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lm431a / lm431b / lm431c ? prog rammable shunt regulator ? 2003 fairchild semiconductor corporation www.fairchildsemi.com lm431a / lm431b / lm431c rev. 1.2.0 1 june 2013 lm431a / lm431b / lm431c programmable shunt regulator features ? programmable output voltage to 36 v ? low dynamic output impedance: 0.2 (typical) ? sink current capability: 1.0 to 100 ma ? equivalent full-range temperature coefficient of 50 ppm/c (typical) ? temperature compensated for operation over full rated operating temperature range ? low output noise voltage ? fast turn-on response ordering information part number operating temperature range output voltage tolerance top mark package packing method lm431ccz -25 ~ +85 c 0.5% lm431ccz to-92 bulk lm431ccmx lm431ccm 8-soic tape and reel lm431bczx 1% lm431bcz to-92 tape and reel lm431bczxa lm431bcz to-92 ammo LM431BCMX lm431bcm 8-soic tape and reel lm431acz 2% lm431acz to-92 bulk lm431aczx lm431acz to-92 tape and reel lm431acmx lm431acm 8-soic tape and reel lm431cimx -40 ~ +85 c 0.5% lm431cim 8-soic tape and reel lm431bizx 1% lm431biz to-92 tape and reel lm431aiz 2% lm431aiz to-92 bulk lm431aimx lm431aim 8-soic tape and reel description the lm431a / lm431b / lm431c are three-terminal out- put adjustable regulators with thermal stability over the full operating temperature range. the output voltage can be set to any value between v ref (approximately 2.5 v) and 36 v with two external resistors. these devices have a typical dynamic output impedance of 0.2 . active out- put circuit provides a sharp turn-on characteristic, mak- ing these devices excellent replacements for zener diodes in many applications. to-92 8-soic 1. ref 2. anode 3. cathode 1 1 1.cathode 2.3.6.7.anode 4.5.nc 8.ref
lm431a / lm431b / lm431c ? prog rammable shunt regulator ? 2003 fairchild semiconductor corporation www.fairchildsemi.com lm431a / lm431b / lm431c rev. 1.2.0 2 block diagram figure 1. block diagram absolute maximum ratings stresses exceeding the absolute maximum ratings may damage the device. the device may not function or be opera- ble above the recommended operating conditions and stressing the parts to these levels is not recommended. in addi- tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. the absolute maximum ratings are stress ratings only. values are at t a = 25c unless otherwise noted. recommended operating conditions the recommended operating conditions table defines the conditions for actual device operation. recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. fairchild does not recommend exceeding them or designing to absolute maximum ratings. symbol parameter value unit v ka cathode voltage 37 v i ka cathode current range (continuous) -100 ~ +150 ma i ref reference input current range -0.05 ~ +10 ma p d power dissipation to-92, 8-soic packages 770 mw r ja thermal resistance, junction to ambient to-92, 8-soic packages 160 c/w t opr operating temperature range lm431xc -25 ~ +85 c operating temperature range lm431xi -40 ~ +85 c t j junction temperature 150 c t stg storage temperature range -65 ~ +150 c symbol parameter min. max. unit v ka cathode voltage v ref 36 v i ka cathode current 1.0 100 ma cathode anode reference cathode (k) anode (a) reference (r) 2.5 ref + -
