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rev f: nov 2-06 spx43 a,b,c precision adjustable shunt regulator ? 2006 sipex corporation precision adjustable shunt regulator the spx43 is a three-terminal adjustable shunt voltage regulator providing a highly accurate bandgap reference. the spx431 acts as an open-loop error amplifer with a 2.5v temperature compensation reference. the spx431 has thermal stability, wide operating current of 150ma and broad temperature range of 0 c to 150c, making it suitable for a variety of applications which require a low-cost, high performance solution . spx431a tolerance of 0.5% is proven to be suffcient to overcome all other errors in the system to virtually eliminate the need for trimming in the power supply manufacturer's assembly line and contribute a signifcant cost savings. the output voltage may be adjusted to any value between v ref and 36 volts with two external resistors. the spx431 is available in soic-8, sot-23-3, sot-23-5, sot89, and to-92 packages. spx431a,b,c features ? trimmed bandgap: 0.5%, 1% and 2% ? wide operating current: 1ma to 150ma ? extended temperature range: 0c to 105c ? low temperature coeffcient: 30 ppm/c ? improved replacement in performance for tl43 ? low cost solution ? available in lead free, rohs compliant packaging: soic, sot-89, sot-23-3, sot-23-5, and to-92 applications ? battery operated equipment ? adjustable supplies ? switching power supplies ? error amplifers ? single supply amplifer ? monitors/vcrs/tvs ? personal computers description anode (a) cathode (k) 2.5v reference (r) + - typical applications circuit
2 rev f: nov 2-06 spx43 a,b,c precision adjustable shunt regulator ? 2006 sipex corporation typical thermal resistances package ? ja ? jc ty pical derating sot-89 107.1c/w 8c/w 9.1 mw/c soic-8 124.8c/w 45c/w 5.7 mw/c sot-23-5 191c/w 150c/w 1.7 mw/c to-92 131.9c/w 80c/w 6.3 mw/c sot-23-3 300c/w 136c/w 3.3 mw/c absolute maximum ratings cathode-anode reverse breakdown v ka ...................................... 37v anode-cathode forward current, (<10ms) i ak ................................ a operating cathode current i ka .................................................. 150ma reference input current i ref ...................................................... 0ma continuous power dissipation at 25c p d soic-8 ..................................................................... 750mw sot-23-5 ................................................................ 200 mw sot-23-3 ................................................................ 47 mw sot-89 .................................................................. 000mw\ to-92 ....................................................................... 775mw junction temperature t j ........................................................... 150 c storage temperature t stg ............................................... -65 to 150 c note: stresses greater than those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this speci - fcation is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability. recommended conditions typical deratings of the thermal resistances are given for ambient temperature >25. cathode voltage v ka v ref to 36 v cathode current i k 0 ma para meter symbol rating unit electrical c haracteristics electrical characteristics at 25c i k = 10ma v k = v ref , unless otherwise specifed. parameter symbol test conditions test circuit spx431a spx431b spx431c unit min typ max min typ max min typ max reference voltage v ref t j = 0c to 105c 2.490 2.469 2.503 2.515 2.536 2.470 2.449 2.495 2.520 2.541 2.445 2.495 2.545 v v ?v ref with temp. tc 0.07 0.20 0.07 0.20 0.07 0.20 mv/ c ratio of change in v ref to cath - ode voltage ?v ref ?v k v ref to 10v 10v to 36v 2 -2.7 -2 -.0 -0.4 0.3 -2.7 -2.0 -.0 -0.4 0.3 -2.7 -2 -.0 -0.4 0.3 mv/ v reference input current i ref 2 0.7 4 0.7 4 0.7 4 a i ref temp deviation ?i ref t j = 0c to 105c 2 0.4 .2 0.4 .2 0.4 .2 a min i k for regulation i k(min) 0.4 0.4 0.4 ma off state leak - age i k(off) v ref = 0v, v ka = 36v 3 0.04 250 0.04 500 0.04 000 na dynamic output impedance z ka f z = 1khz i k = 1 to 150ma 0.15 0.5 0.15 0.5 0.15 0.5 ?
