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1 date: 5/25/04 spx431l precision adjustable shunt regulator ? copyright 200 4 sipex corporation5 precision adjustable shunt regulator spx431l description features tight voltage tolerance 0.5% at 10ma wide operating current 1ma to 100ma extended temperature range: 0 c to 105 c low temperature coefficient 30 ppm/ c improved replacement in performance for tl431 and as431 low cost solution ? the spx431l is a 3-terminal adjustable shunt voltage regulator providing a highly accurate bandgap reference. the spx431l acts as an open-loop error amplifier with a 2.5v temperature compensation reference. the spx431l?s thermal stability, wide operating current (100ma) and temperature range (0 c to 105 c) makes it suitable for a variety of applications that require a low cost, high performance solution. spx431l 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 manufacturer's assembly line and contribute a significant cost savings. the output voltage may be adjusted to any value between v ref and 20v with two external resistors. the spx431l is available in to-92, soic-8, sot-89, and sot-23-3 packages. error amplifiers single supply amplifier monitors / vcrs / tvs personal computers block diagram + - 2.5v reference (r) anode (a) cathode (k) applications battery operating equipment adjustable supplies switching power supplies spx431l 3 pin sot-23 anode ref cathode 1 now available in lead free packaging
2 date: 5/25/04 spx431l precision adjustable shunt regulator ? copyright 200 4 sipex corporation5 absolute maximum ratings cathode-anode reverse breakdown v ka ....................................... 20v anode-cathode forward current, (<10ms) i ak ................................. 1a operating cathode current i ka .................................................. 100ma reference input current i ref ........................................................ 10ma continuos power dissipation at 25 c p d to-92 ..................................................................... 775mw sot-23 .................................................................. 200 mw soic-8 .................................................................... 750mw sot-89 ................................................................. 1000mw junction temperature t j ........................................................... 150 c storage temperature t stg .............................................. -65 to 150 c lead temperature (soldering 10 sec.) t l .................................. 300 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 specification is not implied. exposure to absolute maximum rating condi- tions for extended periods may affect reliability. recommended conditions parameter symbol rating unit cathode voltage v ka v ref to 20 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 6.3 mw/ c sot-23 575 c/w 150 c/w 1.7 mw/ c soic-8 175 c/w 45 c/w 5.7 mw/ c sot-89 110 c/w 8 c/w 9.1 mw/ c typical deratings of the thermal resistances are given for ambient temperature >25 . electrical characteristics at 25 c i k = 10ma v k = v ref , unless otherwise specified. parameter symbol figure conditions min typ max units spx431la reference voltage v ref 2 2.490 2.503 2.515 v ? v ref withtemp.* tc 2 0.07 0.20 mv/ c ratio of change in v ref ? v ref 3v ref to 10v -2.7 -1.0 mv/v to cathode voltage ? v k 10v to 20v -2.0 -0.4 0.3 reference input current i ref 3 0.7 4.0 a i ref temp deviation ? i ref 3t j = 0 c to 105 c 0.4 1.2 a min i k for regulation i k(min) 2 0.4 1.0 ma off state leakage i k(off) 4v ref = 0v, v ka = 20v 0.04 1.0 a dynamic output z ka 2? z 1khz 0.15 0.5 ? impedance i k = 1 to 100ma spx431l reference voltage v ref 2 2.470 2.495 2.520 v ? v ref withtemp.* tc 2 0.07 0.20 mv/ c ratio of change in v ref ? v ref 3v ref to 10v -2.7 -1.0 mv/v to cathode voltage ? v k 10v to 20v -2.0 -0.4 0.3 reference input current i ref 3 0.7 4.0 a i ref temp deviation ? i ref 3t j = 0 c to 105 c 0.4 1.2 a min i k for regulation i k(min) 2 0.4 1.0 ma off state leakage i k(off) 4v ref = 0v, v ka = 20v 0.04 1.0 a dynamic output z ka 2? z 1khz 0.15 0.5 ? impedance i k = 1 to 100ma electrical characteristics
3 date: 5/25/04 spx431l precision adjustable shunt regulator ? copyright 200 4 sipex corporation5 parameter symbol figure conditions min typ max units spx431lc reference voltage v ref 2 2.445 2.495 2.545 v ? v ref withtemp.* tc 2 0.07 0.20 mv/ c ratio of change in v ref ? v ref 3v ref to 10v -2.7 -1.0 mv/v to cathode voltage ? v k 10v to 20v -2.0 -0.4 0.3 reference input current i ref 3 0.7 4.0 a i ref temp deviation ? i ref 3t j = 0 c to 105 c 0.4 1.2 a min i k for regulation i k(min) 2 0.4 1.0 ma off state leakage i k(off) 4v ref = 0v, v ka = 16v 0.04 1.0 a dynamic output z ka 2? z 1khz 0.15 0.5 ? impedance i k = 1 to 100ma ? t ? v re f 0153 045607590105 -10 0.5 5000 0 00 0.07 mv / c 0.003 %/ c 27 ppm/ c ppm % mv junction temperature ( c) ? tc in ppm/ c = ? tc in %/ c = ? tc in mv/ c = ? v ref (mv) ? t a ( ? v ref at 25 c ) ? t a ? v ref x 100 ( ? v ref at 25 c ) ? t a ? v ref x 10 6 calculating average temperature coefficient (tc) figure 1. v ref vs temperature. operating range (t j ) = 0 c to 105 c. * see appropiate test circuit (figure 2) electrical characteristics electrical characteristics at 25 c i k = 10ma v k = v ref , unless otherwise specified.
