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unisonic technologies co., ltd lm2940 linear integrated circuit www.unisonic.com.tw 1 of 11 copyright ? 2010 unisonic technologies co., ltd qw-r102-016.j 1a low-dropout positive voltage regulator ? description the utc lm2940 is a low dropout regulator designed to provide output current up to 1a with a typically 500mv dropout voltage and a maximum of 1v. it is capable of reducing the ground current when the differential between the input voltage and the output volt age outrun 3v. utc lm2940 offers low quiescent current (typically 30ma at 1a and an input-output differential of 5v). higher quiescent currents only exist when the regulator is in the dropout mode (v in -v out 3v). ? features * 500mv typically dropout at 1a * output current in excess of 1a * low quiescent current * reversed-battery protection * current limit and thermal shutdown. * mirror image insertion protection 1 ? ordering information ordering number pin assignment lead free halogen free package 1 2 3 packing lm2940l-xx-aa3-r LM2940G-XX-AA3-R sot-223 i g o tape reel lm2940l-xx-ta3-t lm2940g-xx-ta3-t to-220 i g o tube lm2940l-xx-tn3-r lm2940g-xx-tn3-r to-252 i g o tape reel lm2940l-xx-tn3-t lm2940g-xx-tn3-t to-252 i g o tube lm2940l-xx-tq2-r lm2940g-xx-tq2-r to-263 i g o tape reel lm2940l-xx-tq2-t lm2940g-xx-tq2-t to-263 i g o tube lm2940l-xx-tq3-r lm2940g-xx-tq3-r to-263-3 i g o tape reel lm2940l-xx-tq3-t lm2940g-xx-tq3-t to-263-3 i g o tube note: 1.xx: output voltage, refer to marki ng information. 2.pin assignment: i: v in g: gnd o:v out
lm2940 linear integrated circuit unisonic technologies co., ltd 2 of 11 www.unisonic.com.tw qw-r102-016.j ? marking information package voltage code marking sot-223 to-220 to-252 to-263 to-263-3 50 : 5v 60 : 6v 80 : 8v 90 : 9v 10 :10v 12 :12v 15 :15v 123 utc lm2940 lot code date code l: lead free g: halogen free voltage code
lm2940 linear integrated circuit unisonic technologies co., ltd 3 of 11 www.unisonic.com.tw qw-r102-016.j ? absolute maximum ratings parameter symbol ratings unit input voltage v in 26 v power dissipation p d internally limited junction temperature t j +150 c to-220/to-263-3/to-263 -40 ~ +125 c ambient operating temperature sot-223 t opr -40 ~ +85 c storage temperature t stg -65 ~ +150 c note: absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. ? thermal data parameter symbol rating unit sot-223 174 to-220 60 junction to ambient to-263/to-263-3 ja 80 c/w to-220 4 junction to case to-263/to-263-3 jc 4 c/w ? electrical characteristics (t a =t j =25 c, v in =v out +5v, i out =1a and c out =22 f, unless otherwise specified.) for lm2940-5.0v parameter symbol test conditions min typ max unit output voltage v out 6.25v v in 26v, 5ma i out 1a 4.85 5.00 5.15 v line regulation v out v out +2v v in 26v, i out =5ma 20 50 mv load regulation v out 50ma i out 1a 35 50 mv output impedance r out 100 ma dc and 20marms, fo=120hz 35 m ? quiescent current i q v out +2v v in 26v, i out =5ma 10 15 ma output noise voltage en 10hz-100khz, i out =5ma 150 vrms ripple rejection rr fo=120hz, 1vrms, i out =100ma 54 72 db long term stability 20 mv/1000hr i out =1a 0.5 0.8 dropout voltage v d i out =100ma 0.13 0.15 v short circuit current i sc (note) 2.5 a maximum line transient t in r out =100 ? , t 100ms 60 75 v reverse polarity dc input voltage v rin r out =100 ? -15 -30 v reverse polarity transient input voltage v trri r out =100 ? , t 100ms -50 -75 v for lm2940-6.0v parameter symbol test conditions min typ max unit output voltage v out 7.5v v in 26v, 5ma i out 1a 5.82 6.00 6.18 v line regulation v out v out +2v v in 26v, i out =5ma 20 60 mv load regulation v out 50ma i out 1a 40 60 mv output impedance r out 100 ma dc and 20marms, fo=120hz 40 m ? quiescent current i q v out +2v v in 26v, i out =5ma 10 15 ma output noise voltage en 10hz-100khz, i out =5ma 180 vrms ripple rejection rr fo=120hz, 1vrms, i out =100ma 60 72 db long term stability 20 mv/1000hr i out =1a 0.5 0.8 dropout voltage v d i out =100ma 0.13 0.15 v short circuit current i sc (note) 2.5 a maximum line transient t in r out =100 ? , t 100ms 60 75 v reverse polarity dc input voltage v rin r out =100 ? -15 -30 v reverse polarity transient input voltage v trri r out =100 ? , t 100ms -50 -75 v
