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RT9054 ? ds9054-03 february 2012 www.richtek.com 1 ? copyright 2012 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. ordering information general description the RT9054 is a dual channel, low noise, and low dropout regulator sourcing up to 300ma at each channel. the range of output voltage is from 1.2v to 3.6v by operating from 2.5v to 5.5v input. the RT9054 offers 3% accuracy, extremely low dropout voltage (240mv @ 300ma), and extremely low ground current, only 27 a per ldo. the shutdown current is near zero current which is suitable for battery-power devices. other features include current limiting, over temperature and output short circuit protection. the RT9054 is short circuit thermal folded back protected. the ic lowers its otp trip point from 165 c to 110 c when output short circuit occurs (v out < 0.4v) providing maximum safety to end users. the RT9054 can operate stably with very small ceramic output capacitors, reducing required board space and component cost. the RT9054 is available in fixed output voltages in the wdfn-6l 1.6x1.6 packages. portable power management 300ma dual ldo regulator features z wide operating voltage ranges : 2.5v to 5.5v z low-noise for rf application z no noise bypass capacitor required z fast response in line/load transient z ttl-logic-controlled shutdown input z low temperature coefficient z z z z z dual ldo outputs (300ma/300ma) z z z z z ultra-low quiescent current 27 a/ldo z z z z z high output accuracy 3% z z z z z short circuit protection z z z z z thermal shutdown protection z z z z z current limit protection z z z z z short circuit thermal folded back protection z z z z z tiny 6-lead wdfn packages z rohs compliant and halogen free applications z z z z z cdma/gsm cellular handsets z z z z z battery-powered equipment z z z z z laptop, palmtops, notebook computers z z z z z hand-held instruments z z z z z pcmcia cards z z z z z portable information appliances marking information for marking information, contact our sales representative directly or through a richtek distributor located in your area. code voltage code voltage code voltage a 3.5 b 1.3 c 1.2 d 1.85 e 2.1 f 1.5 g 1.8 h 2 j 2.5 k 2.6 l 2.7 m 2.8 n 2.85 p 3 q 3.1 r 3.2 s 3.3 t 2.65 v 2.9 w 1.6 x 3.15 y 1.9 u 1.4 available voltage version note : richtek 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. RT9054- package type qw : wdfn-6l 1.6x1.6 (w-type) lead plating system g : green (halogen free and pb free) output voltage : vout1/vout2 vout2 > vout1 is recommended
2 ds9054-03 february 2012 www.richtek.com RT9054 ? copyright 2012 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. functional pin description pin no. pin name pin function 1 vin supply input. 2 en1 chip enable1. 3 en2 chip enable2. 4, 7 (exposed pad) gnd common ground. the exposed pad must be soldered to a large pcb and connected to gnd for maximum power dissipation. 5 vout2 channel 2 output voltage. 6 vout1 channel 1 output voltage. typical application circuit pin configurations RT9054 gnd vin v in 1f c in vout2 v out2 c out2 en1 en2 chip enable vout1 v out1 4.7f/x7r c out1 4.7f/x7r vin en2 vout1 gnd vout2 en1 1 2 3 5 4 6 gnd 7 (top view) wdfn-6l 1.6x1.6
3 ds9054-03 february 2012 www.richtek.com RT9054 ? copyright 2012 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. function block diagram en1 current-limit and thermal protection mos driver + - vout1 shutdown and logic control vin error amplifier v ref gnd en2 current-limit and thermal protection mos driver + - vout2 shutdown and logic control error amplifier v ref gnd 250k 250k
4 ds9054-03 february 2012 www.richtek.com RT9054 ? copyright 2012 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. electrical characteristics parameter symbol test conditions min typ max unit dropout voltage (note 5) v drop i outx = 300ma -- 240 330 mv output voltage range v outx 1.2 -- 3.6 v v out accuracy v ou tx i outx = 1ma to 300ma ? 3 -- +3 % line regulation v line v in = (v outx + 0.3v) to 5.5v or v in > 2.5v, whichever is lar ger -- -- 0.2 %/v load regulation v load 1ma < i outx < 300ma -- -- 0.6 % current limit i lim r load = 1 330 450 700 ma quiescent current i q v enx > 1.5v -- 58 80 a shutdown current i q_sd v enx < 0.4v -- -- 1 a output voltage tc -- 100 -- ppm/ c logic high v ih v in = 2.5v to 5.5v, power on 1.5 -- -- en input threshold voltage logic low v il v in = 2.5v to 5.5v, shutdown -- -- 0.4 v en input pull-low resistor 150 250 330 k v out discharge resistance in shutdown (note 6) v in = 5v, en1 = en2 = gnd -- 3 -- k thermal shutdown t sd -- 170 -- c thermal shutdown hysteresis t sd -- 40 -- c (v in = v outx + 1v, v enx = v in , c in = 1 f, c out = 4.7 f, t a = 25 c, unless otherwise specified.) recommended operating conditions (note 4) z supply input v oltage ------------------------------------------------------------------------------------------------------ 2.5v to 5.5v z enable input v oltage ------------------------------------------------------------------------------------------------------ 0v to 5.5v z junction temperature range -------------------------------------------------------------------------------------------- ? 