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1 date: 12/11 /04 spx432 1.24v precision adjustable shunt regulator ? co pyright 2004 sipex corporation 1.24v precision adjustable shunt regulator spx432 description features low voltage operation, 1.24v trimmed bandgap to 0.5% and 1% wide operating current, 1ma to 80ma adjustable output voltage, v ref to 18v extended temp.range: 0 c to 105 c low temperature coefficient, 50 ppm/ c offered in to-92, soic, sot-23-3 replacement for tlv431, as432 ? the spx432 is a 3-terminal adjustable shunt voltage regulator providing a highly accurate 1.24v bandgap reference with 0.5% tolerance. the spx432? thermal stability, wide operating current (80ma) and temperature range (0 c to 105 c) makes it suitable for a variety of applications. spx432 tolerance of 0.5% is proven to be sufficient to overcome all of the other errors in the system to virtually eliminate the need for trimming in the power supply manufactures?assembly lines and contribute a significant cost savings. the spx432 is an ideal voltage reference in an isolated feedback circuit for switch mode power supplies. spx432 offers many advantages over the tlv431 such as wider output voltage (18v vs. 6v), higher output current (80ma vs. 15ma) and a wider operating temperature range with a tighter tolerance down to 0.5%. single supply amplifier monitors / vcrs / tvs personal computers voltage references block diagram cat hode (k) 1.24v refer ence (r) + - anode (a) now available in lead free packaging applications switching power supplies adjustable supplies error amplifiers refer to page 11 for other pinouts. spx432 3 pin sot-23 ref anode cathode 1 2 3
2 date: 12/11 /04 spx432 1.24v precision adjustable shunt regulator ? co pyright 2004 sipex corporation absolute maximum ratings cathode-anode reverse breakdown v ka ....................................... 20v anode-cathode forward current, (<10ms) i ak ................................. 1a operating cathode current i ka .................................................... 80ma reference input current i ref .......................................................... 1ma continuous power dissipation at 25 c p d to-92 ..................................................................... 775mw sot-23 .................................................................. 200 mw soic-8 .................................................................... 750mw junction temperature t j ........................................................... 150 c storage temperature t stg .......................................... -65 c to 150 c lead temperature (soldering 10 sec.) t l .................................. 300 c stresses greater than those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress ra ting only and functional operation of the device at these or any other conditions above those indicated in the operational sections of th is specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability. electrical characteristics are guaranted over the full junction temperature range (0 c to 105 c). ambient temperature must be derated based upon power dissipation and package thermal characteristics. unless otherwise specified, test conditions are: v ka = v ref and i k = 10ma. parameter symbol test conditions min typ max min typ max units circuit spx432a spx432 output voltage v ref 3a 1.2338 1.240 1.2462 1.2276 1.240 1.2524 v temperature deviation v ref 3a 0 < t j < 105 c12201 220mv line regulation v ref 3b v ka = 1.25v to 15v 19 37 19 37 mv load regulation v ref 3a i k = 1ma to 80ma 12 30 12 30 mv reference input current i ref 