lm2940 linear integrated circuit unisonic technologies co., ltd 4 of 11 www.unisonic.com.tw qw-r102-016.j ? electrical characteristics(cont.) for lm2940-8.0v parameter symbol test conditions min typ max unit output voltage v out 9.4v v in 26v, 5ma i out 1a 7.76 8.00 8.24 v line regulation v out v out +2v v in 26v, i out =5ma 20 80 mv load regulation v out 50ma i out 1a 55 80 mv output impedance r out 100 ma dc and 20marms, fo=120hz 55 m ? quiescent current i q v out +2v v in 26v, i out =5ma 10 15 ma output noise voltage en 10hz-100khz, i out =5ma 240 vrms ripple rejection rr fo=120hz, 1vrms, i out =100ma 54 66 db long term stability 32 mv/1000hr i out =1a 0.5 0.8 dropout voltage v d i out =100ma 0.13 0.15 v short circuit current i sc (note) 2.5 a maximum line transient t in r out =100 ? , t 100ms 60 75 v reverse polarity dc input voltage v rin r out =100 ? -15 -30 v reverse polarity transient input voltage v trri r out =100 ? , t 100ms -50 -75 v for lm2940-9.0v parameter symbol test conditions min typ max unit output voltage v out 10.5v v in 26v, 5ma i out 1a 8.73 9.00 9.27 v line regulation v out v out +2v v in 26v, i out =5ma 20 90 mv load regulation v out 50ma i out 1a 60 90 mv output impedance r out 100 ma dc and 20marms, fo=120hz 60 m ? quiescent current i q v out +2v vin 26v, i out =5ma 10 15 ma output noise voltage en 10hz-100khz, i out =5ma 270 vrms ripple rejection rr fo=120hz, 1vrms, i out =100ma 52 64 db long term stability 34 mv/1000h r i out =1a 0.5 0.8 dropout voltage v d i out =100ma 0.13 0.15 v short circuit current i sc (note) 2.5 a maximum line transient t in r out =100 ? , t 100ms 60 75 v reverse polarity dc input voltage v rin r out =100 ? -15 -30 v reverse polarity transient input voltage v trri r out =100 ? , t 100ms -50 -75 v for lm2940-10v parameter symbol test conditions min typ max unit output voltage v out 11.5v v in 26v, 5ma i out 1a 9.70 10.00 10.30 v line regulation v out v out +2v v in 26v, i out =5ma 20 100 mv load regulation v out 50ma i out 1a 65 100 mv output impedance r out 100 ma dc and 20marms, fo=120hz 65 m ? quiescent current i q v out +2v v in 26v, i out =5ma 10 15 ma output noise voltage en 10hz-100khz, i out =5ma 300 vrms ripple rejection rr fo=120hz, 1vrms, i out =100ma 51 63 db long term stability 36 mv/1000h r i out =1a 0.5 0.8 dropout voltage v d i out =100ma 0.13 0.15 v short circuit current i sc (note) 2.5 a maximum line transient t in r out =100 ? , t 100ms 60 75 v reverse polarity dc input voltage v rin r out =100 ? -15 -30 v reverse polarity transient input voltage v trri r out =100 ? , t 100ms -50 -75 v
lm2940 linear integrated circuit unisonic technologies co., ltd 5 of 11 www.unisonic.com.tw qw-r102-016.j ? electrical characteristics(cont.) utc lm2940-12v parameter symbol test conditions min typ max unit output voltage v out 13.6v v in 26v, 5ma i out 1a 11.64 12.00 12.36 v line regulation v out v out +2v v in 26v, i out =5ma 20 120 mv load regulation v out 50ma i out 1a 55 120 mv output impedance r out 100 madc and 20marms, fo=120hz 80 m ? quiescent current i q v out +2v v in 26v, i out =5ma 10 15 ma output noise voltage en 10hz-100khz, i out =5ma 360 vrms ripple rejection rr fo=120hz, 1vrms, i out =100ma 54 66 db long term stability 48 mv/1000h r i out =1a 0.5 0.8 dropout voltage v d i out =100ma 0.11 0.15 v short circuit current i sc (note) 2.5 a maximum line transient t in r out =100 ? , t 100ms 60 75 v reverse polarity dc input voltage v rin r out =100 ? -15 -30 v reverse polarity transient input voltage v trri r out =100 ? , t 100ms -50 -75 v utc lm2940-15v parameter symbol test conditions min typ max unit output voltage v out 16.75v v in 26v, 5ma i out 1a 14.55 15.00 15.45 v line regulation v out v out +2v v in 26v, i out =5ma 20 150 mv load regulation v out 50ma i out 1a 70 150 mv output impedance r out 100 madc and 20marms, fo=120hz 100 m ? quiescent current i q v out +2v v in 26v, i out =5ma 10 15 ma output noise voltage en 10hz-100khz, i out =5ma 450 vrms ripple rejection rr fo=120hz, 1vrms, i out =100ma 52 64 db long term stability 60 mv/1000h r i out =1a 0.5 0.8 dropout voltage v d i out =100ma 0.11 0.15 v short circuit current i sc (note) 2.5 a maximum line transient t in r out =100 ? , t 100ms 60 75 v reverse polarity dc input voltage v rin r out =100 ? -15 -30 v reverse polarity transient input voltage v trri r out =100 ? , t 100ms -50 -75 v note: output current will decrease with te mperature increase but will not drop below 1a at the maximum specified temperature.