lm431a / lm431b / lm431c ? prog rammable shunt regulator ? 2003 fairchild semiconductor corporation www.fairchildsemi.com lm431a / lm431b / lm431c rev. 1.2.0 3 electrical characteristics values are at t a = 25c unless otherwise noted. note: 1. lm431xc: t min = -25c, t max = +85c. lm431xi: t min = -40c, t max = +85c. symbol parameter conditions lm431a lm431b lm431c unit min. typ. max. min. typ. max. min. typ. max. v ref reference input voltage v ka = v ref , i ka = 10 ma 2.450 2.500 2.550 2.470 2.495 2.520 2.482 2.495 2.508 v v ref / t deviation of reference input voltage over- temperature v ka = v ref , i ka =10 ma t min t a t max (1) 4.5 17.0 4.5 17.0 4.5 17.0 mv v ref / v ka ratio of change in reference input voltage to the change in cathode voltage i ka = 10 ma 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 i ref reference input current i ka = 10 ma, r1 =10 k , r2 = 1.5 4.0 1.5 4.0 1.5 4.0 a i ref / t deviation of reference input current over full temperature range i ka = 10 ma, r1 = 10 k , r2 = t a = full range 0.4 1.2 0.4 1.2 0.4 1.2 a i ka(min) minimum cathode cur-rent for regulation v ka = v ref 0.45 1.00 0.45 1.00 0.45 1.00 ma i ka(off) off - stage cathode current v ka = 36 v, v ref = 0 0.05 1.00 0.05 1.00 0.05 1.00 a z ka dynamic impedance v ka = v ref , i ka =1 to 100 ma f 1.0 khz 0.15 0.50 0.15 0.50 0.15 0.50
lm431a / lm431b / lm431c ? prog rammable shunt regulator ? 2003 fairchild semiconductor corporation www.fairchildsemi.com lm431a / lm431b / lm431c rev. 1.2.0 4 test circuits figure 2. test circuit for v ka = v ref figure 3. test circuit for v ka v ref figure 4. test circuit for i ka(off) lm431 lm431 lm431
lm431a / lm431b / lm431c ? prog rammable shunt regulator ? 2003 fairchild semiconductor corporation www.fairchildsemi.com lm431a / lm431b / lm431c rev. 1.2.0 5 typical performance characteristics figure 5. cathode current vs. cathode voltage figure 6. cathode current vs. cathode voltage figure 7. change in reference input voltage vs. cathode voltage figure 8. dynamic impedance frequency figure 9. small signal voltage amplification vs. frequency figure 10. pulse response
lm431a / lm431b / lm431c ? prog rammable shunt regulator ? 2003 fairchild semiconductor corporation www.fairchildsemi.com lm431a / lm431b / lm431c rev. 1.2.0 6 typical performance characteristics (continued) figure11. stability boundary conditions 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
lm431a / lm431b / lm431c ? prog rammable shunt regulator ? 2003 fairchild semiconductor corporation www.fairchildsemi.com lm431a / lm431b / lm431c rev. 1.2.0 7 typical application figure 12 . shunt regulator figure 13. output control for three- terminal fixed regulator figure 14. high-current shunt regulator figure 15. current limit or current source figure 16. constant-current sink v o 1 r 1 r 2 ------- + ?? ?? ?? v ref = lm431 v o v ref 1 r 1 r 2 ------- + ?? ?? ?? = lm431 v o 1 r 1 r 2 ------- + ?? ?? ?? v ref = lm431 lm431 lm431
lm431a / lm431b / lm431c ? prog rammable shunt regulator ? 2003 fairchild semiconductor corporation www.fairchildsemi.com lm431a / lm431b / lm431c rev. 1.2.0 8 physical dimensions figure 17. 3-lead, to-92, molded, standard straight lead package drawings are provided as a service to customers considering fairchild components. drawings may change in any manner without notice. please note the revision and/or date on the drawing and contact a fairchild semiconductor representative to ver ify or obtain the most recent revision. package specifications do not expand the terms of fairchild?s worldwide terms and conditions, specifically the warranty therein, which covers fairchild products. always visit fairchild semiconductor?s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/ . d to-92 bulk type d) drawing filename: mkt-za03drev3.