3b 3 6 36 a reference input current i ref 3b 0 < t j < 105 c, 0.3 0.6 0.3 0.6 a temperature coefficient minimim cathode i k(min) 3a 0.6 1 0.6 1 ma current for regulation off state leakage i k(min) 3c v ref = 0v, 0.04 500 0.04 500 na v ka = 18v recommended conditions parameter symbol rating unit cathode voltage v ka v ref to 18 v cathode current i k 10 ma typical thermal resistances package 0 ja 0 jc typical derating to-92 160 c/w 80 c/w 6.3mw/ c sot-23 575 c/w 150 c/w 1.7 mw/ c soic-8 175 c/w 45 c/w 5.7mw/ c typical deratings of the thermal resistances are given for ambient temperature >25 c. electrical characteristics
3 date: 12/11 /04 spx432 1.24v precision adjustable shunt regulator ? co pyright 2004 sipex corporation 0 5000 ppm 0 0.5 % 27ppm/ c 0.0027% / c 0.0033mv / c 015 3045 60 7590105 0 mv -5 ? t ? v ref junction temperature ( c) ? v ref (mv) ? t a ( ? v ref at 25 c ) ? t a ? v ref x 100 ? tc in % / c = ? tc in mv / c = ( ? v ref at 25 c ) ? t a ? v ref x 10 6 ? tc in ppm / c = calculation average temperature coeficient (tc) figure 1. v ref vs temperature. 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) figure 2. test circuit for v ka = v ref figure 3. test circuit for v ka > v ref figure 4. test circuit for i koff
4 date: 12/11 /04 spx432 1.24v precision adjustable shunt regulator ? co pyright 2004 sipex corporation -2 -1 0 1 2 3 15.0 12.5 10.0 7.5 5.0 2.5 0 -2.5 -5.0 -7.5 -10.0 v ka cathode voltage (v) i k cathode current (ma) v ka = v ref 0 c to 105 c typical performance characteristics 900 800 700 600 500 400 300 200 100 0 -100 -200 -1.0 0 = 105 c 25 c -0 c v ka - cathode voltage (v) i k - cathode current (a) -0.5 0.25 0.5 0.75 1.0 1.25 1.5 1.24 v ka = v ref te mperature range: 0 c to 105 c high current operating characteristics. v ka = v ref, i ka = 10ma. low current operating characteristics. v ka = v ref, sweeping i ka , 25 c. reference input current vs temperature; i ka = 10ma. reference voltage line regulation; i ka = 10ma , sweeping v ka , 25 c. 0 0.5 1 1.5 2 2.5 3 -60 -30 0 30 60 90 t a -ambient temperature (c) i ref -reference input current (ua) 1.235 1.24 1.245 1.25 0.01 0.1 1 10 100 i k --cathode current (ma) v ka --cathode voltage (v) 1.22 1.225 1.23 1.235 1.24 1.245 1.25 -60 -30 0 30 60 90 120 t a -ambient temperature (c) v ref -reference voltage (v) -50 -40 -30 -20 -10 0 03 6912 15 18 21 v ka -cathode voltage (v) dv ref (mv)
5 date: 12/11/ 04 spx432 1.24v precision adjustable shunt regulator ? co pyright 2004 sipex corporation 10 100 1k 10k 100k 70 60 50 40 30 20 10 0 f frequency (hz) noise voltage nv/ hz v ka = v ref i k = 10ma t a = 25 c -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 z ka dynamic impedance ( ? ) v ka = v ref i k = 1 to 80ma f 1khz 10 100 1k 10k 100k 1m 10m start 10.000hz stop 10 000 000.000hz ref level 0.0deg 70.000db /div 45.000deg 10.000db marker 735 phase (a/r) marker 735 mag (a/r) 074.781hz 87.012deg 074.781hz 0.047db gain phase 60db 50db 40db 30db 20db 10db 0db -10db -20db -30db 215 180 135 90 45 0 -45 -90 -135 -180 -215 70db off state leakage; v ka = 18v, v ref = 0v. noise voltage vs frequency. typical performance characteristics 10 f 15k ? 3.03k ? gnd 230 ? i k v in v out low frequency dinamic output impedance vs t ambient . small signal gain and phase vs frequency; i k = 10ma, t a = 25 c. test circuit for gain and phase frequency response. 0.0001 0.0010 0.0100 0.1000 1.0000 10.0000 100.0000 1000.0000 -50 0 50 100 150 100 0.1 1.0 10 1k 10k 100 k 1 m 0.01 t a =25 c i k =1to 80ma z ka - dynamic impedance ( ? ) f - frequency (hz) 10 m dynamic output impedance t a = 25 c, i ka = 1 to 80ma.
