unisonic technologies co., ltd lm2954 linear integrated circuit www.unisonic.com.tw 1 of 7 copyright ? 2017 unisonic technologies co., ltd qw-r102-002.o 300ma low-dropout voltage regulator ? description the utc lm2954 is a monolithic integrated voltage regulator with low dropout voltage, and low quiescent current. it includes many features that suitable for different applications with to-92, dip-8, sop-8 and sot-223 packages. ? features *high accuracy fixed output. *output voltage programmable a nd logic controlled shutdown and error flag available for dip and sop package. *extremely low quiescent current and dropout voltage. *extremely tight load and line regulation. *current and thermal limiting. *very low temperature coefficient. ? ordering information ordering number pin assignment lead free halogen free package 1 2 3 packing lm2954l-xx-aa3-r lm2954g-xx-aa3-r sot-223 i g o tape reel lm2954l-xx-aa3-a-r lm2954g-xx-aa3-a-r sot-223 g o i tape reel lm2954l-xx-d08-t lm2954g -xx-d08-t dip-8 tube lm2954l-xx-s08-r lm29 54g-xx-s08-r sop-8 refer to pin configurations tape reel lm2954l-xx-t92-b lm2954g-xx-t92-b to-92 o g i tape box lm2954l-xx-t92-k lm2954g-xx-t92-k to-92 o g i bulk note: pin assignment: i: v in o: v out g: gnd
lm2954 linear integrated circuit unisonic technologies co., ltd 2 of 7 www.unisonic.com.tw qw-r102-002.o ? marking information package voltage code marking sot-223 33:3.3v 50:5.0v to-92 3.3:3.3v 5.0:5.0v utc lm2954 1 data code voltage code l: lead free g: halogen free dip-8 sop-8 3.3:3.3v 5.0:5.0v ad: adj
lm2954 linear integrated circuit unisonic technologies co., ltd 3 of 7 www.unisonic.com.tw qw-r102-002.o ? pin configurations 2 1 3 output gnd input utc lm2954 to-92 plastic package bottom view 1 2 3 4 8 7 6 5 input feedback 5v tap shutdown sense output utc lm2954 gnd error sop-8 or dip-8 package utc lm2954 input gnd output sot-223 package
lm2954 linear integrated circuit unisonic technologies co., ltd 4 of 7 www.unisonic.com.tw qw-r102-002.o ? block diagram
lm2954 linear integrated circuit unisonic technologies co., ltd 5 of 7 www.unisonic.com.tw qw-r102-002.o ? absolute maximum ratings parameter symbol value unit supply voltage v cc -0.3 ~ 28 v feedback voltage v fb -1.5 ~ 28 v shutdown voltage v shdn -0.3 ~ 28 v comparator output voltage v out -0.3 ~ 28 v junction temperature t j +125 c operating temperature t opr -40 ~ +85 c storage temperature t stg -40 ~ +150 c notes: 1.absolute maximum ratings are those values beyond which the device which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device operation is not implied. 2.the device is guaranteed to meet performance specific ation within 0c~+70c op erating temperature range and assured by design from -20c~+85c, characterist ic and correlation with static process control. ? electrical characteristics (t j =25c, v in =6v, i l =100 a, c l =1 f, unless otherwise specified) parameter symbol test conditions min. typ. max. unit lm2954-3.3 3. 23 3.3 3.37 output voltage lm2954-5.0 v out t j =25c 4.90 5.0 5.10 v output voltage temperature coefficient t c v o 20 100 ppm/c line regulation v out Q 6v v in Q 28v 0.1 0.2 load regulation v out 100 Q ai l Q 300ma 0.2 0.5 % i l =100ma 400 dropout voltage v d i l =200ma (note 2) 380 450 600 mv il=100 a 0.12 0.23 ground current ignd il=200 a 12 14 ma dropout ground current i d v in =4.5v, i l =100 a 560 650 a current limit i limit v out =0 300 ma c l =1 f 430 c l =200 f 160 output noise (10hz to 100khz) e n c l =3.3 f 100 v
lm2954 linear integrated circuit unisonic technologies co., ltd 6 of 7 www.unisonic.com.tw qw-r102-002.o ? electrical characteristics(cont.) lm2954-adj for 8-pin version only parameter symbol test conditions min typ max unit reference voltage v ref 1.22 1.235 1.25 v reference voltage v ref v ref ? v out ? (v in -1v), 2.3v ? v in ? 18v, 100 a ? i l ? 100ma, t j ? t jmax 1.19 1.27 v feedback pin bias current i b(fb) 20 40 na reference voltage temperature coefficient t c v ref 50 ppm/c feedback bias current temperature coefficient t c i o 0.1 na/c error comparator output leakage current i o(leak) v oh =28v 1 a output low voltage v ol v in =4.5v, i ol =400 a 250 mv upper threshold voltage v thd(up) (note 3) 3.2 %v out lower threshold voltage v thd(low) (note 3) 7.6 %v out hysteresis v hys (note 3) 15 mv shutdown input low (regulator on) 1.3 0.70 input logic voltage v i(log) high (regulator off) 2.0 v v shdn =2.4v 30 50 a shutdown pin input current i i(shdn) v shdn =28v 450 600 a regulator output current shutdown i o(shdn) v shdn R 2v,v in Q 28v, v out =0, feedback pin tied to 5v tap. 3 10 a note: 1. additional conditions for 8-pin versions are feedback tied to 5v tap an output tied to output sense (v out =5v) and v shdn Q 0.8v. 2. dropout voltage is defined as t he input to output differential at whic h the output voltage drops 100mv below its nominal value measured at 1v differential. 3. comparator thresholds are expressed in terms of percentage value of voltage output.
lm2954 linear integrated circuit unisonic technologies co., ltd 7 of 7 www.unisonic.com.tw qw-r102-002.o ? application circuit (10a low dropout regulator) for 8 pins +v in fb v out gnd sd utc lm2954 8 5 7 1 4 3 current limit section +v in =v out +0.5v 0.05 470 680 4.7m 20k 220 0.033 f 47 r1 r2 4.7 f 100 f 1% 10k 2n3906 +v out 10 a v out =1.23v*(1+r1/r2) for 5v output use internal resistors.wire pin 6 to 7 and wire pin 2 to +v out utc d65h0 error for 3 pins utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in lif e support appliances, devices or systems where malfunction of these products can be reasonably expe cted to result in personal injury. reproduction in whole or in part is prohibited without the prior writ ten consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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