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ap432/ap432a adjustable precision shunt regulator ap432/ap432a rev. 1 1 of 11 august 2006 www.diodes.com ? diodes incorporated ? precision reference voltage ? ap432 : 1.24v 1% ? ap432a : 1.24v 0.5% ? sink current capability: 200ma ? minimum cathode current for regulation: 150a ? equivalent full-range temp coefficient: 30 ppm/ o c ? fast turn-on response. ? low dynamic output impedance: 0.2 ? ? programmable output voltage to 20v ? low output noise ? packages: sot89-3l, to92-3l, sop-8l, sot23, sot25, sc-59 the ap432/432a are 3-terminal adjustable precision shunt regulators with guaranteed stable temperature over the applicable extended commercial temperature range. the output voltage may be set at any level greater than 1.24\/ (v ref ) up to 20v 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 t hese devices excellent improved replacements for zener diodes in many applications. the precise +/- 1% reference voltage tolerance of the ap432/432a 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 a p 4 3 2 x xxx package packing -7/-13 : taping blank : sop-8l sa : sot23 w:sc59 r:sc59 q:sot25 lead-free blank : standard l : lead-free g : green tolerance: blank : +/- 1% a : +/- 0.5% reference voltage (note1) -u : tube -b : bulk y : sot89-3l v : to92-3l -a : ammo box note: 1. only for sot23 7? tape and reel 13? tape and reel ammo box device (note 2) package code packaging (note 3) quantity part number suffix quantity part number suffix quantity part number suffix ap432(a)sa sa sot23 3000/tape & reel -7 10000/tape & reel -13 na na ap432(a)q q sot25 3000/tape & reel -7 10000/tape & reel -13 na na ap432(a)w w sc59 3000/tape & reel -7 10000/tape & reel -13 na na ap432(a)r r sc59 3000/tape & reel -7 10000/tape & reel -13 na na ap432(a) sop-8l na na 2500/tape & reel -13 na na ap432(a)y y sot89-3l na na 2500/tape & reel -13 na na ap432(a)v v to92-3l na na na na 2000/box -a notes: 2. suffix ?a? denotes ap432a device. 3. pad layout as shown on diodes inc. suggested pad lay out document ap02001, which can be found on our website at http://www .diodes.com/datasheets/ap02001.pdf. features general description ordering information
ap432/ap432a adjustable precision shunt regulator ap432/ap432a rev. 1 2 of 11 august 2006 www.diodes.com ? diodes incorporated typical application circuit + + r2 r1 v out v in v out = (1+r1/r2)v ref precision regulator c in c out ap432 ref (r) v ref + - anode (a) cathode (c) c athode (c ) ref (r) anode (a) block diagram symbol
ap432/ap432a adjustable precision shunt regulator ap432/ap432a rev. 1 3 of 11 august 2006 www.diodes.com ? diodes incorporated pin connections 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 3 cathode sc-59 (package code -w) anode 1 3ref 2 cathode sop -8l sot 23 anode 1 2 cathode 3ref 1 ref 2 anode 3 cathode 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 absolute maximum ratings cathode voltage?????....??...........?..........??????????????...?????????????????.??.20v continuous cathode current ????????????......................????????????????????...-10ma ~ 250ma reference input current range ?????????...?.???....................???????????????????????10ma operating temperature range..?..??.???????????????????????????????..???? -20 o c ~ 85 o c lead temperature??????.?????.?..???????????????????????...??????..??........260 o c storage temperature ????????..............?......???????.......????????????????...........-65 o c ~ 150 o c power dissipation (notes 4, 5) sot23 package???????????????????????????????. 250mw sot25 package .????.....????????.....?....??????...?......?.?....... 250mw sc59 package......................................................................??????....??...... ..?. 400mw sop-8l package ?????..?????.......??????????????...?....?. 600mw sot89-3l package ...................................................................??????....??....... 800mw to92-3l package??????????????????????????????.. 780mw note: 4. tj, max =150 o c. note :5. ratings apply to ambient temperature at 25 o c.
