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adjustable precision shunt regulator ap431/ap431a this datasheet contains new product information. anachip corp. reserves the rights to modify the product specification without notice. no liability is assumed as a result of the use of this product. no rights under any patent accompany the sale of the product. rev.1.2 sep.28, 2005 1/17 ? features ? precision reference voltage ap431 : 2.495v 1% ap431a : 2.495v 0.5% ? sink current ca pability: 200ma ? minimum cathode current for regulation: 300a ? equivalent full-range temp coefficient: 30 ppm/ o c ? fast turn-on response ? low dynamic output impedance: 0.2 ? ? programmable output voltage to 36v ? low output noise. ? packages: to92, sot89, sot23, sot25 and sop-8l ? description the ap431/ap431a are 3-terminal adjustable precision shunt regulators with guaranteed temperature stabilit y 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 voltage 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 ap431/431a make it possible in many applications to avoid the use of a variable resistor, consequently saving cost and eliminating drift and reliability problems a ssociated with it. ? ordering information a p 4 3 1 x x x x x package packing blank : tube or bulk a : taping reference voltage tolerance: blank : +/- 1% a : +/- 0.5% operating temp. range blank : sop-8l y : sot89-3l v : to92-3l w : sot23-3l r : sot23-3l q : sot25 blank : -20 o c~85 o c i : -40 o c~85 o c lead free blank : normal l : lead free package ? typical application circuit + + r2 r1 v out v in v out = (1+r1/r2)v ref precision regulator c in c out ap431
adjustable precision shunt regulator ap431/ap431a anachip corp. www.anachip.com.tw rev.1.2 sep.28, 2005 2/17 ? block diagram ref (r) v ref + - anode (a) cathode (c) ? symbol cathode (c) ref (r) anode (a) ? pin configuration order number pin configuration (top view) ap431y ap431 ay ap431iy ap431iay (sot89) ap431v ap431 av ap431iv ap431iav (to92) order number ap431r ap431ar ap431ir ap431iar (sot23) ap431w ap431aw ap431iw ap431iaw (sot23) 1 ref 2 anode 3 cathode 1 ref 2 anode + + + 3 cathode anode 1 2 cathode 3 ref anode 1 2 ref 3 cathode cathode 1 anode 2 anode 3 nc 4 5 nc 6 anode 7 anode 8 ref ap431 ap431a ap431i ap431ia (sop) pin configuration (top view) ap431 q ap431 aq ap431iq ap431iaq (sot25) nc 1 4 ref nc 2 cathode 3 5 anode
adjustable precision shunt regulator ap431/ap431a anachip corp. www.anachip.com.tw rev.1.2 sep.28, 2005 3/17 ? marking information (1) sot23 / sot25 / sot89 p/n type x x ap431y a 4 ap431ay a 5 ap431iy a a ap431iay a b ap431w a 6 ap431aw a 7 ap431iw a c ap431iaw a d ap431r a 8 ap431ar a 9 ap431ir a e ap431iar a f ap431q a 2 ap431aq a 3 ap431iq a g ap431iaq a h xx ym x sot23/sot25 xx ym x sot89 date code y :year m : month(a~l) xx : p/n type (top view) x: blank : normal l : lead free package (2) sop accuracy ap431x x yyww x blank: a : logo ( top view ) % 1 495 . 2 (3)to92 accuracy ap431x x y ww x x blank: a : ( top view ) y : year ww: nth week date code internal code temp. grade 1% 2.495 0.5% 2.495 blank: -20 o c ~ +85 o c i : -40 o c ~ +85 o c blank: normal l: lead free package lead free
