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ap431/ap431a adjustable precision shunt regulator ap431/ap431a document number: ds31002 rev. 15 - 2 1 of 16 www.diodes.com june 2010 ? diodes incorporated features ? precision reference voltage ? ap431: 2.495v 1% ? ap431a: 2.495v 0.5% ? sink current capability: 200ma ? minimum cathode current for regulation: 300 a ? equivalent full-range temp coefficient: 30 ppm/oc ? fast turn-on response ? low dynamic output impedance: 0.2 ? ? programmable output voltage to 36v ? low output noise ? lead free packages: sot25, sc59, sc59r, sot89-3l and to92-3l ? sot23, sot23r, sot25, sc59, sc59r, sop-8l, sot89-3l, to92-3l: available in ?green? molding compound (no br, sb) ? lead free finish/ rohs compliant (note 1) description the ap431 and ap431a are 3-terminal adjustable precision shunt regulators with guarant eed temperature stability over the applicable extended commercial temperature range. the output voltage may be set at any level greater than 2.495v (v ref ) up to 36v merely by selecting two external resistors that act as a vo ltage divider network. these devices have a typical output impedance of 0.2 ? . active output circuitry provides very sharp turn-on characteristics, making these devices excellent improved replacements for zener diodes in many applications. the precise (+/-) 1% reference voltage tolerance of the ap431/ap431a make it possible in many applications to avoid the use of a variable resistor, consequently saving cost and eliminating drift and reliability problems associated with it. notes: 1. eu directive 2002/95/ec (rohs). all applicabl e rohs exemptions applied. please visit our website at http://www.diodes.com/products/lead_free.html . typical application circuit + + r2 r1 v out v in v out = (1+r1/r2)v ref precision regulator c in c out ap431
ap431/ap431a adjustable precision shunt regulator ap431/ap431a document number: ds31002 rev. 15 - 2 2 of 16 www.diodes.com june 2010 ? diodes incorporated pin assignments (1) sot25 (2) sop-8l 4ref 5 anode nc 1 cathode 3 nc 2 (top view) nc 5 4 18 6 7 3 2 anode anode cathode nc anode ref anode (top view) (3) sc59 (4) sc59r (top view) anode 1 3ref 2 cathode anode 1 2ref 3cathode (top view) (5) sot23 (6) sot23r (top view) anode 1 2cathode 3ref (top view) anode 1 2 cathode 3 ref (7) sot89-3l (8) to92-3l 1 2 3 anode cathode ref (top view) (top view) 1 ref 2 anode + + + 3 cathode
ap431/ap431a adjustable precision shunt regulator ap431/ap431a document number: ds31002 rev. 15 - 2 3 of 16 www.diodes.com june 2010 ? diodes incorporated functional block diagram ref (r) v ref + - anode (a) cathode (c) symbol cathode (c) ref (r) anode (a) absolute maximum ratings symbol parameter rating unit vcv cathode voltage +36 v i cc continuous cathode current -10 to +250 ma i ref reference input current 10 ma t op operating temperature -20 to +85 o c t st storage temperature -65 to +150 o c p d power dissipation (notes 2, 3) sot23(r) 400 mw sot25 550 mw sc59(r) 400 mw sop-8l 600 mw sot89-3l 800 mw to92-3l 780 mw notes: 2. t j , max =150c. 3. ratings apply to am bient temperature at 25c.
ap431/ap431a adjustable precision shunt regulator ap431/ap431a document number: ds31002 rev. 15 - 2 4 of 16 www.diodes.com june 2010 ? diodes incorporated electrical characteristics (t a = 25 o c, v + = +5.0v, unless otherwise stated) symbol parameter test conditions min typ. max unit v ref reference voltage v ka = v ref , i ka = 10ma (fig.1) ap431 ap431a 2.470 2.482 2.495 2.520 2.507 v v ref deviation of reference input voltage over temperature (note 4) v ka = v ref , i ka = 10ma, ta = full range (fig.1) ? 8.0 20 mv ? v ref ? v ka ratio of the change in reference voltage to the change in cathode voltage i ka = 10ma (fig. 2) v ka = v ref to10v ? -1.4 -2.0 mv/v v ka = 10v to 36v ? -1 -2 mv/v i ref reference input current r1 = 10k ,r2 = ? i ka = 10ma (fig. 2) ? 1.4 3.5 a i ref deviation of reference input current over temperature r1 = 10k ,r2 = ? i ka = 10ma ta = full range (fig. 2) ? 0.4 1.2 a i ka(min) minimum cathode current for regulation v ka = v ref (fig.1) ? 0.19 0.5 ma i ka ( off ) off-state current v ka = 36v, v ref = 0v (fig. 3) ? 0.1 1.0 a | z ka | dynamic output impedance (note 5) v ka = v ref v ka = v ref ? i ka = 0.1ma ~ 15ma frequency 1khz (fig.1) ? 0.2 0.5 v max v min t i t 2 temperature v dev = v max - v min notes: 4. deviation of reference input voltage, v dev , is defined as the maximum variation of the reference over the full temperature range. the average temperature coefficient of the reference input voltage v ref is defined as: 12 6 ref dev ref tt 10) c)(25v v ( v ? ? = ????????..???..?????.. ( ) c ppm where: t2 ? t1 = full temperature change. v ref can be positive or negative depending on whet her the slope is positive or negative. notes: 5. the dynamic output impedance, r z , is defined as: ka ka ka i v z = when the device is programmed with two external resistors r1 and r2 (see figure 2.), the dynamic output impedance of the overal l circuit, is defined as: ) r2 r1 (1z i v z ka ' ka + = ?