40 c to 125 c z ambient temperature range -------------------------------------------------------------------------------------------- ? 40 c to 85 c absolute maximum ratings (note 1) z supply input voltage ------------------------------------------------------------------------------------------------------ ? 0.3v to 7v z other i/o pin v oltages --------------------------------------------------------------------------------------------------- ? 0.3v to 7v z power dissipation, p d @ t a = 25 c wdfn-6l 1.6x1.6 --------------------------------------------------------------------------------------------------------- 0.571w z package thermal resistance (note 2) ----------------------------------------------------------------------------- wdfn-6l 1.6x1.6, ja ---------------------------------------------------------------------------------------------------- 175 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 3) hbm (human body mode) ---------------------------------------------------------------------------------------------- 2kv mm (ma chine mode) ------------------------------------------------------------------------------------------------------ 200v
5 ds9054-03 february 2012 www.richtek.com RT9054 ? copyright 2012 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. note 1. stresses beyond those listed ? absolute maximum ratings ? may cause permanent damage to the device. these are stress ratings only, and 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 may affect device reliability. note 2. ja is measured at t a = 25 c on a low effective thermal conductivity single-layer test board per jedec 51-3. jc is measured at the exposed pad of the package. note 3. devices are esd sensitive. handling precaution recommended. note 4. the device is not guaranteed to function outside its operating conditions. note 5. the dropout voltage is defined as v in -v out , which is measured when v out is v out(normal) ? 100mv. note 6. it is guaranteed by design. parameter symbol test conditions min typ max unit f = 100hz -- 70 -- f = 1khz -- 70 -- psrr v in = v out + 1v, c out = 4.7 f i load = 50ma psrr f = 10khz -- 70 -- db f = 100khz -- 54 -- f = 200khz -- 45 -- psrr v in = v out + 1v, c out = 4.7 f i load = 50ma f = 300khz -- 38 -- db output voltage noise c out1 = c out2 = 10 f, 1 0h z to 100khz, i out1 = i out2 = 1ma -- 100 -- v rms
6 ds9054-03 february 2012 www.richtek.com RT9054 ? copyright 2012 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. typical operating characteristics output voltage vs. temperature 1.7 1.75 1.8 1.85 1.9 -50 -25 0 25 50 75 100 125 temperature output voltage (v) RT9054-gs, v out1 ( c) output voltage vs. temperature 3.2 3.25 3.3 3.35 3.4 -50 -25 0 25 50 75 100 125 temperature output voltage (v) RT9054-gs, v out2 ( c) RT9054-gs, both i load = 1ma v in = 3.8v to 4.8v line transient response v in (v) time (100 s/div) v out1 (10mv/div) 4.8 3.8 v out2 (10mv/div) quiescent current vs. temperature 50 55 60 65 70 -50 -25 0 25 50 75 100 125 temperature quiescent current (ua) RT9054-gs v in = v enx = 4.3v ( c) power on from v in time (10 s/div) RT9054-fm, v en1 = v en2 = 1.5v both i load = 10ma v in (5v/div) v out2 (2v/div) v out1 (1v/div) dropout voltage vs. load current 0 50 100 150 200 250 300 350 0 50 100 150 200 250 300 load current (ma) dropout voltage (mv) RT9054-gs, v out2 t j = 25 c t j = -40 c t j = 125 c
7 ds9054-03 february 2012 www.richtek.com RT9054 ? copyright 2012 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. RT9054-gs, both i load = 100ma v in = 3.8v to 4.8v line transient response v in (v) time (100 s/div) v out1 (10mv/div) 4.8 3.8 v out2 (10mv/div) RT9054-gs, both i load = 10ma v in = 3.8v to 4.8v line transient response v in (v) v out1 (10mv/div) 4.8 3.8 v out2 (10mv/div) time (100 s/div) RT9054-gs, both i load = 50ma v in = 3.8v to 4.8v line transient response v in (v) time (100 s/div) v out1 (10mv/div) 4.8 3.8 v out2 (10mv/div) load transient response time (250 s/div) i out (50ma/div) v out2 (20mv/div) v out1 (20mv/div) RT9054-gs, i load = 10ma to 50ma v in = v en = 4.3v load transient response time (250 s/div) i out (100ma/div) v out2 (20mv/div) v out1 (20mv/div) RT9054-gs, i load = 10ma to 100ma v in = v en = 4.3v power on from en time (5 s/div) RT9054-fm, v in = 5v i out1 = i out2 = 50ma (5v/div) (1v/div) v en1 = v en2 v out1 v out2
8 ds9054-03 february 2012 www.richtek.com RT9054 ? copyright 2012 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. psrr -80 -60 -40 -20 0 20 10 100 1000 10000 100000 100000 0 frequency(hz) psrr(db) i out = 50ma psrr 1m 100k 10k 1k noise time (10ms/div) RT9054-gs, no load v in = v enx = 4.5v(by battery) noise ( v/div) 150 100 50 0 -50 -100 -150 noise time (10ms/div) RT9054-gs, i load = 50ma v in = v enx = 4.5v(by battery) noise ( v/div) 300 200 100 0 -100 -200 -300 en pin shutdown response time (50 s/div) RT9054-fm, v in = 5v i out1 = i out2 = 50ma (5v/div) (1v/div) v en1 = v en2 v out1 v out2 v en1 (2v/div) (1v/div) v en1 v out1 v out2 en1 pin shutdown response v en2 v en2 (2v/div) time (10ms/div) en2 pin shutdown response (1v/div) v en1 v out1 v out2 v en2 v en1 (2v/div) v en2 (2v/div) time (10ms/div)