adjustable precision shunt regulator ap431/ap431a anachip corp. www.anachip.com.tw rev.1.2 sep.28, 2005 4/17 ? absolute maximum ratings cathode voltage ????????????......?...... ................ ........???????????...???.36v continuous cathode current ??????????.??..... ................. .........?????.... -10ma ~ 250ma reference input current range ?????..???.............. ??................... ...........????.?. ...... 10ma operating temperature range (ap431) ????..??.??.....??????.. .........???......-20 o c ~ 85 o c (ap431i).??????.?.............?????????...??.. -40 o c ~ 85 o c lead temperature??????????.????.??.????.. ..????????.........?............ 260 o c storage temperature ???????????......?.... ?.............??????.. ??............ -65 o c ~ 150 o c power dissipation (notes 1. 2) sot8 9 package .????......?????????. ............?.. .. 0. 80w to92 package ?.?? ??..?????????....???.....? 0.78w sot23 package .????? ..?????.......???????.?. 0.25w sot25 package??????.??...?????.???????..0.25w sop package??????..????????????..??? 0.6w note 1: tj, max =150 o c note 2: ratings apply to ambient temperature at 25 o c ? electrical characteristics (ta=25 o c , unless otherwise specified.) parameter test conditions symbol min. typ. max. unit ap431 2.470 2.495 2.520 reference voltage v ka = v ref , i ka = 10ma (fig.1) ap431a v ref 2.482 2.507 v deviation of reference input voltage over temperature (note 3) v ka = v ref , i ka = 10ma, ta = full range (fig.1) v ref 8.0 20 mv v ka = 10v ~v ref ? v ref -1.4 -2.0 mv/v ratio of the change in reference voltage to the change in cathode voltage i ka = 10ma (fig.2) v ka = 36v ~10v ? v ka -1 -2 mv/v reference input current r1 = 10k ? ,r2 = i ka = 10ma (fig.2) i ref 1.4 3.5 a deviation of reference input current over temperature r1 = 10k ? ,r2 = i ka = 10ma ta = full range (fig.2) i ref 0.4 1.2 a minimum cathode current for regulation v ka = v ref (fig.1) i ka(min) 0.19 0.5 ma off-state current v ka = 36v, v ref = 0v (fig.3) i ka(off) 0.1 1.0 a dynamic output impedance (note 4) v ka = v ref frequency ? v max v min t i t 2 temperature v dev = v max - v min
adjustable precision shunt regulator ap431/ap431a anachip corp. www.anachip.com.tw rev.1.2 sep.28, 2005 5/17 note 3. 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: 1 2 6 ref dev ref t t 10 ) c) (25 v v ( v ? ? = ????????..??????.. ( ) c ppm where: t2 ? t1 = full temperature change. v ref can be positive or negative depending on whether the slope is positive or negative. note 4. 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 overall circuit, is defined as: ) r2 r1 (1 z i v z ka ' ka + ? ? = ? test circuits input v ref v ka i ka fig1. test circuit for v ka = v ref in v ref r1 r2 i ref note:v ka =v ref (1+r1/r2)+i ref r1 i ka v ka fig2. test circuit for v ka v ref in v ka i z(off) fig3. test circuit for off-state current
