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ap431/ap431a adjustable precision shunt regulator ap431/ap431a rev. 8 1 of 15 august 2007 www.diodes.com ? diodes incorporated lead-free lead-free lead-free ? 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/ o c ? fast turn-on response ? low dynamic output impedance: 0.2 ? ? programmable output voltage to 36v ? low output noise ? packages: sot23, sot23r, sot25, sot89-3l, sc59 (w package code), sc59 (r package code), sop-8l and to92-3l ? sot23, sot23r, sop-8l and sc59: available in ?green? molding compound (no br, sb) (note 1) ? lead free finish/rohs compliant for lead free and the ap431 and ap431a are 3-terminal adjustable precision shunt regulators with guaranteed 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 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/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. ?green? products (note 2) ordering information ap431 x x xx reference voltage package tolerance blank : +/- 1% a : +/- 0.5% packing blank : sop-8l y : sot89-3l v : to92-3l sa : sot23 w : sc59 r : sc59 q : sot25 lead free l : lead free package g : green (note 1) -u : tube -7/-13 : taping -a : ammo box (note 3) sr : sot23r note: 1. sot23, sot23r and sop-8l are ?green? products only. 2. rohs revision 13.2.2003. glass and high temperature solder exemptions applied, see eu directive annex notes 5 and 7. 7? tape and reel 13? tape and reel ammo box device (note 4) package code packaging (note 5) quantity part number suffix quantity part number suffix quantity part number suffix ap431(a)sa sa sot23 3000/tape & reel -7 na na na na ap431(a)sr sr sot23r 3000/tape & reel -7 na na na na ap431(a)q q sot25 3000/tape & reel -7 na na na na ap431(a)w w sc59 3000/tape & reel -7 na na na na ap431(a)r r sc59 3000/tape & reel -7 na na na na ap431(a) sop-8l na na 2500/tape & reel -13 na na ap431(a)y y sot89-3l na na 2500/tape & reel -13 na na ap431(a)v v to92-3l na na na na 2000/box -a note: 3. ammo box is for to92-3 spread lead. 4. suffix ?a? denotes ap431a device. 5. pad layout as shown on diodes inc. suggested pad layout document ap02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf . features general description
ap431/ap431a adjustable precision shunt regulator ap431/ap431a rev. 8 2 of 15 august 2007 www.diodes.com ? diodes incorporated pin assignment package pin configuration (top view ) sot 25 package 4ref 5 anode pin configuration (top view ) nc 1 cathode 3 nc 2 sc-59 (package code -r) anode 1 2ref 3cathode sc -59 (package code -w) anode 1 3ref 2cathode sop -8l sot 23 anode 1 2cathode 3ref 1 ref 2 anode + + + 3 cathode to92-3l sot89-3l nc 5 4 18 6 7 3 2 anode anode cathode nc anode ref anode sot23r 1 ref 2 anode 3 cathode anode 1 2 cathode 3 ref
ap431/ap431a adjustable precision shunt regulator ap431/ap431a rev. 8 3 of 15 august 2007 www.diodes.com ? diodes incorporated typical application circuit block diagram ref (r) v ref + - anode (a) cathode (c) cathode (c) ref (r) anode (a) symbol + + 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 rev. 8 4 of 15 august 2007 www.diodes.com ? diodes incorporated absolute maxi mum 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 sot23(r) 250 mw sot25 250 mw sc59 400 mw sop-8l 600 mw sot89-3l 800 mw p d power dissipation (notes 6, 7) to92-3l 780 mw note: 6. t j , max =150c. 7. ratings apply to ambient temperature at 25c.