9 ds9054-03 february 2012 www.richtek.com RT9054 ? copyright 2012 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. application information like any low-dropout regulator, the external capacitors used with the RT9054 must be carefully selected for regulator stability and performance. using a capacitor value is >1 f on the RT9054 input, and the amount of capacitance can be increased without limit. the input capacitor must be located at 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 ldo applications. the RT9054 is designed specifically to work with low esr ceramic output capacitor under space-saving and performance consideration. using a ceramic capacitor with value at least 4.7 f and esr is > 20m on the RT9054 output ensures stability. the RT9054 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 not more than 0.5 inch from the vout pin of the RT9054 and returned to a clean analog ground. figure 1. stable cout esr range thermal considerations thermal protection limits power dissipation in RT9054. when the operation junction temperature exceeds 170 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 40 c. the RT9054 lowers its otp trip level from 170 c to 110 c when output short circuit occurs (v out < 0.4v) as shown in figure 2. it limits the ic case temperature to under 100 c and provides maximum safety to customer while output short circuit occurs. for continuous operation, do not exceed absolute maximum operation junction temperature 125 c. the power dissipation definition in device is : p d = (v in -v out ) x i out + v in x i q the maximum power dissipation depends on the thermal resistance of the ic package, pcb layout, rate of surrounding airflow and temperature difference between junction to ambient. the maximum power dissipation can be calculated by the following formula : p d(max) = (t j(max) ? t a ) / ja where t j(max) is the maximum operation junction temperature, t a is the ambient temperature and ja is the junction to ambient thermal resistance. figure 2. short circuit thermal folded back protection when output short circuit occurs (patent) v out short to gnd 0.4v v out i out t sd otp trip point 170 c 110 c 110 c 80 c ic temperature region of stable c out esr vs. load current 0.001 0.01 0.1 1 10 100 0 50 100 150 200 250 300 load current (ma) region of stable c out esr ( ? ) region of stable c out esr ( ) unstable range stable range simulation verify RT9054-fm, c out = 4.7 f/x7r
10 ds9054-03 february 2012 www.richtek.com RT9054 ? copyright 2012 richtek technology corporation. all rights reserved. is a registered trademark of ric htek technology corporation. for recommended operating conditions specification of the ic, the maximum junction temperature is 125 c. the junction to ambient thermal resistance ( ja is layout dependent ) for wdfn-8l 1.6x1.6 is 175 c/w on the standard jedec 51-3 single-layer thermal test board. the maximum power dissipation at t a = 25 c can be calculated by the following formula : p d(max) = ( 125 c ? 25 c ) / (175 c/w) = 0.571w for wdfn-6l 1.6x1.6 packages the maximum power dissipation depends on the operating ambient temperature for fixed t j(max) and thermal resistance ja . for the ic packages, the figure 3 of de- rating curves allows the designer to see the effect of rising ambient temperature on the maximum power dissipation. figure 3. derating curve of maximum power dissipation 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 0 25 50 75 100 125 ambient temperature (c) power dissipation (w) single layer pcb wdfn-6l 1.6x1.6
11 ds9054-03 february 2012 www.richtek.com RT9054 richtek technology corporation 5f, no. 20, taiyuen street, chupei city hsinchu, taiwan, r.o.c. tel: (8863)5526789 richtek products are sold by description only. richtek reserves the right to change the circuitry and/or specifications without notice at any time. customers should obtain the latest relevant information and data sheets before placing orders and should verify that such information is current and complete. richtek cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a richtek product. information furnish ed by richtek is believed to be accurate and reliable. however, no responsibility is assumed by richtek or its subsidiaries for its use; nor for any infringeme nts of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of r ichtek or its subsidiaries. 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 0.300 0.008 0.012 d 1.550 1.650 0.061 0.065 d2 0.950 1.050 0.037 0.041 e 1.550 1.650 0.061 0.065 e2 0.550 0.650 0.022 0.026 e 0.500 0.020 l 0.190 0.290 0.007 0.011 w-type 6l dfn 1.6x1.6 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 outline dimension

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