4 date: 5/25/04 spx431l precision adjustable shunt regulator ? copyright 200 4 sipex corporation5 -2 -1 0 1 2 3 150 125 100 75 50 25 0 -25 -50 -75 -100 v ka cathode voltage (v) i k cathode current (ma) v ka = v ref 0 c to 105 c -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 typical performance characteristics figure 5. high current operating characteristics figure 6. reference voltage vs ambient tempetature 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 -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 105 c 105 c 25 c -0 c -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 figure 7. low current operating characteristics. figure 8. reference input current vs ambient temperature.
5 date: 5/25/04 spx431l precision adjustable shunt regulator ? copyright 200 4 sipex corporation5 typical performance characteristics 0 36912 15 18 21 24 27 30 0 -10 -20 -30 -40 -50 v ka cathode voltage (v) ? v ref (mv) 0 c 25 c 75 c 125 c i ka = 10ma figure 9. reference voltage line regulation vs cathode voltage and t ambient 10 100 1k 10k 100k 70 60 50 40 30 20 10 0 f frecuenc y (hz) noise voltage nv/hz v ka = v ref i k = 10ma t a = 25 c figure 10. noise voltage vs frequency -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 100ma f 1khz figure 11. low frequency dynamic output impedance vs t ambient 10 100 1k 10k 100k 1m 10m start 10.000hz stop 50 000 000.000hz ref level 60.000db 0.0deg /div 10.000db 45.000deg marker 25 297 mag (a/r) marker 25 297 phase (a/r) 698.000 hz -0.025 db 698.000 hz 93.320 deg gain phase 60db 50db 40db 30db 20db 10db 0db -10db -20db -30db -40db 215 180 135 90 45 0 -45 -90 -135 -180 -215 figure 12. small signal gain and phase vs frequency; i k = 10ma, t a = 25 c i k v in 9 f 15k ? 8.25k ? v out gnd 230 ? figure 13. test circuit for gain and phase frequency response v in v out v in v out figure 14. f z = 100khz, i k = 10ma, t a = 25 c
6 date: 5/25/04 spx431l precision adjustable shunt regulator ? copyright 200 4 sipex corporation5 figure 15. test circuit for pulse response figure 16. stability boundry conditions figure 17. test circuit for stability figure 18. dynamic output impedance t a = 25 c, i k = 1 to 100ma figure 19. off state leakage figure 20. shunt regulator v out = (1+r1/r2)v ref 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 = 25 c 150 ? 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 = 20v v ref = 0v 1k 10k 100k 1m 10m 100 10 1.0 0.1 0.01 f frecuenc y ( hz ) z ka dynamic impedance ( ? ) t a = 25 c i k = 1 to 100ma r2 0.1% v in r3 r1 0.1% v out v ref spx431l typical performance characteristics
7 date: 5/25/04 spx431l precision adjustable shunt regulator ? copyright 200 4 sipex corporation5 figure 21. constant current sink, i sink = v ref /r1 figure 22. reference amplifier for isolated feedback in off-line dc-dc converters 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 temperature compensated threshold. v in threshold = 2.5v. q1 v in r2 r1 0.1% i sink spx431l r2 0.1% r3 r1 0.1% v out spx431l c2 c1 isolated feedback v out rtn + r3 sets feedback gain, c1 provides feedback compensation opto isolator v in r1 0.1% spx431l r3 r2 0.1% c1 r5 r4 v out v in r1 0.1% spx431l r3 r2 0.1% q1 v out v cc r2 spx431l v in v out r1 * resistor values are chosen such that the effect to i ref is negligible . typical performance characteristics
8 date: 5/25/04 spx431l precision adjustable shunt regulator ? copyright 200 4 sipex corporation5 pinouts bottom view t o-92 (n) 13 2 n/c cathode anode ref t op view 2 1 3 4 8 7 6 5 8-pin soic (s) cathode ref anode anode anode anode n/c sot-23-3 (m) 3 2 t op view t op view sot-89 (m1) 1 2 3 ref anode cathode anode cathode ref 1 see view c ? ?1 1.65 dimensions minimum/maximum (mm) 8 pin nsoic (jedec ms-012, aa - variation) common height dimension a a1 a2 b c l e e1 e l2 l1 1.35 4.90 bsc 0.40 0.31 0.51 symbol min nom max 0.10 - 0.25 d 1.75 1.25 0.17 0.25 6.00 bsc 3.90 bsc 1.27 bsc 1.27 1.04 ref 0.25 bsc 0o 5o 8o 15o - - - - - - - a a2 a1 seating plane side view l1 l 1 1 seating plane gauge plane l2 view c to p view e e e/2 e1 a index area (d/2 x e1/2) e1/2 d b 1 8 pin nsoic p ackage: c with plating base metal b contact area package: 8 pin nsoic
