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1 date: 05/25/04 spx1431 precision adjustable shunt regulator ? copyrig ht 2004 sipex corporation precision adjustable shunt regulator spx1431 description features trimmed bandgap reference to 0.4% wide operating current 1ma to 150ma extended temperature range: -55 c to 125 c low temperature coefficient 30 ppm/ c offered in to-92, soic, sot-89, sot-23-5 improved replacement in performance for lt1431 low cost solution ? the spx1431 is a 3-terminal adjustable shunt voltage regulator providing a highly accurate bandgap reference. the spx1431 acts as an open-loop error amplifier with a 2.5v temperature compensation reference. the spx1431's thermal stability, wide operating current (150ma) and temperature range (-55 c to 125 c) makes it suitable for a variety of applications that require a low cost, high performance solution. spx1431 tolerance of 0.4% 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 lines and contributes a significant cost savings. the output voltage may be adjusted to any value between v ref and 36 volts with two external resistors. the spx1431 is available in to-92, soic-8, sot-89, and sot-23-5 packages. block diagram + - 2.5v reference (r) anode (a) cathode (k) applications battery operating equipment adjustable supplies switching power supplies error amplifiers single supply amplifier monitors / vcrs / tvs personal computers now available in lead free packaging 1 2 3 4 5 6 7 8 anode cathode n/c ref anode anode anode n/c spx1431 8 pin nsoic
2 date: 05/25/04 spx1431 precision adjustable shunt regulator ? copyrig ht 2004 sipex corporation absolute maximum ratings cathode-anode reverse breakdown v ka ....................................... 37v anode-cathode forward current, (<10ms) i ak ................................. 1a operating cathode current i ka .................................................. 150ma reference input current i ref ........................................................ 10ma continuous 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. 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 9.1mw/c typical deratings of the thermal resistances are given for ambient temperature >25 c. electrical characteristics at 25 c i k = 10ma v k = v ref , unless otherwise specified. parameter symbol figure conditions min typ max units spx1431 reference voltage v ref 2 2.490 2.500 2.510 v 2t j = 0 c to 105 c 2.465 2.535 v ? v ref withtemp.* tc 2 0.07 0.20 mv/ c ratio of change in v ref ? v ref 3v k = 3v to 36v -2.0 -1.1 mv/v to cathode voltage ? v k reference input current i ref 3 0.7 1.9 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 ma off state leakage i k(off) 4v ref = 0v, 0.04 250 na v ka = 36v dynamic output z ka 2? z 1khz 0.15 0.5 ? impedance i k = 1 to 150ma operating range (t j ) = - 55 c to 125 c. * see appropiate test circuit (figure 2) recommended conditions parameter symbol rating unit cathode voltage v ka v ref to 36 v cathode current i k 10 ma electrical characteristics
3 date: 05/25/04 spx1431 precision adjustable shunt regulator ? copyrig ht 2004 sipex corporation ? 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. 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: 05/25/04 spx1431 precision adjustable shunt regulator ? copyrig ht 2004 sipex corporation -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 figure 5. high current operating characteristics figure 6. reference voltage vs ambient tempetature -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 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 frequency (hz) noise voltage nv hz v ka = v ref i k = 10ma t a = 25 c figure 10. noise voltage vs frequency typical performance characteristics
5 date: 05/25/04 spx1431 precision adjustable shunt regulator ? copyrig ht 2004 sipex corporation -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 19 422 mag (a/r) marker 19 422 phase (a/r) 611.000hz -0.125db 611.000hz 46.717deg phase gain 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 figure 14. frequency = 100khz, i k = 10ma, t a = 25 c figure 15. test circuit for pulse response figure 16. stability boundary 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 = 25 c v out v in v out v in typical performance characteristics