adjustable precision shunt regulator ap431/ap431a anachip corp. www.anachip.com.tw rev.1.2 sep.28, 2005 6/17 ? 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 =vref 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 =vref ta=25 o c reference voltage vs free-air temperature free-air tempeture ( 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 volta g e ( v ) change in reference voltage (mv) -12 -10 -8 -6 -4 -2 0 i ka =10ma ta=25 o c
adjustable precision shunt regulator ap431/ap431a anachip corp. www.anachip.com.tw rev.1.2 sep.28, 2005 7/17 ? typical performance charac teristics(continued) + - + - output gnd 15k ? 8.25k ? 9f 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 O zk a O reference impedance i ka =10ma t a =25 o c
adjustable precision shunt regulator ap431/ap431a anachip corp. www.anachip.com.tw rev.1.2 sep.28, 2005 8/17 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
adjustable precision shunt regulator ap431/ap431a anachip corp. www.anachip.com.tw rev.1.2 sep.28, 2005 9/17 ? 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 limint < v in adjustable precision shunt regulator ap431/ap431a anachip corp. www.anachip.com.tw rev.1.2 sep.28, 2005 10/17 ? package diagrams (1) sot89-3l packag e outline dimension l he e d1 e1 e a d b1 bb 8 0 (2x) 1.7 c 0.4 0.9 2.7 1.3 1.9 5 0 (2x) land pattern recommendation (unit: mm) 1.5 dimensions in millimeters dimensions in inches symbol min. nom. max. min. nom. max. a 1.40 1.50 1.60 0.055 0.059 0.063 b 0.36 0.42 0.48 0.014 0.016 0.018 b1 0.41 0.47 0.53 0.016 0.043 0.051 c 0.35 0.39 0.43 0.014 0.015 0.017 d 4.40 4.50 4.60 0.173 0.177 0.181 d1 1.40 1.60 1.75 0.055 0.062 0.069 e 2.90 3.00 3.10 0.114 0.118 0.122 e1 1.45 1.50 1.55 0.057 0.059 0.061 e 2.35 2.48 2.60 0.093 0.098 0.102 he 3.94 - 4.25 0.155 - 0.167 l 0.80 - 1.20 0.031 - 0.047
adjustable precision shunt regulator ap431/ap431a anachip corp. www.anachip.com.tw rev.1.2 sep.28, 2005 11/17 (2) to92-3l package outline dimension d b b 1 b e l e a 1 a dimensions in millimeters dimensions in inches symbol min. nom. max. min. nom. max. a 3.302 3.556 3.810 0.130 0.140 0.150 a1 1.016 - - 0.040 - - b 0.330 0.381 0.432 0.013 0.015 0.017 b1 0.406 0.457 0.506 0.016 0.018 0.020 d 4.445 4.572 4.699 0.175 0.180 0.185 e 4.445 4.572 4.699 0.175 0.180 0.185 l 13.00 - 15.50 0.512 - 0.610 e 1.150 1.270 1.390 0.045 0.050 0.055
adjustable precision shunt regulator ap431/ap431a anachip corp. www.anachip.com.tw rev.1.2 sep.28, 2005 12/17 (3) sot23-5l package outline dimension l e e he d a2 a1 b(5x) a view c l1 1(4x) 2(4x) e1 gauge plane c see view c dimensions in millimeters dimensions in inches symbol min. nom. max. min. nom. max. a 1.05 - 1.35 0.041 - 0.053 a1 0.05 - 0.15 0.002 - 0.006 a2 1.00 1.10 1.20 0.039 0.043 0.047 b 0.25 - 0.50 0.010 - 0.020 c 0.08 - 0.20 0.003 - 0.008 d 2.70 2.90 3.00 0.106 0.114 0.118 e 1.50 1.60 1.70 0.059 0.063 0.067 he 2.60 2.80 3.00 0.102 0.110 0.118 l 0.30 - 0.60 0.012 - 0.024 l1 0.50 0.60 0.70 0.020 0.024 0.028 e 1.80 1.90 2.00 0.071 0.075 0.079 e1 0.85 0.95 1.05 0.033 0.037 0.041 0 o 5 o 10 o 0 o 5 o 10 o 1 3 o 5 o 7 o 3 o 5 o 7 o 2 6 o 8 o 10 o 6 o 8 o 10 o