3 rev f: nov 2-06 spx43 a,b,c precision adjustable shunt regulator ? 2006 sipex corporation d d v r e f 0 1 5 3 0 4 5 6 0 7 5 9 0 1 0 5 - 1 0 0 . 5 5 0 0 0 0 0 0 0 . 0 7 m v / c 0 . 0 0 3 % / c 2 7 p p m / c t c i n m v / c = t c i n % / c = d v r e f ( m v ) d t a d t a d v r e f a t 2 5 c d v r e f x 1 0 0 ( ) t c i n p p m / c = d t a d v r e f a t 2 5 c d v r e f x 1 0 6 ( ) ppm/c %/c mv/c junction temperature (c) c alculating a verage tem perature coefficient (tc) figure 1. v vs temperature. sot-23-5 (m5) 3 2 1 top view spx431 5 4 top view spx431 sot-89 (m1) 1 2 3 bottom view to-92 (n) 1 3 2 n/c ref anode cathode cathode anode ref top view 2 1 3 4 8 7 6 5 spx431 8-pin surface mount (s) cathode ref anode anode anode anode n/c n/c n/c cathode anode ref top view spx431 sot-23-3 (m) 1 2 3 ref anode cathode package pinouts test circuits i ref v ka = v ref v in i k i ref v ka v in i k (v ref ) r1 r2 v ka v in i k (off) test circuit . test circuit for v = v test circuit 2. test circuit for v > v test circuit 3. test circuit for i
4 rev f: nov 2-06 spx43 a,b,c precision adjustable shunt regulator ? 2006 sipex corporation - 2 - 1 0 1 2 3 - 1 0 0 - 7 5 - 5 0 - 2 5 0 2 5 5 0 7 5 1 0 0 1 2 5 1 5 0 i k - cathode current (ma) v ka - cathode voltage (v) v ka = v ref temperature range: 0c to 105c -60 -30 0 30 60 90 120 2.53 2.52 2.51 2.50 2.49 2.48 2.47 2.46 2.45 t a ambient temperature (c) v ref reference voltage (v) v ka = v ref i k = 10ma tica erfrace caracteritic high current operating characteristics reference voltage vs. ambient temperature -1.0 0 1.0 2.0 3.0 900 800 700 600 500 400 300 200 100 0 -100 -200 v ka cathode voltage (v) i k cathode current ( a) v ka = v ref 0 to 105c 105c 25c -0c -60 -30 0 30 60 90 120 3.0 2.5 2.0 1.5 1.0 0.5 0 t a ambient temperature (c) i ref reference input current (a ) r1 = 10k? r2 = i k = 10ma 0 3 6 9 12 15 18 21 24 27 30 0 -10 -20 -30 -40 -50 v ka cathode voltage (v) ?v ref (mv) 0c 25c 75c 125c i ka = 10ma reference voltage line regulation vs, cathode volt - age and t ambient low current operating characteristics reference input current vs. ambient temperature 70 60 50 40 30 20 10 0 f frequency (hz) noise voltage nv/ hz v ka = v ref i k = 10ma t a = 25c noise voltage vs. frequency
5 rev f: nov 2-06 spx43 a,b,c precision adjustable shunt regulator ? 2006 sipex corporation typical performance characteristics ( continued) -60 -30 0 30 60 90 120 0.150 0.125 0.100 0.075 0.050 0.025 0.0 t a free air temperature v ka = v ref i k = 1 to 100ma f1khz low frequency dynamic output impedance vs. t ambient 10 100 1k 10k 100k 1m 10m st ar t 10.000hz st op 50 000 000.000hz ref level 60.000db 0.0deg /div 10.000db 45.000deg marker 19 422 ma g (a/r) marker 19 422 phase (a/r) 611.000hz -0.125db 611.000hz 46.717deg phase gain 60db 50db 40db 30db 20db 10db 0db -10db -20db -30db -40db 215 180 135 90 45 0 -45 -90 -135 -180 -215 small signal gain and phase vs. frequency; i k = 0ma, t a = 25c i k v in 9f 15k? 8.25k? v out gnd 230? test circuit for gain and phase frequency re - sponse f z = 100khz, i k = 0ma, t a = 25c v out v in test circuit for pulse response stability boundry conditions i k v out gnd 250? 50? v in f p = 100khz 10 0 10 1 10 2 10 3 10 4 10 5 10 6 10 7 100 90 80 70 60 50 40 30 20 10 0 c l load capacitance (pf) i k cathode current (ma) a: v ka = v ref b: v ka = 5v at i k =10ma c: v ka =10v at i k =10ma d: v ka =15v at i k =10ma c d b a stable stable t a = 25c
6 rev f: nov 2-06 spx43 a,b,c precision adjustable shunt regulator ? 2006 sipex corporation typical performance characteristics ( continued) test circuit for stability dynamic output impedance t a = 25c, i k = to 00ma off-state leakage shunt regulator v out = (1+r1/r2)v ref 1 5 0 w 10k? i k c l r 0.01 0.1 1 10 100 -50 0 50 100 150 t a ambient temperature (c) i koff cathode current (na) v ka = 36v v ref = 0v t a = 2 5 c i k = 1 to 100ma z ka - dynamic impedance (?) f frequency (hz) 100 10 1.0 0.1 0.01 1k 10k 100k 1m 10m r2 0.1% v in r3 r1 0.1% v out v ref spx431a,b,c constant current, sink, i sink = v ref /r1 reference amplifer for isolated feedback in off-line dc-dc converters q1 v in r2 r1 0.1% i sink spx431a,b,c r2 0.1% r3 r1 0.1% v out spx431a,b,c c2 c1 isolated feedback v out rtn + r3 sets feedback gain, c1 provides feedback compensation opto isolator
7 rev f: nov 2-06 spx43 a,b,c precision adjustable shunt regulator ? 2006 sipex corporation typical performance characteristics ( continued) figure 23. precision high current series regulator v out = (1+r1/r2)v ref figure 24. high current shunt regulator v out = (1+r1/r2)v ref figure 25. single supply comparator with tempera - ture compensated threshold. v in threshold = 2.5v v in r1 0.1% spx431a,b,c r3 r2 0.1% c1 r5 r4 v out v in r1 0.1% spx431a,b,c r3 r2 0.1% q1 v out v cc r2 spx431a,b,c v in v out r1 * resistor values are chosen such that the ef - fect to i ref is negligible.