ap432/ap432a adjustable precision shunt regulator ap432/ap432a rev. 1 4 of 11 august 2006 www.diodes.com ? diodes incorporated electrical characteristics ( t a = 25 o c, v + = +5.0v, unless otherwise stated ) parameter test conditions symbol min. typ. max. unit ap432 1.227 1.252 reference voltage v ka = vref, i ka = 10ma (fig.1) ap432a v ref 1.233 1.24 1.246 v deviation of reference input voltage over temperature (note 6) v ka = v ref , i ka = 10ma , ta = full range (fig.1) v ref 3.0 20 mv ratio of the change in reference voltage to the change in cathode voltage i ka = 10ma (fig.2) v ka = 20 ~v ref ka ref v v ? ? -1.4 -2.0 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) 0.15 0.3 ma off-state current v ka = 20v , v ref = 0v (fig.3) i ka(off) 0.1 1.0 a dynamic output impedance (note 7) v ka = v ref frequency ka z 0.2 0.5 ? v max v min t i t 2 temperature v dev = v max - v min note 6. 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 whet her the slope is positive or negative. note 7. 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 an d 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 + ? ? =
ap432/ap432a adjustable precision shunt regulator ap432/ap432a rev. 1 5 of 11 august 2006 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
ap432/ap432a adjustable precision shunt regulator ap432/ap432a rev. 1 6 of 11 august 2006 www.diodes.com ? diodes incorporated typical performance characteristics + - + - 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 O zka O reference impedance ( ? ) i ka =10ma t =25 c a o + - 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
ap432/ap432a adjustable precision shunt regulator ap432/ap432a rev. 1 7 of 11 august 2006 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 r1 r2 fig. 8 higher-current shunt regulator v out v in puse r1 r2 l imit (1 + r1/r2) x v ref fig. 9 crow bar v out v in on 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
ap432/ap432a adjustable precision shunt regulator ap432/ap432a rev. 1 8 of 11 august 2006 www.diodes.com ? diodes incorporated package diagrams ( 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 (4) sop-8l 0.37/0.51 0?8 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 3.85/3.95 typ 3.90 3.80/3.90 typ 3.85 4 5 x 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
ap432/ap432a adjustable precision shunt regulator ap432/ap432a rev. 1 9 of 11 august 2006 www.diodes.com ? diodes incorporated package diagrams (continued) ( all dimensions in mm ) (5) sot89-3l (6) to92-3l
ap432/ap432a adjustable precision shunt regulator ap432/ap432a rev. 1 10 of 11 august 2006 www.diodes.com ? diodes incorporated marking information (1) sot23/sot25/sc59 sot23/sot25/sc59 : (top view) blank : standard l : lead-free g : g reen xx ym x marking code d ate c ode lead-free y year m : month (a~l) (note1) note: 1. only for sot23 (2) sop-8l accuracy ap432 x yyww x blank: 1.24 1% a : 1.24 0.5% logo ( top view ) yy : year ww: nth week date code lead free blank: standard l : lead free package g : green (3) sot89-3l sot89-3l : (top view) blank : standard l : lead-free g : g reen xx ym x marking code d ate c ode lead-free y year m : month (a~l)
ap432/ap432a adjustable precision shunt regulator ap432/ap432a rev. 1 11 of 11 august 2006 www.diodes.com ? diodes incorporated marking information (continued) (4) to92-3l accuracy ap432 x yww x x blank: a : ( top view ) y : year ww: nth week date code internal code 1% 1.24 0.5% 1.24 blank: normal l: lead free package lead free marking code table device package(note 8) marking code date code ap432sa sot23 d3 ym ap432asa sot23 d4 ym ap432q sot25 b7 ym ap432aq sot25 b8 ym ap432w sc59 b3 ym ap432aw sc59 b4 ym ap432r sc59 b5 ym ap432ar sc59 b6 ym ap432y sot89 b1 ym ap432ay sot89 b2 ym notes: 8. for packaging details, go to our w ebsite at http://www.diodes .com/datasheets/ap02007.pdf. important notice diodes incorporated and its subsidiaries reserve the right to make modifications , enhancements, improvements, corrections or o ther changes without further notice to any product herein. di odes incorporated does not assume any liability ar ising out of the application or use of any p roduct described herein ; neither does it convey any license under its patent rights , nor the right s of others. the user of products 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 our website , harmless against all da mages. life support diodes incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the president of diodes incorporated.

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