9 date: 5/25/04 spx431l precision adjustable shunt regulator ? copyright 200 4 sipex corporation5 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 0.89 - 1.12 0.01 - 0.10 dimensions in (mm) 3 pin sot-23 jedec to-236 (ab) variation 0.88 0.95 1.02 0.30 - 0.50 0.08 - 0.20 0.40 0.50 0.60 0.54 ref 0? - 8 a a1 a2 b c d e e1 l l1 min nom max 2.80 2.90 3.04 2.10 - 2.64 1.20 1.30 1.40 e e1 0.95 bsc 1.90 bsc section b-b view a-a seating plane 3 pin sot-23 package: 3 pin sot-23
10 date: 5/25/04 spx431l precision adjustable shunt regulator ? copyright 200 4 sipex corporation5 h e e e1 d d1 1 2 3 1.40 1.50 1.60 dimensions in (mm) 3 pin sot-89 0.36 0.42 0.48 4.40 4.50 4.60 a b1 c d h e l min nom max 1.40 1.60 1.75 3.94 - 4.25 e e1 1.0 c 5o(2x) bb1 b ro.15 8o(2x) b 0.41 0.47 0.53 0.38 0.40 0.43 d1 1.45 1.50 1.55 2.90 3.00 3.10 2.40 2.50 2.60 0.80 - 1.20 l 3 pin sot-89 package: 3 pin sot-89
11 date: 5/25/04 spx431l precision adjustable shunt regulator ? copyright 200 4 sipex corporation5 d w l e1 e b a s1 a (2x) e r dimensions in inches 3 pin to-92 a b e e e1 w s1 r l .170 .016 .095 .105 symbol min nom max .014 - .020 .195 .130 .045 .055 0.022 .175 4o .195 6o - - - - - - - .500 .610 - - - .085 .095 .045 .060 d a .155 3 pin to-92 package: 3 pin to-92
12 date: 5/25/04 spx431l precision adjustable shunt regulator ? copyright 200 4 sipex corporation5 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 accuracy output voltage packages spx431lam ........................ 0.5% .............. 2.503v ................................ 3-pin sot-23 spx431lam/tr .................. 0.5% .............. 2.503v ................................ 3-pin sot-23 spx431lam1 ...................... 0.5% .............. 2.503v ................................ 3-pin sot-89 spx431lam1/tr ................ 0.5% .............. 2.503v ................................ 3-pin sot-89 spx431las ........................ 0.5% .............. 2.503v .................................. 8-pin nsoic spx431las/tr ................... 0.5% .............. 2.503v .................................. 8-pin nsoic spx431lan ........................ 0.5% .............. 2.503v .................................. 3-pin to-92 spx431lan/tr .................. 0.5% .............. 2.503v .................................. 3-pin to-92 spx431lm .......................... 1.0% .............. 2.495v ................................ 3-pin sot-23 spx431lm/tr .................... 1.0% .............. 2.495v ................................ 3-pin sot-23 spx431lm1 ........................ 1.0% .............. 2.495v ................................ 3-pin sot-89 spx431lm1/tr .................. 1.0% .............. 2.495v ................................ 3-pin sot-89 spx431ls ........................... 1.0% .............. 2.495v .................................. 8-pin nsoic spx431ls/tr ..................... 1.0% .............. 2.495v .................................. 8-pin nsoic spx431ln ........................... 1.0% .............. 2.495v .................................. 3-pin to-92 spx431ln/tr ..................... 1.0% .............. 2.495v .................................. 3-pin to-92 spx431lcm ........................ 2.0% .............. 2.495v ................................ 3-pin sot-23 spx431lcm/tr .................. 2.0% .............. 2.495v ................................ 3-pin sot-23 spx431lcm1 ...................... 2.0% .............. 2.495v ................................ 3-pin sot-89 spx431lcm1/tr ................ 2.0% .............. 2.495v ................................ 3-pin sot-89 spx431lcs ........................ 2.0% .............. 2.495v .................................. 8-pin nsoic spx431lcs/tr .................. 2.0% .............. 2.495v .................................. 8-pin nsoic spx431lcn ........................ 2.0% .............. 2.495v .................................. 3-pin to-92 spx431lcn/tr .................. 2.0% .............. 2.495v .................................. 3-pin to-92 ordering information available in lead free packaging. to order add ?-l? suffix to part number. example: spx431lm/tr = standard; spx431lm-l/tr = lead free /tr = tape and reel pack quantity is 2,000 for to-92, 2,500 for sot-89, sot-23, and sot-23.

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