ap431/ap431a adjustable precision shunt regulator ap431/ap431a rev. 8 5 of 15 august 2007 www.diodes.com ? 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 8) v ka = v ref , i ka = 10ma, ta = full range (fig.1) ? 8.0 20 mv v ka = v ref to10v ? -1.4 -2.0 mv/v v ref v ka ratio of the change in reference voltage to the change in cathode voltage i ka = 10ma (fig. 2) 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 9) v ka = v ref v ka = v ref i ka = 0.1ma ~ 15ma frequency ? 0.2 0.5 ? v max v min t i t 2 temperature v dev = v max - v min note: 8. 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: 9. 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 (1 z i v z ka ' ka + =
ap431/ap431a adjustable precision shunt regulator ap431/ap431a rev. 8 6 of 15 august 2007 www.diodes.com ? 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 rev. 8 7 of 15 august 2007 www.diodes.com ? 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 75100125 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 rev. 8 8 of 15 august 2007 www.diodes.com ? 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 rev. 8 9 of 15 august 2007 www.diodes.com ? 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 rev. 8 10 of 15 august 2007 www.diodes.com ? 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 rev. 8 11 of 15 august 2007 www.diodes.com ? diodes incorporated marking information (1) sot23(r)/sot25/sc59 sot 23(r)/ sot25/sc59 : (top view) xx y m x marking code y year m : month (a~l) x : l : lead free g : green (2) sop-8l sop-8l yy : year ww : nth week ap431 x (top view) yy ww part number logo x l : lead free package g : green package 5 8 4 1 accuracy blank : 2.495 + 1% a : 2.495 + 0.5% (3) sot89-3l sot89-3l : (top view) xx ym x marking code y year m :month (a~l) x : l : lead free
ap431/ap431a adjustable precision shunt regulator ap431/ap431a rev. 8 12 of 15 august 2007 www.diodes.com ? diodes incorporated marking information ( continued ) (4) to92-3l to92-3l (top view) ap431 x y ww x x accuracy blank: 2.495 + 1% a: 2.495 + 0.5% x : internal code ww :nth week y : year l : lead free marking code table device package (note 10) marking 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 note: 10. for packaging details, go to our website at http://www.diodes.com/datasheets/ap02007.pdf .
ap431/ap431a adjustable precision shunt regulator ap431/ap431a rev. 8 13 of 15 august 2007 www.diodes.com ? diodes incorporated package information ( all dimensions in mm ) (1) sot25 (2) sc59 0.10/0.20 typ 0.15 0.013/0.10 typ 0.05 0.35/0.55 typ 0.40 typ 0.95 1.50/1.70 typ 1.60 2.70/3.00 typ 2.80 2.90/3.10 typ 3.00 1.00/1.30 typ 1.10 typ 0.55 top view 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 0/8 (3) sot23(r) (4) sop-8l 3.85/3.95 typ 3.90 3.80/3.90 typ 3.85 4 5 0.60/0.70 typ 0.65 0.15/0.25 typ 0.20 0 . 6 0 / 0 . 8 0 t y p 0 . 7 0 1.27 4.85/4.95 typ 4.90 1.40/1.50 typ 1.45 0.30/0.50 typ 0.40 5.90/6.10 typ 6.00 5 4 1 8 0.08/0.25 typ 0.15 r 0 . 1 ( a l l s i d e ) 9 4 3 0.35 0.37/0.51 0o/8o 0.45/0.60 0.013/ 0.10 0.45/0.61 top view 0.085/0.180 1.20/1.40 2.30/2.50 2.80/3.00 0.89/ 1.03 0. 903/ 1. 10 1.80/2.00
ap431/ap431a adjustable precision shunt regulator ap431/ap431a rev. 8 14 of 15 august 2007 www.diodes.com ? diodes incorporated package information ( continued ) ( all dimensions in mm ) (5) sot89-3l (6) to92-3l for ammo pack
ap431/ap431a adjustable precision shunt regulator ap431/ap431a rev. 8 15 of 15 august 2007 www.diodes.com ? diodes incorporated important notice life support diodes incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or ot her changes without further notice to any product herein. diodes incorporated does not assume any liability arising out of the application or use of any pr oduct described herein; neither does it convey any license under its patent rights, nor the rights of others. the user of products in such applications shall a ssume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on our website, harmless against all dam ages. diodes incorporated products are not authorized for use as critical components in life support devices or systems without the e xpressed written approval of the president of diodes incorporated.

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