page no. : 1/7 avantics - AX431 series specification no.: 050308-fe0001 AX431 series adjustable shunt regulator description the AX431 series are three-terminal adjustable regulators with guarante- ed thermal stability over applicable temperature ranges. the output voltage may be set to any value between v ref (approximately 2.495 volts) and 36 volts with two external resistors. these devices have a typical dynamic output impedance of 0.2 ? . active output circuitry provides a very sharp turn-on characteristic, making these devices excellent replacement for zener diodes in many applications. features ? programmable output voltage ? temperature coefficient is 50ppm/ o c typical ? temperature compensated for operation over full temperature range ? low output noise voltage ? fast turn on response ordering information package v ref : 2.495 2% v ref : 2.495 1% v ref : 2.495 0.5% sot-23 AX431an AX431bn AX431cn sot-89 AX431am AX431bm AX431cm to-92 AX431aa AX431ba AX431ca so-8 AX431as AX431bs AX431cs absolute maximum ratings (operating temperature range applies unless otherwise specified) characteristics symbol value unit cathode voltage v ka 36 v cathode current range (continuous) i k -100~+150 ma reference input current range i ref 0.05~+10 ma sot-23 280 sot-89 770 to-92 770 power dissipation p d so-8 770 mw operating temperature range t opr 0~+70 o c storage temperature range t stg -65~+150 o c operating conditions characteristics symbol min. max. unit cathode voltage v ka v ref 36 v cathode current range (continuous) i k 1 100 ma AX431 series pin assignment 3-lead plastic so-8 package code: s pin 1: cathode pin 2/3/6/7: anode pin 4/5: nc pin 8: reference 5 1 2 3 ? 4 6 7 8 3-lead plastic sot-89 package code: m pin 1: reference pin 2: anode pin 3: cathode 3-lead plastic sot-23 package code: n pin 1: reference pin 2: cathode pin 3: anode 1 2 3 3-lead plastic to-92 package code: a pin 1: reference pin 2: anode pin 3: cathode 1 2 3 1 2 3 free datasheet http:///
page no. : 2/7 avantics - AX431 series specification no.: 050308-fe0001 functional block diagram & symbol test circuits electrical characteristics (t a =25 o c unless otherwise specified) characteristics symbol test conditions min typ max unit AX431an/am/aa/as 2.445 2.495 2.545 AX431bn/bm/ba/bs 2.470 2.495 2.520 reference input voltage (fig1) AX431cn/cm/ca/cs v ref v k =v ref , i k =10ma 2.483 2.495 2.507 v deviation of reference input voltage over- temperature (fig1) v ref ( dev ) v k =v ref , i k =10ma t min t a t max -417mv i k =10ma, ? v k =10v to v ref - -1.4 -2.7 mv/v ratio of change in reference input voltage to the change in cathode voltage (fig2) ? v ref / ? v k i k =10ma, ? v k =36v to 10v - -1.0 -2.0 mv/v reference input current (fig2) i ref i k =10ma, r 1 =10k ? , r 2 = -24ua deviation of reference input current over full temperature range (fig2) i ref ( dev ) i k =10ma, r 1 =10k ? , r 2 = , t a =full range -0.41.2ua minimum cathode current for regulation (fig1) i k(min) v k =v ref -0.41.0ma off-state cathode current (fig3) i k(off) v k =36v, v ref =0 - 0.1 1.0 ua dynamic output impedance (fig1) z k v k =v ref , f 1khz i k =1 to 100ma -0.20.5 ? functional block diagram symbol fig 1. v k =v ref fig 2. v k >v ref fig 3. off-state current reference anode cathode in v k i i i ref v ref i k r 1 i i v k in i ref i k r 2 v ref note: v k =v ref (1+r 1 /r 2 )+i ref xr 1 in v k i off + - v anode reference cathode ref free datasheet http:///
page no. : 3/7 avantics - AX431 series specification no.: 050308-fe0001 characteristics curve small signal voltage amplification & frequency -10 0 10 20 30 40 50 60 1000 10000 100000 1000000 10000000 frequency (hz) voltage amplification (db) cathode current & cathode voltage -100 -75 -50 -25 0 25 50 75 100 125 150 -2 -1 0 1 2 3 cathode voltage (v) cathode current (ma) v k =v ref , ta=25 o c test circuit (fig1) change in reference input voltage & cathode voltage -40 -35 -30 -25 -20 -15 -10 -5 0 5 0 1020304050 cathode voltage (v) change in reference input voltage (mv ) i k =10ma, ta=25 o c test circuits (fig2) reference input voltage & temperature 2.40 2.42 2.44 2.46 2.48 2.50 2.52 2.54 2.56 2.58 -40 -20 0 20 40 60 80 100 120 temperature ( o c) reference input voltage (v ) v k =v ref , i k =10ma test circuit (fig1) cathode current & cathode voltage -400 -200 0 200 400 600 800 1000 -2 -1 0 1 2 3 cathode voltage (v) cathode current (ua) v k =v ref , ta=25 o c test circuit (fig1) 8.2k 15k vout ik 10uf + 240 gnd free datasheet http:///
page no. : 4/7 avantics - AX431 series specification no.: 050308-fe0001 typical application fig 4. shunt regulator fig 5. high current shunt regulator fig 6. output control of a three-terminal fixed regulator fig 7. series pass regulator fig 8. current limiter or current source fig 9. constant current sink r2 vout r1 vcc ax7805 in out common r2 r1 vout vcc r2 r1 vout vcc vout=(1+r 1 /r 2 )v ref vout=(1+r 1 /r 2 )v ref vout=(1+r 1 /r 2 )v ref ; v out(min) =v ref +5v r2 r1 vout vcc vout=(1+r 1 /r 2 )v ref ; v out(min) =v ref +v be rcl vcc iout iout=v ref /r cl rs vcc isink isink=v ref /r s free datasheet http:///
