unisonic technologies co., ltd tl431l linear integrated circuit www.unisonic.com.tw 1 of 5 copyright ? 2008 unisonic technologies co., ltd qw-r103-014.f programmable precision reference ? description the utc tl431l 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 20v with two external resistors. it provides very wide applications, including shunt regulator, series regulator, switching regulator, voltage reference and others. ? features *programmable output voltage to 20v. *low dynamic output impedance 0.2 . *sink current capability of 1.0 ~ 100ma. *equivalent full-range temperature coefficient of 50ppm/ c typical for operation over full rated operating temperature range. ? ordering information ordering number pin assignment normal lead free halogen free 12345678 package packing tl431l-ab3-r TL431LK-AB3-R tl431lg-ab3-r r a k - - - - - sot-89 tape reel tl431l-ae3-r tl431lk-ae3-r tl431lg-ae3-r k r a - - - - - sot-23 tape reel tl431l-af5-r tl431lk-af5-r tl431lg-af5-r x x k r a - - - sot-25 tape reel tl431l-s08-r tl431lk-s08-r tl431lg-s08-r kaaxxaar sop-8 t ape reel tl431l-sm1-r tl431lk-sm1-r tl431lg-sm1-r kxxxxaxr msop-8 t ape reel tl431l-sm1-t tl431lk-sm1-t tl431lg-sm1-t kxxxxaxr msop-8 t ube tl431l-t92-b tl431lk-t92-b tl431lg-t92-b r a k - - - - - to-92 tape box tl431l-t92-k tl431lk-t92-k tl431lg-t92-k r a k - - - - - to-92 bulk tl431l-t92-r tl431lk-t92-r tl431lg-t92-r r a k - - - - - to-92 tape reel note: pin code: k: cathode a: anode r: reference x: no connection ? marking (sot-23/sot-25) sot-23 sot-25
tl431l linear integrated circuit unisonic technologies co., ltd 2 of 5 www.unisonic.com.tw qw-r103-014.f ? block diagram
tl431l linear integrated circuit unisonic technologies co., ltd 3 of 5 www.unisonic.com.tw qw-r103-014.f ? absolute maximum ratings (operating temperature range applies unless otherwise specified) parameter symbol ratings unit cathode voltage v ka 20 v cathode current range (continuous) i ka -100 ~ +150 ma reference input current range i ref -0.05 ~ +10 ma operating junction temperature t j 150 c operating ambient temperature t opr 0 ~ +70 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 an d functional device operat ion is not implied. ? recommended operating conditions parameter symbol min typ max unit cathode voltage v ka v ref 20 v cathode current i ka 1 100 ma ? electrical characteristics (ta=25 c, unless otherwise specified) parameter symbol test conditions min typ max unit reference input voltage v ref v ka =v ref , i ka =10ma 2.450 2.50 2.550 v deviation of reference input voltage over temperature (note 1) v ref / t v ka =v ref , i ka =10ma 0 t a 70 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 v ka =20v~10v -1.0 -0.5 -2.7 -2.0 mv/v reference input current i ref i ka =10ma, r1=10k , r2= 1.5 4 a deviation of refer ence 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 0.45 1.0 ma off-state cathode current i ka(off) v ka =20v, v ref =0 0.05 1.0 a dynamic impedance z ka v ka =v ref , i ka =1 ~ 100ma f 1.0khz 0.15 0.5 remark: reference voltage of 1% tolerance is also available per customer?s request.
tl431l linear integrated circuit unisonic technologies co., ltd 4 of 5 www.unisonic.com.tw qw-r103-014.f ? typical characteristics -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 ta=25 v ka =v ref -1 1 023 -200 0 400 200 600 800 -2 cathode voltage (v) cathode current (ma) cathode current vs. cathode voltage i ka(min) 0 5 10 15 20 25 30 35 40 0 -5 -10 -15 -20 -25 -30 -35 -40 cathode voltage (v) change in reference input voltage (mv) change in reference input voltage vs. cathode voltage i ka =100ma ta=25 0 1234567 0 1 2 3 4 5 6 7 time ( s) input and output voltage (v) pulse response ta=25 2 10 1 10 -1 10 0 10 7 10 6 10 5 10 10 4 10 3 impedance ( ) frequency (hz) dynamic impedance vs. frequency ta=25 i ka =0ma ~ 100ma -10 0 10 20 30 40 50 60 70 7 10 6 10 5 10 10 4 10 3 small signal voltage amplification vs. frequency voltage amplification (db) frequency (hz) ta=25 i ka =10ma ta=25 v ka =v ref
tl431l linear integrated circuit unisonic technologies co., ltd 5 of 5 www.unisonic.com.tw qw-r103-014.f ? test circuit ? application circuit constant-current sink current limiting or current source v in v out utc tl431l rs r s =v ref /r cl r cl i out v in v out utc tl431l rs i out i out =v ref /r s 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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