6 date: 12/11 /04 spx432 1.24v precision adjustable shunt regulator ? co pyright 2004 sipex corporation i ka = 0 to 100ma. typical performance characteristics v in v out i ka = 0 to 1ma. v in v out test circuit for pulse response. gnd v in f p = 100khz 50 ? r v out i k i ka = 0 to 80ma. v in v out i ka = 0 to 50ma. v in v out i ka = 0 to 10ma. v in v out
7 date: 12/11 /04 spx432 1.24v precision adjustable shunt regulator ? co pyright 2004 sipex corporation r2 0.1% v in r3 r1 0.1% v out v ref spx432 q1 v in r2 r1 0.1% i sink spx432 r2 0.1% r3 r1 0.1% v out spx432 c2 c1 isolated feedback v out rtn + r3 sets feedback gain, c1 provides feedback compensation opto isolator typical performance characteristics shunt regulator, v out = (1+r1/r2)v ref . constant current sink i sink = v ref /r1. reference amplifier for isolated feedback in off-line dc-dc converters. precision high current series regulator, v out = (1+r1/r2)v ref . high current shunt regulator, v out = (1+r1/r2)v ref . v in r1 0.1% spx432 r3 r2 0.1% c1 r5 r4 v out v in r1 0.1% spx432 r3 r2 0.1% q1 v out single supply comparator with temperature compensated threshold, v in threshold = 1.24v. v cc r2 spx432 v in v out r1
8 date: 12/11 /04 spx432 1.24v precision adjustable shunt regulator ? co pyright 2004 sipex corporation package: 8 pin nsoic a a1 a2 side view seating plane section b-b with plating symbol min nom max a1.35- 1.75 a1 0.1 - 0.25 a2 1.25 - 1.65 b0.31- 0.51 c0.17- 0.24 d e e1 e l0.4-1 .27 l1 l2 ?0o-8o ?1 5o - 15o note: dimensions in (mm) 8 pin nsoic jedec mo-012 (aa) variation 4.90 bsc 6.00 bsc 3.90 bsc 1.27 bsc 1.04 ref 0.25 bsc gauge plane l1 l ? 1 ? seating plane l2 view c to p view b see view c b b e e/2 e1 index area (d/2 x e1/2) e1/2 d 1 e c base metal b
9 date: 12/11 /04 spx432 1.24v precision adjustable shunt regulator ? co pyright 2004 sipex corporation package: 3pin sot-23 a a2 a1 side view a a seating plane c c with plating base metal b e e1 e e1 d b 1 2 3 l1 l gauge plane view c see view c b b section b-b view a-a seating plane symbol min nom max a0.89- 1.12 a1 0.01 - 0.1 a2 0.88 0.95 1.02 b0.3 -0.5 c0.08-0.2 d2.82. 93.04 e e1 e0.95- 2.64 e1 1.2 1.3 1.4 l0.40. 50.6 l1 ?0o-8o note: dimensions in (mm) 3 pin sot-23 jedec to-236 (ab) variation 0.95 bsc 1.90 bsc 0.54 ref
10 date: 12/11 /04 spx432 1.24v precision adjustable shunt regulator ? co pyright 2004 sipex corporation package: 3pin to 92 d w l e1 e b a s1 a (2x) e r symbol min nom max a 0.17 - 0.195 b 0.014 - 0.02 e 0.13 - 0.155 e 0.95 - 0.105 e1 0.045 - 0.055 l 0.5 - 0.61 r 0.085 - 0.095 s1 0.045 - 0.06 w 0.016 - 0.022 d 0.175 - 0.195 a4o-6o note: dimensions in (inches) 3 pin to-92
11 date: 12/11 /04 spx432 1.24v precision adjustable shunt regulator ? co pyright 2004 sipex corporation corporation analog excellence sipex corporation reserves the right to make changes to any products described herein. sipex does not assume any liability aris ing out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor t he rights of others. sipex corporation headquarters and sales office 233 south hillview drive milpitas, ca 95035 tel: (408) 934-7500 fax: (408) 935-7600 part number acc output voltage packages spx432am .......................... 0.5% .............. 1.24v .................................. 3-pin sot-23 spx432am/tr .................... 0.5% .............. 1.24v .................................. 3-pin sot-23 spx432as .......................... 0.5% .............. 1.24v ................................... 8-pin nsoic spx432as/tr ..................... 0.5% .............. 1.24v ................................... 8-pin nsoic spx432an .......................... 0.5% .............. 1.24v .................................... 3-pin to-92 spx432an/tr .................... 0.5% .............. 1.24v .................................... 3-pin to-92 spx432m ............................ 1.0% .............. 1.24v .................................. 3-pin sot-23 spx432m/tr ...................... 1.0% .............. 1.24v .................................. 3-pin sot-23 spx432s ............................. 1.0% .............. 1.24v ................................... 8-pin nsoic spx432s/tr ....................... 1.0% .............. 1.24v ................................... 8-pin nsoic spx432n ............................. 1.0% .............. 1.24v .................................... 3-pin to-92 spx432n/tr ....................... 1.0% .............. 1.24v .................................... 3-pin to-92 ordering information /tr = tape and reel pack quantity is 2,000 for to-92 and 2500 for sot-23 and nsoic. available in lead free packaging. to order add "-l" suffix to part number. example: spx432am/tr = standard; spx432am-l/tr = lead free package pinouts sot-23-3 (m) 3 2 1 t op view spx432 bottom view to- 92 (n) 13 2 n/c cathode anode ref t op view 2 1 3 4 8 7 6 5 spx432 8-pin surface mount (s) cathode ref anode anode anode anode n/c cathode anode ref click here to order samples

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