1 r ev.1. 1 4 - elm 0431ba 2.5v programable shunt regulator elm 0 431ba is three-terminal adjustable shunt regulator utilizing an accurate 2.5v band-gap reference. the output voltage can be set to any value between 2.5v (vref) to 29v with two external resistors as shown in the typical application circuit. the device exhibit a wide operating current range of 0.4 to 100 ma with a typical dynamic impedance of 0.25. the characteristics of these reference make it excellent replacements for zener diodes in many applications such as digital voltmeters, power supplies, and op amp circuitry. the 2.5v volt reference makes it convenient to obtain a stable reference from 5.0v logic supplies. elm0431ba shunt regulator is available in a sot-23 package. ? linear regulator ? precision voltage reference ? switching power supplies ? battery operating equipment ? instrumentation elm 0431ba - s symbol a package b : sot - 23 b product version a c taping d irection s: refer to pkg file pin no. pin name 1 reference 2 cathode 3 anode sot - 23 (top view) 1 2 3 elm0431 b a - s a b c g e neral description f eatures applica tion maximum a bsolute ratings selection guide pin configuration parameter symbol limit unit cathode-anode reverse breakdown voltage v ka 30 v cathode Canode current ika 100 ma reference input current iref 10 ma power dissipation pd 200 mw j unction temperature t j 1 50 c storage temperature t stg - 65 to + 150 c ? low cost solution ? shunt capacity : 100ma ? output voltage range ( adj. ) : s et up to 29v ? o utput impedance : typ. 0.25 ? trimmed band-gap design : 1% ? package : sot - 23 circuit c a t h o d ( k ) a n o d e ( a ) r e f e r e n c e ( r ) * taping d irection is one way.
2 r ev.1. 1 4 - typical application s hunt regulator r 1 0 . 1 % r 2 0 . 1 % v o u t v i n ( b a t t ) r e t u r n e l m 0 4 3 1 b a r v r e f b lock diagram ? ? reference (r) cathod (k) anode (a) 2.5 vref marking a b c d e s o t -2 3 a to e : assembly lot no. a to z (i, o, x ex cepted) and 0 to 9 elm 0431ba 2.5v p rogramable s hunt regulator vout = ( 1 + r 1 /r2) vref
3 r ev.1. 1 4 - i k v r e f r 1 r 2 v k a v i n i r e f test circuit 1 : vka=vref i k i r e f v k a v i n test circuit 2 : vka>vref electrical characteristics vka=vref, ik=10ma, top = 25 c, unless otherwise stated parameter symbol condition min. typ. max. unit note reference voltage vref 2.470 2.495 2.520 v 1 reference voltage with temperature v ref/ top 0.07 0.20 mv/c 1 ration of change in vref to cathode voltage v ref / v in vref to 10v -2.7 -1.0 mv/v 2 10v to 30v -2.0 -0.4 0.3 reference input current iref 0.7 4.0 a 2 iref temp erature deviation iref ta=-20 to 85 c 0.4 1.2 a 2 min. ik for regulation ik(min) 0.4 1.0 ma 1 s tand-by current istandby vref=0v, vka=30v 0.04 250 na 3 dynamic output impedance zout f 1khz, ik=1 to 100ma 0.25 0.50 1 note : test circuit no. t est circuits test circuit 3 : off state current v k a i k ( o f f ) v i n elm 0431ba 2.5v p rogramable s hunt regulator
4 r ev.1. 1 4 - typical characteristics elm 0431ba 2.5v p rogramable s hunt regulator vs. cathode voltage cathode current cathode current vs. cathode voltage vs. junction temperature r z ( ? ) reference impedance vs. junction temperature ratio of delta reference voltage to delta cathode voltage v r e f / v z ( - m v / v ) vz = 3v to 30v vs. junction temperature off-state cathode current vs. junction temperature reference voltage
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