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?2011 fairchild semiconductor corporation www.fairchildsemi.com rev. 1.0.8 features ? programmable output voltage to 36 volts ? low dynamic output impedance 0.2 typical ? sink current capability of 1.0 to 100ma ? equivalent full-range te mperature coefficient of 50ppm/ c typical ? temperature compensated for operation over full rated operating temperature range ? low output noise voltage ? fast turn-on response description the lm431a/lm431b/lm431c are three terminal output adjustable regulators with thermal stability over operating temperature range. the output voltage can be set any value between v ref (approximately 2.5 volts) and 36 volts with two external resistors. these devices have a typical dynamic output impedance of 0.2 . active output circuit provides a sharp turn-on charact eristic, making these devices excellent replacement for zener diodes in many applications. to-92 8-dip 8-sop 1. ref 2. anode 3. cathode 1 1 1 1.cathode 2.3.6.7.anode 4.5.nc 8.ref 1.cathode 2.3.4.5.7.nc 6.anode 8.ref internal block diagram cathode anode reference cathode (k) anode (a) reference (r) 2.5 vref + - lm431a/lm431b/lm431c programmable shunt regulator
lm431a/lm431b/lm431c 2 absolute maximum ratings (operating temperature range applies unless otherwise specified.) recommended operating conditions parameter symbol value unit cathode voltage v ka 37 v cathode current range (continuous) i ka -100 ~ +150 ma reference input current range i ref -0.05 ~ +10 ma power dissipation m, z suffix package n suffix package p d 770 1000 mw operating temperature range lm431xc t opr -25 ~ +85 c lm431xi -40 ~ +85 c junction temperature t j 150 c storage temperature range t stg -65 ~ +150 c parameter symbol min typ max unit cathode voltage v ka v ref -36v cathode current i ka 1.0 - 100 ma
lm431a/lm431b/lm431c 3 electrical characteristics (t a = +25 c, unless otherwise specified) note1 ? lm431 x c : t min = -25 c, t max = +85 c ? lm431 x i : t min = -40 c, t max = +85 c parameter symbol conditions lm431a lm431b lm431c unit min. typ. max. min. typ. max. min. typ. max. reference input voltage v ref v ka = v ref , i ka =10ma 2.450 2.500 2.550 2.470 2.495 2.520 2.482 2.495 2.508 v deviation of reference input voltage over- temperature v ref / t v ka =v ref , i ka =10ma t min t a t max - 4.5 17 - 4.5 17 - 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 - -1.0 -2.7 - -1.0 -2.7 mv/v v ka =36v- 10v - -0.5 -2.0 - -0.5 -2.0 - -0.5 -2.0 reference input current i ref i ka =10ma, r 1 =10k ,r 2 = - 1.5 4 - 1.5 4 - 1.5 4 a deviation of reference input current over full temperature range i ref / t i ka =10ma, r 1 =10k ,r 2 = t a =full range - 0.4 1.2 - 0.4 1.2 - 0.4 1.2 a minimum cathode cur- rent for regulation i ka(min) v ka =v ref - 0.45 1.0 - 0.45 1.0 - 0.45 1.0 ma off - stage cathode current i ka(off) v ka =36v, v ref =0 - 0.05 1.0 - 0.05 1.0 - 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 - 0.15 0.5 - 0.15 0.5
lm431a/lm431b/lm431c 4 test circuits figure 1. test circuit for v ka =v ref figure 2. test circuit for v ka v ref lm431a/b/c lm431a/b/c lm431a/b/c figure 3. test circuit for l ka(off)
lm431a/lm431b/lm431c 5 typical performan ce characteristics figure 4. cathode current vs. cathode voltage figure 5. cathode current vs. cathode voltage figure 6. change in reference input voltage vs. cathode voltage figure7. dynamic impedance frequency figure 8. small signal voltag e amplification vs. frequency figure 9. pulse response
lm431a/lm431b/lm431c 6 typical performan ce characteristics (continued) 100p 1n 10n 100n 1 [ 10 0 20 40 60 80 100 120 140 d c b a a v ka = vref b v ka = 5.0 v @ i k = 10 ma c v ka = 10 v @ i k = 10 ma d v ka = 15 v @ i k = 10 ma t a = 25 o c i k , cathode current(ma) c l , load capacitance figure 10. stability boundary conditions stable stable
lm431a/lm431b/lm431c 7 typical application v o 1 r 1 r 2 ------ - + ?? ?? v ref = lm431a/b/c v o v ref 1 r 1 r 2 ------ - + ?? ?? = lm431a/b/c lm7805/mc7805 v o 1 r 1 r 2 ------ - + ?? ?? v ref = lm431a/b/c lm431a/b/c lm431a/b/c figure 11 . shunt regulator figure 12 . output control for minal fixed regulator three- te r - - figure 13. high current shunt regulator figure 14. current limit or current source figure 15. constant-current sink
lm431a/lm431b/lm431c 8 mechanical dimensions package dimensions in millimeters 0.46 0.10 1.27typ (r2.29) 3.86max [1.27 0.20 ] 1.27typ [1.27 0.20 ] 3.60 0.20 14.47 0.40 1 .02 0.10 (0.25) 4.58 0.20 4.58 +0.25 ?.15 0.38 +0.1 0 ?.0 5 0.38 +0.10 ?.05 to-92
lm431a/lm431b/lm431c 9 mechanical dimensions (continued) package dimensions in millimeters 4.92 0.20 0.194 0.008 0.41 0.10 0.016 0.004 1.27 0.050 5.72 0.225 1.55 0.20 0.061 0.008 0.1~0.25 0.004~0.001 6.00 0.30 0.236 0.012 3.95 0.20 0.156 0.008 0.50 0.20 0.020 0.008 5.13 0.202 max #1 #4 #5 0~8 #8 0.56 0.022 () 1.80 0.071 max0.10 max0.004 max min + 0.10 -0.05 0.15 + 0.004 -0.002 0.006 8-sop
lm431a/lm431b/lm431c 10 mechanical dimensions (continued) package dimensions in millimeters 8-dip 6.40 0.20 3.30 0.30 0.130 0.012 3.40 0.20 0.134 0.008 # 1 # 4#5 #8 0.252 0.008 9.20 0.20 0.79 2.54 0.100 0.031 ( ) 0.46 0.10 0.018 0.004 0.060 0.004 1.524 0.10 0.362 0.008 9.60 0.378 max 5.08 0.200 0.33 0.013 7.62 0~15 0.300 max min 0.25 +0.10 ?.05 0.010 +0.004 ?.002
lm431a/lm431b/lm431c 11 ordering information product number output voltage tolerance package operating temperature lm431ccz 0.5% to-92 -25 ~ +85 c lm431ccm 8-sop lm431bcz 1% to-92 lm431bcm 8-sop lm431acn 2% 8-dip lm431acz to-92 lm431acm 8-sop lm431ciz 0.5% to-92 -40 ~ +85 c lm431cim 8-sop lm431biz 1% to-92 lm431bim 8-sop lm431aiz 2% to-92 lm431aim 8-sop
lm431a/lm431b/lm431c 2/16/11 0.0m 001 stock#ds400300 ? 2011 fairchild semiconductor corporation life support policy fairchild?s products are not authorized for use as critical components in life support devices or systems without the express written approval of the president of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain lif e, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. a critical component in an y component of a life support device or system whose fa ilure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com disclaimer fairchild semiconductor reserves the right to make changes with out further notice to any products herein to improve re liability, function or design. fairchild does not assume any liability arising out of the applic ation or use of any product or circuit described herein; neither does it convey any license under its pat ent rights, nor the rights of others.

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