adjustable precision shunt regulator ap431/ap431a anachip corp. www.anachip.com.tw rev.1.2 sep.28, 2005 13/17 (4) sot23-3l package outline dimension l e e he d a2 a1 b(3x) a view c l1 1(4x) 2(4x) e1 gauge plane c see view c dimensions in millimeters dimensions in inches symbol min. nom. max. min. nom. max. a 1.05 - 1.35 0.041 - 0.053 a1 0.05 - 0.15 0.002 - 0.006 a2 1.00 1.10 1.20 0.039 0.043 0.047 b 0.25 - 0.50 0.010 - 0.020 c 0.08 - 0.20 0.003 - 0.008 d 2.70 2.90 3.00 0.106 0.114 0.118 e 1.50 1.60 1.70 0.059 0.063 0.067 he 2.60 2.80 3.00 0.102 0.110 0.118 l 0.30 - 0.60 0.012 - 0.024 l1 0.50 0.60 0.70 0.020 0.024 0.028 e 1.80 1.90 2.00 0.071 0.075 0.079 e1 0.85 0.95 1.05 0.033 0.037 0.041 0 o 5 o 10 o 0 o 5 o 10 o 1 3 o 5 o 7 o 3 o 5 o 7 o 2 6 o 8 o 10 o 6 o 8 o 10 o
adjustable precision shunt regulator ap431/ap431a anachip corp. www.anachip.com.tw rev.1.2 sep.28, 2005 14/17 (5) sop-8l package outline dimension view "a" l c view "a" h e a a2 a1 b e d 7 (4x) 0.015x45 7 (4x) y dimensions in millimeters dimensions in inches symbol min. nom. max. min. nom. max. a 1.40 1.60 1.75 0.055 0.063 0.069 a1 0.10 - 0.25 0.040 - 0.100 a2 1.30 1.45 1.50 0.051 0.057 0.059 b 0.33 0.41 0.51 0.013 0.016 0.020 c 0.19 0.20 0.25 0.0075 0.008 0.010 d 4.80 5.05 5.30 0.189 0.199 0.209 e 3.70 3.90 4.10 0.146 0.154 0.161 e - 1.27 - - 0.050 - h 5.79 5.99 6.20 0.228 0.236 0.244 l 0.38 0.71 1.27 0.015 0.028 0.050 y - - 0.10 - - 0.004 0 o - 8 o 0 o - 8 o
adjustable precision shunt regulator ap431/ap431a anachip corp. www.anachip.com.tw rev.1.2 sep.28, 2005 15/17 ? taping information (1)to92 taping po m ho t f2 f1 do a ? h millimeters inches symbol min. typ. max. min. typ. max. po 12.4 12.7 13.0 0.488 0.500 0.512 m 2.0 2.5 3.0 0.079 0.098 0.118 ho 15.5 16.0 16.5 0.610 0.630 0.650 do - 4.0 - - 0.157 - a - 6.0 - - 0.236 - h 0.0 - 1.0 0.000 - 0.039 t - 18.0 - - 0.709 - f1 2.4 2.5 2.9 0.094 0.098 0.114 f2 2.4 2.5 2.9 0.094 0.098 0.114 30 1mm 90 1mm 76 1mm 360 2mm 45mm 53 2mm e 330mm 40mm 205mm
adjustable precision shunt regulator ap431/ap431a anachip corp. www.anachip.com.tw rev.1.2 sep.28, 2005 16/17 (2)to92 taping h2a h2a d1 f1 f2 p1 p p2 d l l1 a d2 h1 h4 h3 h w1 w h2 h2 t2 t t1 millimeters inches symbol min. typ. max. min. typ. max. a 3.18 7.59 12 0.125 0.299 0.472 d 3.8 4 4.2 0.150 0.157 0.165 d1 0.36 0.445 0.53 0.014 0.018 0.021 d2 - - 9.0 - - 0.354 f1,f2 2.4 2.5 2.7 0.094 0.098 0.106 f1-f2 - 0.30 - - 0.012 - h 15.5 16 16.5 0.610 0.630 0.650 h1 8.5 9 9.5 0.335 0.354 0.374 h2 - - 0.5 - - 0.020 h2a - - 0.5 - - 0.020 h3 - - 27 - - 1.063 h4 - - 20 - - 0.787 l - - 11 - - 0.433 l1 2.5 - - 0.098 - - p 12.5 12.7 12.9 0.492 0.500 0.508 p1 5.95 6.35 6.75 0.234 0.250 0.266 p2 50.3 50.8 51.3 1.980 2.000 2.020 t - - 0.55 - - 0.022 t1 - - 1.42 - - 0.056 t2 0.36 0.52 0.68 0.014 0.020 0.027 w 17.5 18.25 19 0.689 0.719 0.748 w1 5 6 7 0.197 0.236 0.276 ----* 253 254 255 9.961 10.000 10.039 ----* = every 20 pcs distance.
adjustable precision shunt regulator ap431/ap431a anachip corp. www.anachip.com.tw rev.1.2 sep.28, 2005 17/17 ? box dimension 53 195 40 40 70 195 40 197 40.5 40.5 41 330 24 556 811.5 330 37.5 6 43 4.68 18.18 16.67 18.68 38.5 39.5 unit:mm.

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