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rev. a/dx 2007 - 06 - 04 lm431l lm431la lm431lb shunt re g ulator taitron components incorporated www.taitroncomponents.com page 1 of 13 tel: (800) - taitron (800) - 824 - 8766 (661) - 257 - 6060 fax: (800)-taitfax (800)-824-8329 (661)-257-6415 shunt regulator general description ? the lm431 series ics are low voltage three-terminal programmable shunt regulators with guaranteed thermal stability over a full operation range. these monolithic ics voltage reference operate as a low temperature coefficient zener which is programmable from vref to 18v with two external resistors. these devices exhibit a wide operating current range of 80a to 50/100ma with a typical dynamic impedance of 0.05 to 0.22 ? . the characteristics of these references make them excellent replacements for zener diodes in many applications such as digital voltmeters, power supplies and op amp circuitry ? the lm431l precision reference is offered in three voltage tolerance for v ref =1.240v: 1.5%, 1.0% and 0.5%. ? these ics are available in 4 packages: to-92, sot-23, sot-23-5 and sot-89. . . features applications ? programmable precise output voltage from 1.24v to 16/18v ? high stability under capacitive load ? low temperature deviation ? low dynamic output impedance: 0.05 to 0.22 ? typical ? operating current from 80a to 50/100ma. ? low output noise voltage ? rohs compliance sot-89 sot-23-5 sot-23 ? graphic card ? pc motherboard ? voltage adapter ? switching power supply ? charger to-92
shunt regulator rev. a/dx 2007 - 06 - 04 lm431l www.taitroncomponents.com page 2 of 13 ordering information pin configuration outline: z to-92 outline: n sot-23 outline: n5 sot-23-5 outline: k sot-89
shunt regulator rev. a/dx 2007 - 06 - 04 lm431l www.taitroncomponents.com page 3 of 13 block diagram symbols absolute maximum ratings (ta=25 c) (full operating ambient temperature range applies unless otherwise noted.) symbol description lm431l lm431la lm431lb unit v ka cathode voltage 16 18 v i ka cathode current range (continuous) 50 -100 ~ +100 ma i ref reference input current range (continuous) 3 10 ma t j operating junction temperature 150 c t opr operating temperature range -40 ~ 85 -40 ~ 125 c t stg storage temperature range -65 ~ 150 c z:to-92 700 770 n:sot-23 350 370 n5:sot-23-5 550 370 p d power dissipation k: sot-89 - 770 mw z:to-92 180 150 n:sot-23 360 330 n5:sot-23-5 230 250 rth ja package thermal impedance k: sot-89 - 50 c/w
shunt regulator rev. a/dx 2007 - 06 - 04 lm431l www.taitroncomponents.com page 4 of 13 electrical characteristics (t a =25oc, unless otherwise specified) lm431l lm431la lm431lb symbol description min. typ. max. min. typ. max. min. typ. max. unit test circuit conditions v ref reference input voltage 1.222 1.240 1.258 1.228 1.240 1.252 1.234 1.240 1.246 v fig.1 v ka =v ref ,i ka =10ma 0-70 c - - - - 2 1- - 2 10 -40-85 c - 7.0 20 - 3 10 - 3 10 ? v ref reference input voltage deviation -40-125 c - - - - 4 15 - 4 15 mv fig.1 (note1) v ka =v ref ,i ka =10ma ? v ref/ ? v ka ratio of change in reference input voltage to change in cathode to anode voltage - -0.6 -1.5 - -0.5 -1.5 - -0.5 -1.5 mv/v fig.2 ika= 10ma ? v ka = v ka(max) ~v ref i ref reference input current ta=25 c - 0.15 0.3 - 0.15 0.4 - 0.15 0.4 a fig.2 i