lm2940 linear integrated circuit unisonic technologies co., ltd 6 of 11 www.unisonic.com.tw qw-r102-016.j ? typical application note: 1. c 1 is required if regulator is located far from power supply filter. 2. c o must be higher than 22 f for stability, and locate as close as possible to the regulator.
lm2940 linear integrated circuit unisonic technologies co., ltd 7 of 11 www.unisonic.com.tw qw-r102-016.j ? typical characteristics 0400 0.4 output current (ma) dropout voltage vs. output current input-output differential (v) 600 0.2 0.3 0.5 0.1 200 800 1000 0 0.6 0.7 0.8 0.9 t j =25 -40 40 0.4 dropout voltage vs.temperature dropout voltage (v) 80 0.2 0.3 0.5 0.1 0 120 160 0 0.6 0.7 0.8 0.9 1a 1.0 temperature ( ) 500ma 100ma -40 40 4.98 output voltage vs. temperature output voltage (v) 80 4.94 4.96 5.00 4.92 0 120 160 4.90 5.02 5.04 5.06 5.08 5.10 -40 40 20 quiescent current vs. temperature quiescent current (ma) 80 10 0 120 160 0 30 40 50 1a 500ma 10ma v in =v out +5v 0 10 40 quiescent current vs. input voltage quiescent current (ma) 15 20 5 20 25 0 60 80 100 input voltage (v) 1a 100ma 30 35 120 140 160 180 200 500ma 00.4 20 quiescent current vs. load current quiescent current (ma) 0.6 10 0.2 0.8 1.0 0 30 40 50 load current (a) v in =14v v out =5v temperature ( ) temperature ( ) t j =25
lm2940 linear integrated circuit unisonic technologies co., ltd 8 of 11 www.unisonic.com.tw qw-r102-016.j ? typical characteristics (cont.) -10 10 -10 time ( s) line transient response 20 -30 -20 0 3v 03040 0v 10 20 30 1 100 ripple rejection vs. frequency ripple rejection (db) 1k 45 55 35 10 10k 100k 65 75 85 95 frequency (hz) 1.0 3.0 low voltage behavior output voltage (v) 4.0 2.0 2.0 5.0 6.0 1.0 3.0 4.0 5.0 input voltage (v) 0 4 6 2 2 8 10 0 4 6 input voltage (v) 12 14 8 10 12 14 50 60 -10 10 -0.4 load transient response load current (a) 20 1.0 -0.5 -0.3 0.5 03040 0 -0.2 -0.1 0.5 0.1 0.2 0.3 0.4 0 output voltage deviation (v) v in =10v vo ut =5 v c out =22 f 1m v in =10v vo ut =5 v c out =22 f io ut =10ma io ut =1a vo ut =5 v t j =25 output voltage (v) low voltage behavior io ut =1a vo ut =8 v 0 6 3 3 9 12 0 6 input voltage (v) 15 18 9 12 15 18 output voltage (v) low voltage behavior io ut =1a vo ut =9 v input voltage change(v) output voltage deviation(mv) time ( s) t j =25 t j =25 t j =25
lm2940 linear integrated circuit unisonic technologies co., ltd 9 of 11 www.unisonic.com.tw qw-r102-016.j ? typical characteristics (cont.) output voltage (v) output voltage (v) output voltage (v) output voltage (v) output voltage (v) output voltage (v)
lm2940 linear integrated circuit unisonic technologies co., ltd 10 of 11 www.unisonic.com.tw qw-r102-016.j ? typical characteristics (cont.) 1100 output impedance 1k 0.02 0.05 0.01 10 10k 100k 0.10 0.50 1.00 10.00 frequency (hz) 1m v in =10v v out =5 v c out =22 f io ut =50ma 0 400 200 600 0.01 0.1 1 output current (ma) 800 1000 10 100 output capacitor esr -30 -10 0 0 -20 10 20 -5 5 10 input voltage (v) 30 40 15 20 25 output at voltage extremes r out =100 v out =10v -30 -10 0 0 -20 10 20 -4 4 8 input voltage (v) 30 40 12 16 20 output at voltage extremes r out =100 -30 -10 0 0 -20 10 20 -5 5 10 input voltage (v) 30 40 15 20 25 output at voltage extremes r out =100 stable region c out =22 f -40 0 40 80 0 1.0 temperature ( ) 120 160 2.0 3.0 peak output current v in =14v 5.00 2.00 0.20 v out =12v v out =15v v out =5v
lm2940 linear integrated circuit unisonic technologies co., ltd 11 of 11 www.unisonic.com.tw qw-r102-016.j ? typical characteristics (cont.) 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 life support appliances, devices or systems where malfunction of these products can be reasonably expected 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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