6 date: 05/25/04 spx1431 precision adjustable shunt regulator ? copyrig ht 2004 sipex corporation 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 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 = 36v v ref = 0v t a =25 c i k = 1ma to 100ma z ka - dynamic 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 spx1431 figure 21. constant current, sink, i sink = v ref /r1 figure 22. reference amplifier for isolated feedback in off-line dc-dc converters q1 v in r2 r1 0.1% i sink spx1431 r2 0.1% r3 r1 0.1% v out spx1431 c2 c1 isolated feedback v out rtn + r3 sets feedback gain, c1 provides feedback compensation opto isolator typical performance characteristics
7 date: 05/25/04 spx1431 precision adjustable shunt regulator ? copyrig ht 2004 sipex corporation 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 v in r1 0.1% spx1431 r3 r2 0.1% c1 r5 r4 v out v in r1 0.1% spx1431 r3 r2 0.1% q1 v out v cc r2 spx1431 v in v out r1 * resistor values are chosen such that the effect to i ref is negligible . typical performance characteristics sot-23-5 (m5) 3 2 1 top view 54 top view sot-89 (m1) 1 2 3 bottom view to-92 (n) 13 2 n/c ref anode cathode ca t hode anode ref top view 2 1 3 4 8 7 6 5 8-pin surface mount (s) ca t hode ref anode anode anode anode n/c n/c n/c cathode anode ref package pinouts
8 date: 05/25/04 spx1431 precision adjustable shunt regulator ? copyrig ht 2004 sipex corporation package: 8 pin nsoic ? ?1 1.65 to p view 8 pin nsoic section b-b c base metal b b see view c l1 l ? ?1 ?1 seating plane l2 view c with plating dimensions in (mm) 8 pin nsoic (jedec ms-012, aa - variation) a a1 a2 b c l e e1 e l2 l1 1.35 0.40 0.31 0.51 symbol min nom max 0.10 - 0.25 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 gauge plane - - - - - - - b b d 4.90 bsc e e/2 e1 index area (d/2 x e1/2) e1/2 d 1 e a a2 a1 side view seating plane
9 date: 05/25/04 spx1431 precision adjustable shunt regulator ? copyrig ht 2004 sipex corporation package: 5 pin sot-23 a a2 a1 side view d e e/2 e1 n/2 2 1 b e e1 e1/2 n n/2 +1 l1 l l2 ?1 seating plane gauge plane view c see view c b b c with plating base metal b ?1 ? - - 1.45 0 - 0.15 dimensions in (mm) 5 pin sot-23 jedec mo-178 (aa) variation 0.90 1.15 1.30 0.30 - 0.50 0.08 - 0.22 2.90 bsc 2.80 bsc 1.60 bsc 0.30 0.45 0.60 0.60 ref 0o 4o 8o a a1 a2 b c d e e1 l l1 l2 ? 5o 10o 15o ?1 min nom max 0.25 bsc e e1 1.90 bsc 0.95 bsc section b-b seating plane view a-a 5 pin sot-23
10 date: 05/25/04 spx1431 precision adjustable shunt regulator ? copyrig ht 2004 sipex corporation 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: 05/25/04 spx1431 precision adjustable shunt regulator ? copyrig ht 2004 sipex corporation 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: 05/25/04 spx1431 precision adjustable shunt regulator ? copyrig ht 2004 sipex corporation corporation analog excellence 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 spx1431m5 ......................... 0.4% ..................... 2.5v ............................ 5-pin sot-23 spx1431m5/tr ................... 0.4% ..................... 2.5v ............................ 5-pin sot-23 spx1431m1 ......................... 0.4% ..................... 2.5v ............................ 3-pin sot-89 spx1431m1/tr ................... 0.4% ..................... 2.5v ............................ 3-pin sot-89 spx1431s ............................ 0.4% ..................... 2.5v ............................. 8-pin nsoic spx1431s/tr ...................... 0.4% ..................... 2.5v ............................. 8-pin nsoic spx1431n ............................ 0.4% ..................... 2.5v .............................. 3-pin to-92 spx1431n/tr ...................... 0.4% ..................... 2.5v .............................. 3-pin to-92 ordering information available in lead free packaging. to order add "-l" suffix to part number. example: spx1431s/tr = standard; spx1431s-l/tr = lead free /tr = tape and reel pack quantity is 2,000 for to-92 and 2,500 for nsoic, sot-23 or sot-89.

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