ap431/ap431a adjustable precision shunt regulator ap431/ap431a document number: ds31002 rev. 15 - 2 5 of 16 www.diodes.com june 2010 ? diodes incorporated test circuits input v ref v ka i ka fig 1. test circuit for v ka = v ref in v ref r1 r2 i ref note:v ka =v ref (1+r1/r2)+i refx r1 i ka v ka fig 2. test circuit for v ka > v ref in v ka i z(off) fig 3. test circuit for off-state current
ap431/ap431a adjustable precision shunt regulator ap431/ap431a document number: ds31002 rev. 15 - 2 6 of 16 www.diodes.com june 2010 ? diodes incorporated typical performance characteristics cathode current vs cathode voltage -100 0 100 -1.5 -0.5 0.5 1.5 2.5 cathode voltage (v) cathode current (ma) v ka =v ref ta=25 o c cathode current (ua) vs cathode voltage -1 cathode voltage(v) cathode current (ua) -200 200 400 600 0 -0.5 0 0.5 1 1.5 2 2.5 v ka =v ref ta=25 o c reference voltage vs free-air temperature free-air temperature ( o c) reference voltage (mv) 2480 2485 2490 2495 2500 -40 80 -30 -20 -10 0 10 20 30 40 50 60 70 reference input current vs free temperature free-air temperature ( o c) reference input current (ua) 1 1.2 1.4 1.6 1.8 2 -50 -25 0 25 50 75 100 125 r1=10k i ka =10ma change in reference voltage vs cathode voltage 0 5 10 15 20 25 30 cathode voltage (v) change in reference voltage (mv) -12 -10 -8 -6 -4 -2 0 i ka =10ma ta=25 o c
ap431/ap431a adjustable precision shunt regulator ap431/ap431a document number: ds31002 rev. 15 - 2 7 of 16 www.diodes.com june 2010 ? diodes incorporated typical performance characteristics (continued) + - + - output gnd 15k 8.25k 9 f i ka 232 test circuit for voltage amplification small-signal voltage amplification vs frequency 0 10 20 30 40 50 60 1k 10k 100k 1m 10m f-frequency-hz a v -small signal voltage amplification (db) i ka =10ma t a =25 o c + - i ka gnd output 1k 50 test circuit for reference impedance reference impedance vs frequency 0.1 1 10 100 1k 10k 100k 1m 10m f-frequency-hz | zka | reference impedance ( ) i ka =10ma t =25 c a o
ap431/ap431a adjustable precision shunt regulator ap431/ap431a document number: ds31002 rev. 15 - 2 8 of 16 www.diodes.com june 2010 ? diodes incorporated typical performance characteristics (continued) pulse response 0 1 2 3 4 5 6 -101234567 t-time- s input and output voltage-v input output gnd output 220 50 test circuit for pulse response pulse generator f=100khz t a =25 o c + - 150? i ka v batt c l test circuit for curve a + - c l r1=10k? r2 i ka 150? v batt test circuit for curve b, c, and d + the areas under the curves represent conditions that may cause the device to oscillate. for curves b, c, and d, r2 and v+ were adjusted to establish the initial v ka and i ka conditions with c l =0.v batt and c l were then adjusted to determine the ranges of stability. stability boundary conditions ? 0 10 20 30 40 50 60 70 80 90 100 0.001 0.01 0.1 1 10 c l -load capacitance-f i ka -cathode current-ma a v ka =v ref b v ka =5v c v ka =10v d v ka =15v a b c d stable stable ta=25 o c
ap431/ap431a adjustable precision shunt regulator ap431/ap431a document number: ds31002 rev. 15 - 2 9 of 16 www.diodes.com june 2010 ? diodes incorporated application examples v in + low limit v ref (1 + r1b/r2b) +v be high limit v ref (1 + r1a/r2a) r1a r1b r2a r2b v be output on when low limit < < high limit fig.10 over-voltage / under-voltage protection circuit v in r cl i out i out = v ref / r cl fig. 6 current limiter or current source i out v in i out = v ref / r s r s fig. 7 constant-current sink fig. 4 voltage monitor fig. 5 delay timer v out = (1 + r1/r2) x v ref v in r 1 r 2 fig. 8 higher-current shunt regulator v out v in pulse r 1 r 2 l imit (1 + r1/r2) x v ref fig. 9 crow bar v out v in o n off r + v in delay = rc x ln ( v in -v ref ) led on when low limit < v in high limit low limit v ref (1+r1b/r2b) high limit v ref (1+r1a/r2a) r1a r2a v in r1b r2b < v in