page no. : 5/7 avantics - AX431 series specification no.: 050308-fe0001 sot-23 dimension sot-89 dimension 3 2 1 a b c d e f g h i j dim min. max. a 4.40 4.60 b 4.05 4.25 c 1.50 1.70 d 2.40 2.60 e 0.36 0.51 f *1.50 - g *3.00 - h 1.40 1.60 i 0.35 0.41 *: typical, unit: mm marking: date code control code x431 pb free mark pb-free: " . " (note) normal: none a note: green label is used for pb-free packing pin style: 1.reference 2.anode 3.cathode material: ? lead solder plating: sn60/pb40 (normal), sn/3.0ag/0.5cu or pure-tin (pb-free) ? mold compound: epoxy resin family, flammabilit y solid burnin g class: ul94v-0 3-lead sot-89 plastic surface mounted package avantics package code: m h j k d a l g v c b 3 2 1 s dim min. max. a 2.80 3.04 b 1.20 1.60 c 0.89 1.30 d 0.30 0.50 g 1.70 2.30 h 0.013 0.10 j 0.085 0.177 k 0.32 0.67 l 0.85 1.15 s 2.10 2.75 v 0.25 0.65 *: typical, unit: mm marking: pb free mark pb-free: " " (note) normal: none 431 note: pb-free product can distinguish by the green label or the extra description on the right side of the label. pin style: 1.reference 2.cathode 3.anode material: ? lead solder plating: sn60/pb40 (normal), sn/3.0ag/0.5cu or pure-tin (pb-free) ? mold compound: epoxy resin family, flammabilit y solid burnin g class: ul94v-0 3-lead sot-23 plastic surface mounted package avantics package code: n free datasheet http:///
page no. : 6/7 avantics - AX431 series specification no.: 050308-fe0001 to-92 dimension so-8 dimension important notice: ? all rights are reserved. reproduction in whole or in part is prohibited without the prior written approval of avantic. ? avantics reserves the right to make changes to its products without notice. ? avantics semiconductor products are not warranted to be su itable for use in life-support applications, or systems. ? avantics assumes no liability for any consequence of customer product design, infringement of patents, or application assistan ce. head office: ? avantics microelectronics corp: no. 255, cai lun rd. zhangjiang technology industrial park pudong, shanghai, china tel: 86-021-58955599 fax: 86-021-58558038 a b f c d e g part a i h j k o m l n part a 234 5 6 7 8 pin1 index 3 1 a d b c i 1 e 2 3 g h 2 f dim min. max. a 4.33 4.83 b 4.33 4.83 c 12.70 - d 0.36 0.56 e-*1.27 f 3.36 3.76 g 0.36 0.56 h-*2.54 i-*1.27 1 - *5 2 - *2 3 - *2 *: typical, unit: mm marking: pb free mark pb-free: " . " (note) normal: none control code date code aa 431 x note: green label is used for pb-free packing pin style: 1.reference 2.anode 3.cathode material: ? lead solder plating: sn60/pb40 (normal), sn/3.0ag/0.5cu or pure-tin (pb-free) ? mold compound: epoxy resin family, flammability solid burning class: ul94v-0 3-lead to-92 plastic package avantics package code: a dim min. max. a 4.85 5.10 b 3.85 3.95 c 5.80 6.20 d 1.22 1.32 e 0.37 0.47 f 3.74 3.88 g 1.45 1.65 h 4.80 5.10 i 0.05 0.20 j 0.30 0.70 k 0.19 0.25 l 0.37 0.52 m 0.23 0.28 n 0.08 0.13 o 0.00 0.15 *: typical, unit: mm marking: date code control code pin 1 mark as 431 pb free mark pb-free: " . " (note) normal: none x note: green label is used for pb-free packing pin style: 1.cathode 2/3/6/7.anode 4/5.nc 8.reference material: ? lead solder plating: sn60/pb40 (normal), sn/3.0ag/0.5cu or pure-tin (pb-free) ? mold compound: epoxy resin family, flammability solid burning class: ul94v-0 8-lead so-8 plastic surface mounted package avantics package code: s free datasheet http:///
page no. : 7/7 avantics - AX431 series specification no.: 050308-fe0001 soldering methods for avantics?s products 1. storage environment: temperature=10 o c~35 o c humidity=65%15% 2. reflow soldering of surface-mount devices profile feature sn-pb eutectic assembly pb-free assembly average ramp-up rate (t l to t p )<3 o c/sec <3 o c/sec preheat - temperature min (ts min ) - temperature max (ts max ) - time (min to max) (ts) 100 o c 150 o c 60~120 sec 150 o c 200 o c 60~180 sec tsm a x t o t l - ramp-up rate <3 o c/sec <3 o c/sec time maintained above: - temperature (t l ) - time (t l ) 183 o c 60~150 sec 217 o c 60~150 sec peak temperature (t p ) 240 o c +0/-5 o c 260 o c +0/-5 o c time within 5 o c of actual peak temperature (t p ) 10~30 sec 20~40 sec ramp-down rate <6 o c/sec <6 o c/sec time 25 o c to peak temperature <6 minutes <8 minutes 3. flow (wave) soldering (solder dipping) products peak temperature dipping time pb devices. 245 o c 5 o c 5sec 1sec pb-free devices. 260 o c +0/-5 o c 5sec 1sec figure 1: temperature profile t p t l ramp-down ramp-up ts max ts min critical zone t l to t p t s preheat t l t p 25 t 25 o c to peak time temperature free datasheet http:///
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