lm431a / lm431b / lm431c ? prog rammable shunt regulator ? 2003 fairchild semiconductor corporation www.fairchildsemi.com lm431a / lm431b / lm431c rev. 1.2.0 9 physical dimensions (continued) figure 18. 3-lead, to-92, molded, 0.200 in line spacing lead form package drawings are provided as a service to customers considering fairchild components. drawings may change in any manner without notice. please note the revision and/or date on the drawing and contact a fairchild semiconductor representative to ver ify or obtain the most recent revision. package specifications do not expand the terms of fairchild?s worldwide terms and conditions, specifically the warranty therein, which covers fairchild products. always visit fairchild semiconductor?s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/ . for current tape and reel specifications, visit fairchild semiconductor?s online packaging area: http://www.fairchildsemi.com/products/discrete/pdf/to92_tr.pdf . d d d
lm431a / lm431b / lm431c ? prog rammable shunt regulator ? 2003 fairchild semiconductor corporation www.fairchildsemi.com lm431a / lm431b / lm431c rev. 1.2.0 10 physical dimensions (continued) figure 19. 8-lead, soic, jedec ms 0-12, 0.150 inch narrow body package drawings are provided as a service to customers considering fairchild components. drawings may change in any manner without notice. please note the revision and/or date on the drawing and contact a fairchild semiconductor representative to ver ify or obtain the most recent revision. package specifications do not expand the terms of fairchild?s worldwide terms and conditions, specifically the warranty therein, which covers fairchild products. always visit fairchild semiconductor?s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/ . for current tape and reel specifications, visit fairchild semiconductor?s online packaging area: http://www.fairchildsemi .com/products/discrete/pdf/soic8_tr.pdf . 8 0 see detail a notes: unless otherwise specified a) this package conforms to jedec ms-012, variation aa. b) all dimensions are in millimeters. c) dimensions do not include mold flash or burrs. d) landpattern standard: soic127p600x175-8m. e) drawing filename: m08arev14 f) fairchild semiconductor. land pattern recommendation seating plane c gage plane x 45 detail a scale: 2:1 pin one indicator 4 8 1 b 5 a 5.60 0.65 1.75 1.27 6.20 5.80 3.81 4.00 3.80 5.00 4.80 (0.33) 1.27 0.51 0.33 0.25 0.10 1.75 max 0.25 0.19 0.36 0.50 0.25 r0.10 r0.10 0.90 0.40 (1.04) option a - bevel edge option b - no bevel edge 0.25 c b a 0.10 8-soic
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supersot -3 supersot -6 supersot -8 supremos ? syncfet sync-lock? ?* tinyboost tinybuck tinycalc tinylogic ? tinyopto tinypower tinypwm tinywire transic trifault detect truecurrent ? * p serdes uhc ? ultra frfet unifet vcx visualmax voltageplus xs? * trademarks of system general corporation, used under license by fairchild semiconductor. disclaimer fairchild semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function, or design. fairchild does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others. these specifications do not expand the terms of fairchilds worldwide terms and conditions, specifically the warranty therein, which covers these products. life support policy fairchilds products are not authorized for use as critical components in life support devices or systems without the express written approval 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 life, 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 any component of a life support, device, or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. anti-counterfeiting policy fairchild semiconductor corporation's anti-counterfeiting policy. fairchild's anti-counterfeiting policy is also stated on our external website, www.fairchildsemi.com, under sales support. counterfeiting of semiconductor parts is a growing problem in the industry. all manufacturers of semiconductor products are exp eriencing counterfeiting of their parts. customers who inadvertently purchase counterfeit parts experience many problems such as loss of brand reputation, substa ndard performance, failed applications, and increased cost of production and manufacturing delays. fairchild is taking strong measures to protect ourselv es and our customers from the proliferation of counterfeit parts. fairchild strongly encourages customers to purchase fairchild parts either directly from fa irchild or from authorized fairchild distributors who are listed by country on our web page cited above. products customers buy either from fairchild directly or fr om authorized fairchild distributors are genuine parts, have full traceability, meet fairchild's quality standards for handling and storage and provide access to fa irchild's full range of up-to-date technical and product information. fairchild and our authorized distributors will stand behind all warranties and will appropriately addr ess any warranty issues that may arise. fairchild will not provide any warranty coverage or other assistance for parts bought from unauthorized sources. fairchild is c ommitted to combat this global problem and encourage our customers to do their part in stopping this practice by buying direct or from authorized distributors . product status definitions definition of terms datasheet identification product status definition advance information formative / in design datasheet contains the design specifications for product development. specifications may change in any manner without notice. preliminary first production datasheet contains preliminary data; supplementary data will be published at a later date. fairchild semiconductor reserves the right to make changes at any time without notice to improve design. no identification needed full production datasheet contains final specifications. fairchild semiconductor reserves the right to make changes at any time without notice to improve the design. obsolete not in production datasheet contains specifications on a product that is discontinued by fairchild semiconductor. the datasheet is for reference information only. rev. i64 ?

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