 100khz time (5ms/div) v in = 4.5v c in = c out = 1uf noise noise ( v) v out = 1.8v no load 400 200 0 -200 -400 f = 10hz to 100khz
rt9198/a 9 ds9198/a-10 november 2006 www.richtek.com applications information like any low-dropout regulator, the external capacitors used for the rt9198/a must be carefully selected for regulator stability and performance. using a capacitor whose value is > 1 f on the rt9198/a input and the amount of capacitance can be increased without limit. the input capacitor must be located a distance of not more than 0.5 inch from the input pin of the ic and returned to a clean analog ground. any good quality ceramic or tantalum can be used for this capacitor. the capacitor with larger value and lower esr (equivalent series resistance) provides better psrr and line-transient response. the output capacitor must meet both requirements for minimum amount of capacitance and esr in all ldos application. the rt9198/a is designed specifically to work with low esr ceramic output capacitor in space-saving and performance consideration. using a ceramic capacitor whose value is at least 1 f with esr is more than 20m on the rt9198/a output ensures stability. the rt9198/a still works well with output capacitor of other types due to the wide stable esr range. figure 1. shows the curves of allowable esr range as a function of load current for various output capacitor values. output capacitor of larger capacitance can reduce noise and improve load transient response, stability, and psrr. the output capacitor should be located with in 0.5 inch from the v out pin of the rt9198/a and returned to a clean analog ground. thermal considerations thermal protection limits power dissipation in rt9198/a. when the operating junction temperature exceeds 165 c, the otp circuit starts the thermal shutdown function and turns the pass element off. the pass element turns on again after the junction temperature cools by 30 c. for continuous operation, do not exceed absolute maximum operatiog junction temperature 125 c. the power dissipation definition in device is shown as following formula : p d = (v in ? v out ) x i out + v in x i q the maximum power dissipation depends on the thermal resistance of ic package, pcb layout, the rate of surroundings airflow and temperature difference between junction to ambient. the maximum power dissipation can be calculated by following formula : p d(max) = ( t j(max) - t a ) / ja where t j(max) is the maximum operating junction temperature 125 c, t a is the ambient temperature and the ja is the junction to ambient thermal resistance. instable enable function the rt9198/a features an ldo regulator enable/disable function. to assure the rt9198 ldo regulator will switch on, the en turn on control level must be greater than 1.2v. the rt9198 ldo regulator will go into shutdown mode when the voltage on the en pin falls below 0.4v. for rt9198a, the en turn on control level must be lower than 0.4v to assure the rt9198a ldo regulator switch on. the rt9198a ldo regulator will go into shutdown mode when the voltage on the en pin is higher than 1.2 v. the rt9198a equips a quick-discharge function to protect the system. when the regulator is turned off by en pin, the internal mosfet between v out and gnd will be turned on to discharge output voltage quickly. if the enable function is not needed in a specific application, it may be tied to gnd/vin to keep the ldo regulator in a continuously on state. figure 1 region of stable c out esr vs. load current 0.00 0.01 0.10 1.00 10.00 100.00 0 50 100 150 200 250 300 load current (ma) c out esr ( ? ) c out = 1uf instable stable 100 10 1 rt9198/a-15cu5 c out = 1 f, x7r simulation verify
rt9198/a 10 ds9198/a-10 november 2006 www.richtek.com figure 2. derating curve for packages 0 100 200 300 400 500 600 700 0 15 30 45 60 75 90 105 120 135 ambient temperature (c) maximum power dissipation (m ? ) 1 sot-23-3 sot-23-5 sc 70-5 sc-82 wdfn-6l 2x2 for recommended operating conditions specification of rt9198/a, where t j(max) is the maximum junction temperature of the die (125 c) and t a is the maximum ambient temperature. the junction to ambient thermal resistance ( ja is layout dependent) for sot-23-3/ sot-23-5 package is 250 c/w, sc-70-5 and sc-82 package is 333 c/w and wdfn-6l 2x2 package is 165 c/w on standard jedec 51-3 thermal test board. the maximum power dissipation at t a = 25 c can be calculated by following formula : p d(max) = (125 c ? 25 c)/250 = 400mw (sot-23-3/ sot-23-5) p d(max) = (125 c ? 25 c)/333 = 300mw (sc-70-5, sc-82) p d(max) = (125 c ? 25 c) / 165 = 606mw (wdfn-6l 2x2) the maximum power dissipation depends on opera ting ambient temperature for fixed t j(max) and thermal resistance ja . for rt9198/a packages, the figure 2. of derating curves allows the designer to see the effect of rising ambient temperature on the maximum power allowed.