ap431/ap431a adjustable precision shunt regulator ap431/ap431a document number: ds31002 rev. 15 - 2 10 of 16 www.diodes.com june 2010 ? diodes incorporated lead-free lead-free lead-free lead-free lead-free ordering information ap431 x xx x - x reference voltage package tolerance blank : +/- 1% a : +/- 0.5% packing blank : sop-8l y : sot89-3l v : to92-3l sa : sot23 w : sc59 r : sc59r q : sot25 lead free l : lead free g : green (note 6) 7/13 : tape & reel a : ammo box (note 7) sr : sot23r device (note 8) package code packaging (note 9) 7?/13 tape and reel ammo box quantity part number suffix quantity part number suffix ap431(a)sag-7 sa sot23 3000/tape & reel -7 na na ap431(a)srg-7 sr sot23r 3000/tape & reel -7 na na ap431(a)ql-7 q sot25 3000/tape & reel -7 na na ap431(a)qg-7 q sot25 3000/tape & reel -7 na na ap431(a)wl-7 w sc59 3000/tape & reel -7 na na ap431(a)wg-7 w sc59 3000/tape & reel -7 na na ap431(a)rl-7 r sc59r 3000/tape & reel -7 na na ap431(a)rg-7 r sc59r 3000/tape & reel -7 na na ap431(a)g-13 sop-8l 2500/tape & reel -13 na na ap431(a)yl-13 y sot89-3l 2500/tape & reel -13 na na ap431(a)yg-13 y sot89-3l 2500/tape & reel -13 na na ap431(a)vl-a v to92-3l na na 2000/box na ap431(a)vg-a v to92-3l na na 2000/box na notes: 6. sop-8l, sot23 and sot23r are available in ?green? products only. 7. ammo box is for to92-3l spread lead. 8. suffix ?a? denotes ap431a device. 9. pad layout as shown on diodes inc. suggested pad lay out document ap02001, which can be found on our website at http://www.diodes.c om/datasheets/ap02001.pdf.
ap431/ap431a adjustable precision shunt regulator ap431/ap431a document number: ds31002 rev. 15 - 2 11 of 16 www.diodes.com june 2010 ? diodes incorporated marking information (1) sc59 and sc59r 1 2 3 xx y w x ( top view ) xx : identification code w : week : a~z : 1~26 week; x : a~z : green y : year 0~9 a~z : 27~52 week; z represents 52 and 53 week a~z : lead free (2) sot23 and sot23r 1 2 3 xx y w x ( top view ) xx : identification code w : week : a~z : 1~26 week; x : a~z : green y : year 0~9 a~z : 27~52 week; z represents 52 and 53 week (3) sot25 1 2 3 5 7 4 xx y w x ( top view ) xx : identification code w : week : a~z : 1~26 week; x : a~z : green y : year 0~9 a~z : 27~52 week; z represents 52 and 53 week a~z : lead free (4) sop-8l ( top view ) ap431x yy ww x x logo part number 5 8 4 1 g : green accuracy blank : 2.495 + 1% a : 2.495 + 0.5% ww : week : 01~52; 52 yy : year : 08, 09,10~ x : internal code represents 52 and 53 week
ap431/ap431a adjustable precision shunt regulator ap431/ap431a document number: ds31002 rev. 15 - 2 12 of 16 www.diodes.com june 2010 ? diodes incorporated marking information (continued) (5) sot89-3l 1 3 2 x x y w xx : identification code ( top view ) x y : year : 0~9 w : week : a~z : 1~26 week; x : internal code a~z : 27~52 week; z represents 52 and 53 week a~z: green a~z : lead free (6) to92-3l ( top view ) ap431 x y ww x x accuracy blank: 2.495 + 1% a: 2.495 + 0.5% g : green ww : week : 01 ~ 52; 52 y : year : 0 ~ 9 x : internal code represents 52 and 53 week l : lead free identification code table device package (note 10) identification code date code ap431sa sot23 d1 ym ap431asa sot23 d2 ym ap431sr sot23r d5 ym ap431asr sot23r d6 ym ap431q sot25 a2 ym ap431aq sot25 a3 ym ap431w sc59 a6 ym ap431aw sc59 a7 ym ap431r sc59 a8 ym ap431ar sc59 a9 ym ap431y sot89-3l a4 ym ap431ay sot89-3l a5 ym notes: 10. for packaging details, go to our website at http://www.diodes.com/datasheets/ap02007.pdf.
