unisonic technologies co., ltd LM317A linear integrated circuit www.unisonic.com.tw 1 of 5 copyright ? 2014 unisonic technologies co., ltd qw-r101-026.e medium current 1.2v to 37v adjustable voltage regulator ? description the utc LM317A is an adjustable 3-terminal positive voltage regulator, designed to supply 1.5a of output current with voltage adjustable from 1.2v ~ 37v. ? features * output voltage adjust able from 1.2v ~ 37v * output current in excess of 1.5a * internal thermal overload protection * internal short circui t current limiting * output transistor sa fe area compensation to-263 1 to-220 1 sot-223 to-252 1 to-220f2 1 1 ? ordering information ordering number package pin assignment packing lead free halogen free 1 2 3 LM317Al-aa3-r LM317Ag-aa3-r sot-223 adj o i tape reel LM317Al-ta3-t LM317Ag-ta3-t to-220 adj o i tube LM317Al-tf2-t LM317Ag-tf2-t to-220f2 adj o i tube LM317Al-tn3-r LM317Ag-tn3-r to-252 adj o i tape reel LM317Al-tq2-r LM317Ag-tq2-r to-263 adj o i tape reel LM317Al-tq2-t LM317Ag-tq2-t to-263 adj o i tube note: pin assignment: i: v in o: v out ? marking sot-223 to-220 / to-220f2 / to-252 / to-263
LM317A linear integrated circuit unisonic technologies co., ltd 2 of 5 www.unisonic.com.tw qw-r101-026.e ? block diagram
LM317A linear integrated circuit unisonic technologies co., ltd 3 of 5 www.unisonic.com.tw qw-r101-026.e ? absolute maximum ratings parameter symbol ratings unit input-output voltag e differential v in -v out 40 v power dissipation p d internally limited junction temperature t j +125 c operating temperature 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 ratings unit junction to ambient sot-223 ja 140 c/w to-220/to-220f2 50 c/w to-252 103 c/w to-263 62.5 c/w junction to case sot-223 jc 23.5 c/w to-220/to-263 5 c/w to-220f2 8 c/w to-252 12 c/w ? electrical characteristics (v in -v out =5v, i out =0.5a, p max =20w, ta=25c, unless otherwise specified.) parameter symbol test conditions min typ max unit line regulation ? v out /v out 3v v in -v out 40v, i out =100ma 0.01 0.04 %/v load regulation ? v out 10ma i out 1.5a v out 5v 5 25 mv v out 5v 0.1 0.5 % adjustable pin current i adj 50 100 a adjustable pin current change ? i adj 3v v in -v out 40v, 10ma i out 500ma 0.2 5 a reference voltage v ref 3v v in -v out 40v, 10ma i out 1.5a, p d p max 1.20 1.25 1.30 v temperature stability t min t j t ma x 0.7 %/v out minimum load current for regulation i l ( min ) v in -v out =40v 4.5 ma maximum output current i o(max) v in -v out =40v, p d p max 0.3 0.4 a v in -v out =15v, p d p max 1.5 2.2 a rms noise vs. %of v out en 10h z f 10kh z 0.003 %/v out ripple rejection rr v out =10v,f=120h z c adj =0 65 db c adj =10 f 66 80 db
LM317A linear integrated circuit unisonic technologies co., ltd 4 of 5 www.unisonic.com.tw qw-r101-026.e ? application circuits 1 2 3 v out r1 r2 v in c1 0.1 f co 1 f i adj utc LM317A v out =1.25v(1+r2/r1)+i adj r2 c1 is required when regulator is located an appreciated distance from power supply. co is needed to improve transient response. 1 2 3 v out v in d1 1n4002 720 120 1k 1 f ttl level signal utc LM317A fig.1 programmable voltage regulator fig.2 regulator with on-off control ma 100 < i < ma 5 2 r + 1 r v 25 . 1 = i + ) 2 r + 1 r v ( = i 1 r v 25 . 1 = i + ) 1 r v ( = i out adj ref ) min ( o adj ref ) max ( o fig.3 soft start application fig.4 constant current application
LM317A linear integrated circuit unisonic technologies co., ltd 5 of 5 www.unisonic.com.tw qw-r101-026.e ? typical characteristics output voltage deviation, ? v out (%) adjustment current, i adj ( a) min output current, i out (ma) output current, i out (a) 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 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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