8 rev f: nov 2-06 spx43 a,b,c precision adjustable shunt regulator ? 2006 sipex corporation package: 8 pin nsoic
9 rev f: nov 2-06 spx43 a,b,c precision adjustable shunt regulator ? 2006 sipex corporation package: 5 pin sot-23
0 rev f: nov 2-06 spx43 a,b,c precision adjustable shunt regulator ? 2006 sipex corporation package: 3 pin sot-89
rev f: nov 2-06 spx43 a,b,c precision adjustable shunt regulator ? 2006 sipex corporation package: 3 pin to-92
2 rev f: nov 2-06 spx43 a,b,c precision adjustable shunt regulator ? 2006 sipex corporation package: 3 pin sot-23
3 rev f: nov 2-06 spx43 a,b,c precision adjustable shunt regulator ? 2006 sipex corporation sipex corporation headquarters and sales offce 233 south hillview drive milpitas, ca 95035 tel: (408) 934-7500 fax: (408) 935-7600 ordering inform ation part nu mber accurac y output v oltage package spx431am5 ......................... 0.5% ..................... 2.503v .......................... 5-pin sot-23 spx431am5/tr .................... 0.5% ..................... 2.503v .......................... 5-pin sot-23 spx43am ......................... 0.5% ..................... 2.503v .......................... 3-pin sot-89 spx431am1/tr .................... 0.5% ..................... 2.503v .......................... 3-pin sot-89 spx43as ............................ 0.5% ..................... 2.503v ............................. 8-pin soic spx431as/tr ...................... 0.5% ..................... 2.503v ............................. 8-pin soic spx43an ............................ 0.5% ..................... 2.503v ............................ 3-pin to-92 spx43am ........................... 0.5% ..................... 2.503v .......................... 3-pin sot-23 spx431am/tr ...................... 0.5% ..................... 2.503v .......................... 3-pin sot-23 spx431bm5 ......................... 1.0% ..................... 2.495v .......................... 5-pin sot-23 spx431bm5/tr .................... 1.0% ..................... 2.495v .......................... 5-pin sot-23 spx43bm ......................... 1.0% ..................... 2.495v .......................... 3-pin sot-89 spx431bm1/tr .................... 1.0% ..................... 2.495v .......................... 3-pin sot-89 spx43bs ............................ 1.0% ..................... 2.495v ............................. 8-pin soic spx431bs/tr ...................... 1.0% ..................... 2.495v ............................. 8-pin soic spx43bn ............................ 1.0% ..................... 2.495v ............................ 3-pin to-92 spx43bm ........................... 1.0% ..................... 2.495v .......................... 3-pin sot-23 spx431bm/tr ...................... 1.0% ..................... 2.495v .......................... 3-pin sot-23 spx431cm5 ......................... 2.0% ..................... 2.495v .......................... 5-pin sot-23 spx431cm5/tr ................... 2.0% ..................... 2.495v .......................... 5-pin sot-23 spx43cm ......................... 2.0% ..................... 2.495v .......................... 3-pin sot-89 spx431cm1/tr ................... 2.0% ..................... 2.495v .......................... 3-pin sot-89 spx43cs ............................ 2.0% ..................... 2.495v ............................. 8-pin soic spx431cs/tr ...................... 2.0% ..................... 2.495v ............................. 8-pin soic spx43cn ............................ 2.0% ..................... 2.495v ............................ 3-pin to-92 spx43cm ........................... 2.0% ..................... 2.495v .......................... 3-pin sot-23 spx431cm/tr ..................... 2.0% ..................... 2.495v .......................... 3-pin sot-23 /tr = tape and reel tr pack quantity is 3000 for sot-23-3, 2500 for sot-23-5, sot-89 and nsoic, and 2000 for to-92 in ammo pack. available in lead free packaging. to order add -l suffx to part number. example: spx431am5/tr = standard; spx431am5-l/tr = lead free sipex corporation reserves the right to make changes to any products described herein. sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.

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