unisonic technologies co., ltd ll431 linear integrated circuit www.unisonic.com.tw 1 of 5 copyright ? 2011 unisonic technologies co., ltd qw-r121-020,e programmable precision reference ? description the utc ll431 is a three-terminal adjustable regulator with a guaranteed thermal stability over applicable temperature ranges. the output voltage may be set to any value between v ref (approximately 2.5v) and 36 v with two external resistors. it can be used in provides very wide applications including shunt regulator, series regulator, switch ing regulator, voltage reference and others. ? features *programmable output voltage to 36v. *low dynamic output impedance 0.2 . *sink current capability of 1.0 to 100ma. *equivalent full-range temperature coefficient of 50ppm/ c typical for operation over full rated operating temperature range. to-92 1 sop-8 sot-89 sot-25 1 3 5 2 4 1 sot-23 1 3 2 ? ordering information ordering number package pin assignment packing lead free halogen free 1 2 3 4 5 6 7 8 ll431k-ab3-r ll431g-ab3-r sot-89 r a k - - - - - tape reel ll431k-ae3-r ll431g-ae3-r sot-23 k r a - - - - - tape reel LL431NSL-AE3-R ll431nsg-ae3-r sot-23 r k a - - - - - tape reel ll431k-af5-r ll431g-af5-r sot-25 x x k r a - - - tape reel ll431k-s08-r ll431g-s08-r sop-8 kaaxxaa r t ape reel ll431k-t92-b ll431g-t92-b to-92 r a k - - - - - tape box ll431k-t92-k ll431g-t92-k to-92 r a k - - - - - bulk ll431k-t92-r ll431g-t92-r to-92 r a k - - - - - tape reel note: pin code: k: cathode a: anode r: reference x: no connection
ll431 linear integrated circuit u nisonic technologies co., ltd 2 of 5 www.unisonic.com.tw qw-r121-020,e ? marking package marking sot-23 sot-23 (ll431ns) sot-25 3 2 1 ll431 5 4 g: halogen free k: lead free ? block diagram 2.5v v ref cathode anode reference cathode (k) anode(a) reference (r)
ll431 linear integrated circuit u nisonic technologies co., ltd 3 of 5 www.unisonic.com.tw qw-r121-020,e ? absolute maximum ratings (operating temperature range applies unless otherwise specified) parameter symbol ratings unit cathode voltage v ka 37 v cathode current range(continuous) i ka -100 ~ +150 ma reference input current i ref -0.05 ~ +10 ma power dissipation sot-89 p d 500 mw sot-23/ sot-25 300 mw sop-8 600 mw to-92 770 mw junction temperature t j +150 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 functiona l device operation is not implied. ? recommended operating conditions parameter symbol ratings unit cathode voltage v ka v ref ~ 36 v cathode current i ka 1 ~ 100 ma ? electrical characteristics (t c = 25 , unless otherwise specified.) parameter symbol test conditions min typ max unit reference input voltage v ref v ka =v ref ,i ka =10ma 0.5% 2.483 2.495 2.507 v deviation of reference input voltage over temperature v ref / t v ka =v ref ,i ka =10ma 0 c Q t a Q 70 c 4.5 17 mv ratio of change in reference input voltage to the change in cathode voltage v ref / v ka i ka =10ma v ka =10v~v ref -1.0 -2.7 mv/v v ka =36v~10v -0.5 -2.0 reference input current i ref i ka =10ma, r1=10k , r2= 1.5 4 a deviation of referenc e input current over full temperature range i ref / t i ka =10ma, r1=10k , r2= t a =full temperature 0.4 1.2 a minimum cathode current for regulation i ka ( min ) v ka =v ref 0.15 ma off-state cathode current i ka ( off ) v ka =36v, v ref =0 0.05 1.0 a dynamic impedance z ka v ka =v ref , i ka =1 to 100ma f 1.0khz 0.15 0.5
ll431 linear integrated circuit u nisonic technologies co., ltd 4 of 5 www.unisonic.com.tw qw-r121-020,e ? test circuit for v ka =v ref for v ka R v ref for i ka(off) ? application circuit v in vo ut v ref utc ll431 r 1 r 2 v out =(1+r 1 /r 2 )*v ref v ref utc ll431 r1 r 2 v out =(1+r 1 /r 2 )*v ref utc7805 out in common v ref utc ll431 r 1 r 2 v out =(1+r 1 /r 2 )*v ref v in vo ut vo ut v in shutdown regulator output control of a three higher-current shunt regulator -terminal fixed regulator constant-current sink current limiting or current source
ll431 linear integrated circuit u nisonic technologies co., ltd 5 of 5 www.unisonic.com.tw qw-r121-020,e typical characteristics -1 1 023 -200 0 400 200 600 800 -2 cathode voltage (v) cathode current ( a) 0 -5 -10 -15 -20 -25 -30 -35 -40 01234567 0 1 2 3 4 5 6 7 time ( s) input and output voltage (v) pulse response t a =25c change in reference input voltage (mv) i ka =100ma t a =25c t a =25c v ka =v ref change in reference input voltage vs. cathode voltage cathode current vs. cathode voltage i ka(min) -50 0 5 10 15 20 25 30 35 40 -2 -1 0 1 2 3 -100 -75 -50 -25 0 25 50 75 100 125 cathode voltage (v) cathode current (ma) cathode current vs. cathode voltage 150 t a =25c v ka =v ref -1 -1 cathode voltage (v) 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 written 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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