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ace 431s adjustable precision shunt regulator ver 1. 4 1 d escription the ace431s is a low voltage three terminal adjustable shunt regulator with a guaranteed thermal stability over applicable temperature ranges. the output voltage can be set to any value between vref (approximately 2.5 v) to 18v with two extern al resistors. this device has a typical output impedance of 0.08 . active output circuitry provides a very sharp turn on characteristic, making this device excellent replacement for zener diodes in many applications. the ace431s is characterized for operation from - 40 o c to 125 o c , and five package options (sot - 23 - 3, sot - 23 - 5 l , sop - 8, to - 92 and sot - 89 - 3 ) allow the designer the opportunity to select the proper package for their applications. features low voltage operation (2.5v) adjustable output voltage v 0 =v ref to 18v wide operating current ran ge 150a to 80ma low dyn amic output impedance 0. 08 (typ) trimmed bandgap design up to +0.5% esd rating is 6kv (per mil - std - 883d) roh s compliant and 100% lead (pb) - free application linear regulators adjustable supplies switching power supplies bat tery operated computers instrumentation computer disk drives absolute maximum ratings p arameter s ymbol m ax u nit cathode voltage v ka 18 v continuous cathode current i ka 9 0 ma reference current i ref 1 ma operating junction temperature range t j 150 o c storage temperature range t stg - 65 to 150 o c thermal resistance ja sot - 89 - 3 120 o c /w sot - 23 - 3 230 sot - 23 - 5 l 230 sop - 8 150 to - 92 220
ace 431s adjustable precision shunt regulator ver 1. 4 2 packaging type so p - 8 sot - 23 - 3 sot - 23 - 3(a) sot - 89 - 3 3 3 1 8 2 7 3 6 4 5 1 2 1 2 1 2 3 sot - 23 - 5 l to - 92 5 4 3 2 1 1 2 3 description sop - 8 sot - 23 - 3 sot - 23 - 3(a) sot - 89 - 3 so t - 23 - 5 l to - 92 c athode 1 2 1 3 3 3 a node 2.3.6.7 3 3 2 5 2 nc 4.5 1 .2 r ef 8 1 2 1 4 1 ordering information ace 431 s x x x + h bm : sot - 23 - 3 bma : sot - 23 - 3(a) bn : sot - 23 - 5 l am : sot - 89 - 3 ep : to - 92 fm : sop - 8 pb - free reference voltage accuracy : a : 0.5% b : 1% c : 2% halogen - free
ace 431s adjustable precision shunt regulator ver 1. 4 3 block diagram symbol diagram electrical characteristics t a =25 unles s otherwise specified. parameter test circuit symbol conditions min typ max units reference voltage 0.5% 1 v ref v ka =v ref , i ka =10ma 2483 2495 2507 mv 1% 2470 2495 2520 2% 2445 2495 2545 deviation of reference voltage over full temperature ran ge 1 v i(dev) v ka =v ref , i ka =10ma t a = - 40 to 85 - 14 mv ration of change in reference voltage to the change in cathode voltage 2 iv ref /v ka i i ka =3 ma, v ka =10v - v ref 0.2 2.7 mv/v minimum c athode c urrent for regulation 1 i min v ka =v ref 0.15 0.3 m a dynamic impedance 1 z ka v ka =v ref , i ka =1 to 8 0ma, f Q 1.0khz 0.08 0.7
ace 431s adjustable precision shunt regulator ver 1. 4 4 reference current 2 i ref i ka =10ma, r1=10k, r2= 0.3 4 a deviation of reference current over full temperature range 2 i i(dev) i ka =10ma, r1=10k, r2=, t a =0 to 125 - 0.13 a off - state cathode current 3 i off v ka =18v, v ref =0 0.4 1.0 a typical circuit test circuit 1: v ka =v ref test circuit 2: v ka >v ref test circuit 3: off state current
ace 431s adjustable precision shunt regulator ver 1. 4 5 application diagram typical performance characteristics cathode current vs. cathode voltage cathode current vs. cathode voltage cathode voltage (v) cathode voltage (v) ace431s
ace 431s adjustable precision shunt regulator ver 1. 4 6 reference voltage vs. junc tion temperature stability boundry conditions temperature ( ) load capacitance /pf thermal consideration package power rating (t a =25 ) power rating (t a =50 ) power rating (t a =70 ) sot - 23 - 3 ( ja =230 /w) 435mw 326 mw 239 mw sot - 23 - 5 l ( ja =230 /w) 435mw 326 mw 239 mw to - 92 ( ja =220 /w) 455mw 341 mw 250 mw 1. maximum junction temperature is 125 2. ja is measured with packages mounted onboard under still - air condition with 1w power applied. 3. power rating is calculated using p d =(t j - t a )/ ja , where t j denotes junction temperature and t a denotes ambient temperature.
ace 431s adjustable precision shunt regulator ver 1. 4 7 packing information to - 92
ace 431s adjustable precision shunt regulator ver 1. 4 8 packing information sot - 23 - 3
ace 431s adjustable precision shunt regulator ver 1. 4 9 packing information sot - 23 - 5 l
ace 431s adjustable precision shunt regulator ver 1. 4 10 packing information sot - 89 - 3
ace 431s adjustable precision shunt regulator ver 1. 4 11 packing information sop - 8
ace 431s adjustable precision shunt regulator ver 1. 4 12 notes ace does not assume any responsibility for use as critical components in life support devices or systems without the express written approval of the president and general counsel of ace electronics co., ltd. as sued herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant in to the body, or (b) support or sustain life, and shoes failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. a critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. ace technology co., ltd. http://www.ace - ele.com/

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