ka =10ma, r1=10k ? , r2= ? i ref reference input current deviation over temperature range - 0.05 0.08 - 0.1 0.4 - 0.1 0.4 a fig.2 i ka =10ma, r1=10k ? , r2= i min min. cathode current for regulation - 55 80 - 55 80 - 55 80 a fig.1 v ka =v ref - 2.6 1000 - 40 100 - 40 100 v ka = v ka(max) , v ref =0v i off off-state cathode current - - - - 10 50 - 10 50 na fig.3 v ka =6v, v ref =0v z ka dynamic impedance - 0.22 0.4 - 0.05 0.15 - 0.05 0.15 ? fig.1 (note2) v ka =v ref , i ka =1.0ma~ i ka(max) , f 1.0khz fig.1- test circuit for v ka =v ref fig.2- test circuit for v ka >v ref
shunt regulator rev. a/dx 2007 - 06 - 04 lm431l www.taitroncomponents.com page 5 of 13 note1: note2: fig.3- test circuit for i off
shunt regulator rev. a/dx 2007 - 06 - 04 lm431l www.taitroncomponents.com page 6 of 13 fig.4- v ref - t j junction temperature t j ( c) fig.6- i k ? v ka (1) cathode volta g e v k a ( v ) fig.5- i ref - t j junction temperature t j ( c) typical characteristics curves reference input voltage v ref ( v ) cathode current i k ( ma ) fig.7- i k ? v ka (2) cathode voltage v ka (v) reference input current i ref ( na ) cathode current i k ( a )
shunt regulator rev. a/dx 2007 - 06 - 04 lm431l www.taitroncomponents.com page 7 of 13 fig.8- g vo - f frequency f (hz) fig.9- pulse response time t (s) voltage swing (v) fig.11- z ka - f frequency f (hz) open loop voltage gain g vo (db) dynamic impedance z ka ( ? ) fig.10- ? v ref - t j junction temperature t j ( c) ? v ref / ? v ka (mv/v )
shunt regulator rev. a/dx 2007 - 06 - 04 lm431l www.taitroncomponents.com page 8 of 13 typical application fig.12-shunt regulator fig.13- high current shunt regulator fig.14- current source of current limit
shunt regulator rev. a/dx 2007 - 06 - 04 lm431l www.taitroncomponents.com page 9 of 13 typical application (continued) fig.15- precision 5v 1a regulator fig.16- pwm converter with reference
shunt regulator rev. a/dx 2007 - 06 - 04 lm431l www.taitroncomponents.com page 10 of 13 device marking code circuit tolerance sot-23 (n) sot-23-5 (n5) sot-89 (k) blank 1.5% 24a 24a n/a a 1.0% ea7 e6a e41b lm431l b 0.5% ea6 e5a e41a dimensions in inches (mm) to-92
shunt regulator rev. a/dx 2007 - 06 - 04 lm431l www.taitroncomponents.com page 11 of 13 sot-23 sot-23-5
shunt regulator rev. a/dx 2007 - 06 - 04 lm431l www.taitroncomponents.com page 12 of 13 sot-89
shunt regulator rev. a/dx 2007 - 06 - 04 lm431l www.taitroncomponents.com page 13 of 13 how to contact us: us headquarters 28040 west harrison parkaway, valencia, ca 91355-4162 tel: (800) taitron (800) 824-8766 (661) 257-6060 fax: (800) taitfax (800) 824-8329 (661) 257-6415 email: taitron@taitroncomponents.com http:// www.taitroncomponents.com taitron components mexico, s.a .de c.v. boulevard central 5000 interior 5 parque industrial atitalaquia, hidalgo c.p. 42970 mexico tel: +52-55-5560-1519 fax: +52-55-5560-2190 taitron componets incorporated e representa??es do brasil ltda rua domingos de morais, 2777, 2.andar, sala 24 sade - s?o paulo-sp 04035-001 brazil tel: +55-11-5574-7949 fax: +55-11-5572-0052 taitron componets incorporated, shanghai representative office cross region plaza, 899 lingling road, suite 18c, shanghai, 200030, china tel: +86-21-5424-9942 fax: +86-21-5424-9931

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