ap431/ap431a adjustable precision shunt regulator ap431/ap431a document number: ds31002 rev. 15 - 2 13 of 16 www.diodes.com june 2010 ? diodes incorporated package outline dimensions (all dimensions in mm) (1) package type: sot25 (2) package type: sc59 and sc59r 0 . 35/0 . 50 0.10/0.20 0.013/0.10 0.35/0.55 0.95 2.70/ 3.00 2.90/3.10 1.00/ 1.30 1.50/ 1.70 1.90 top view 0 o /8 o
ap431/ap431a adjustable precision shunt regulator ap431/ap431a document number: ds31002 rev. 15 - 2 14 of 16 www.diodes.com june 2010 ? diodes incorporated package outline dimensions (continued) (3) package types: sot23 and sot23r (4) package type: sop-8l 1.27typ 0.3/0.5 7~9 4.85/4.95 3.85/3.95 5.90/6.10 0.15/0.25 7~9 0.62/0.82 0.10/0.20 gauge plane 0.254 seating plane 0.35max. 45 detail "a" detail "a" 1.30/1.50 1.75max. land pattern recommendation (unit: mm) 6x-1.27 8x-1.55 8x-0.60 5.4 0/8
ap431/ap431a adjustable precision shunt regulator ap431/ap431a document number: ds31002 rev. 15 - 2 15 of 16 www.diodes.com june 2010 ? diodes incorporated package outline dimensions (continued) (5) package type: sot89-3l 0.80/ 1.20 2.35/2.60 typ 2.48 1.40/1.75 typ 1.60 2.90/3.10 typ 3.00 1.40/1.60 typ 1.50 4.40/4.60 typ 4.50 0.41/0.53 typ 0.47 0.36/0.48 typ 0.42 8 0 (2x) 1.7 0.4 0.9 2.7 1.3 1.9 5 0 (2x) land pattern recommendation (unit: mm) 1.5 0.36/0.48 typ 0.42 1.45/1.55 typ 1.50 0.35/0.43 typ 0.39 3.94/4.25 (6) package type: to92-3l for ammo pack
ap431/ap431a adjustable precision shunt regulator ap431/ap431a document number: ds31002 rev. 15 - 2 16 of 16 www.diodes.com june 2010 ? diodes incorporated important notice diodes incorporated makes no warranty of any kind, express or implied, with regards to this document, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose (and their equivalents under the laws of any jurisdiction). diodes incorporated and its subsidiaries rese rve the right to make modifications, enhanc ements, improvements, corrections or ot her changes without further notice to this document and any product described herein. diodes incorporated does not assume any liabi lity arising out of the application or use of this document or an y product described herein; neither does diodes incorporated convey any license under its patent or trademark rights, nor the rights of othe rs. any customer or user of this document or products desc ribed herein in such applications shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on diodes incorp orated website, harmless against all damages. diodes incorporated does not warrant or accept any liability what soever in respect of any prod ucts purchased through unauthoriz ed sales channel. should customers purchase or use diodes in corporated products for any unintended or unauthorized application, customers shall indemnify and hold diodes incorporated and its representatives har mless against all claims, damages, expenses, and attorney fee s arising out of, directly or indirectly, any claim of personal injury or death a ssociated with such unintended or unauthorized a pplication. products described herein may be covered by one or more united states, international or foreign patents pending. product names and markings noted herein may also be covered by one or more united states, international or foreign trademarks. life support diodes incorporated products are specifica lly not authorized for use as critical co mponents in life support devices or systems without the express written approval of the chief executive officer of diodes incorporated. as used herein: a. life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when pr operly used in accordance with instructions for use provided in the labeling can be reasonably expected to re sult in significant injury to the user. b. a critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. customers represent that they have all necessary expertise in t he safety and regulatory ramifications of their life support dev ices or systems, and acknowledge and agree that they are solely responsi ble for all legal, regulatory and safety-related requirements concerning their products and any use of diode s incorporated products in such safety-cri tical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporated and its repr esentatives against any damages ar ising out of the use of diodes incorporated products in such safety-c ritical, life support devices or systems. copyright ? 2010, diodes incorporated www.diodes.com

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