rt9198/a 11 ds9198/a-10 november 2006 www.richtek.com outline dimension a b a1 b d c e h l sot-23-3 surface mount package dimensions in millimeters dimensions in inches symbol min max min max a 0.889 1.295 0.035 0.051 a1 0.000 0.152 0.000 0.006 b 1.397 1.803 0.055 0.071 b 0.356 0.508 0.014 0.020 c 2.591 2.997 0.102 0.118 d 2.692 3.099 0.106 0.122 e 1.803 2.007 0.071 0.079 h 0.080 0.254 0.003 0.010 l 0.300 0.610 0.012 0.024
rt9198/a 12 ds9198/a-10 november 2006 www.richtek.com a a1 e b b d c h l sot-23-5 surface mount package dimensions in millimeters dimensions in inches symbol min max min max a 0.889 1.295 0.035 0.051 a1 0.000 0.152 0.000 0.006 b 1.397 1.803 0.055 0.071 b 0.356 0.559 0.014 0.022 c 2.591 2.997 0.102 0.118 d 2.692 3.099 0.106 0.122 e 0.838 1.041 0.033 0.041 h 0.080 0.254 0.003 0.010 l 0.300 0.610 0.012 0.024
rt9198/a 13 ds9198/a-10 november 2006 www.richtek.com a a1 e b b d c h l sc - 70 - 5 surface mount package dimensions in millimeters dimensions in inches symbol min max min max a 0.800 1.100 0.031 0.044 a1 0.000 0.100 0.000 0.004 b 1.150 1.350 0.045 0.054 b 0.150 0.400 0.006 0.016 c 1.800 2.450 0.071 0.096 d 1.800 2.250 0.071 0.089 e 0.650 0.026 h 0.080 0.260 0.003 0.010 l 0.210 0.460 0.008 0.018
rt9198/a 14 ds9198/a-10 november 2006 www.richtek.com dimensions in millimeters dimensions in inches symbol min max min max a 0.800 1.100 0.031 0.043 a1 0.000 0.100 0.000 0.004 b 1.150 1.350 0.045 0.053 b 0.150 0.400 0.006 0.016 b1 0.350 0.500 0.014 0.020 c 1.800 2.450 0.071 0.096 d 1.800 2.200 0.071 0.087 e 1.300 0.051 h 0.080 0.260 0.003 0.010 l 0.200 0.460 0.008 0.018 sc - 82 surface mount package e d a c b a1 l b b1 h e
rt9198/a 15 ds9198/a-10 november 2006 www.richtek.com richtek technology corp. headquarter 5f, no. 20, taiyuen street, chupei city hsinchu, taiwan, r.o.c. tel: (8863)5526789 fax: (8863)5526611 richtek technology corp. taipei office (marketing) 8f-1, no. 137, lane 235, paochiao road, hsintien city taipei county, taiwan, r.o.c. tel: (8862)89191466 fax: (8862)89191465 email: marketing@richtek.com dimensions in millimeters dimensions in inches symbol min max min max a 0.700 0.800 0.028 0.031 a1 0.000 0.050 0.000 0.002 a3 0.175 0.250 0.007 0.010 b 0.200 0.350 0.008 0.014 d 1.950 2.050 0.077 0.081 d2 1.000 1.450 0.039 0.057 e 1.950 2.050 0.077 0.081 e2 0.500 0.850 0.020 0.033 e 0.650 0.026 l 0.300 0.400 0.012 0.016 w-type 6l dfn 2x2 package d 1 e a3 a a1 e b l d2 e2 see detail a 1 1 2 2 note : the configuration of the pin #1 identifier is optional, but must be located within the zone indicated. det ail a pin #1 id and tie bar mark options

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