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rev. 10/3/00 micropower sot-23, 2.5v precision adjustable shunt regulator features applications ? extremely low i min ........................................... 100 a ? voltage tolerance trimmed ............................ 0.5% ? battery operating equipment ? notebook/ pda ? wide operating current .................. 100 a to 100ma ? adjustable supplies ? extended temperature range ............... 0 c to 105 c ? power supply adapter ? low temperature coefficient ........................30 ppm/ c ? offered in small low power sot-23 package ? alternative source tl431 ? switching power supplies ? error amplifiers ? single supply amplifier product description the AS2431L is a 3-terminal adjustable s hunt voltage regulator providing extremely low operating current of 100 a with a highly accurate 0.5% bandgap reference. AS2431L acts as an open-loop error amplifier with a 2.5v temperature compensation reference. the AS2431L thermal stability, wide operating current (100ma) and temperature range (105 c) makes it suitable for a broad range of applications. AS2431L 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 line and contribute a significant cost savings. in the standard shunt configuration, the combination of low temperature coefficient (t.c.), sharp turn-on characteristics, low output impedance and programmable output voltage makes this precision reference an excellent error amplifier. ordering information so-8 to-92 sot-23 3-pin AS2431Lys AS2431Lyn AS2431Lym y = output accuracy: y= a (0.5%) or blank (1%) pi n conn e c ti ons top view 2 1 3 4 8 7 6 5 AS2431L so-8 (s) sot-23-3 (m) top view AS2431L bottom view to-92 (n) ref anode anode n/c cathode anode anode n/c ref anode cathode ref cathode anode 13 2 AS2431L
rev. 10/3/00 AS2431L marking information part number tolerance marking AS2431L 1.0% boxx (xx subjected to lot number) AS2431La 0.5% b1xx (xx subjected to lot number) the AS2431Lam is 0.5% tolerance and the marking on the pin should be ?2431? the AS2431Lm is 1% tolerance and the marking on the part will be ?2432? absolute maximum ratings parameter symbol rating units cathode-anode reverse breakdown v ka 30 v anode-cathode forward current i ak 1 a operating cathode current i ka 100 ma reference input current i ref 1 ma continuous power dissipation at 25 c, so-8 to-92 sot-23 p d p d p d 710 780 300 mw mw mw junction temperature t j 150 c storage temperature t stg - 65 to 150 c lead temperature (soldering 10 sec.) t l 260 c stresses greater than those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress r ating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specificatio n is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability. recommended conditions typical thermal resistances parameter symbol rating unit package ja jc typical derating cathode voltage v ka v ref to 20 v so-8 175 c/w 45 c/w 5.7 mw/ c cathode current i k 10 ma to-92 160 c/w 80 c/w 6.3 mw/ c sot-23 575 c/w 150 c/w 1.7 mw/ c 2.5v + - reference (r) cathode (k) anode (a)
rev. 10/3/00 AS2431L electrical characteristics are guaranteed over full junction temperature range (0 c to 105 c). ambient temperature must be derated based on power dissipation and package thermal characteristics. the conditions are: v ka = v ref and i k = 10ma, unless otherwise specified. AS2431La AS2431L parameter symbol test condition test circuit min typ max min typ max unit reference voltage v ref t a = 25 c 1 2.490 2.503 2.515 2.470 2.495 2.520 v over temp. 1 2.469 2.536 2.449 2.541 v ? v ref with temp* tc 1 0.07 0.20 0.07 0.20 mv/ c ratio of change in v ref ? v ref v ref to 10v -2.7 -1.01 -2.7 -1.01 to cathode voltage ? v k 10v to 20v 2 -2 -0.4 0.3 -2 -0.4 0.3 reference input current i ref 2 0.7 4 0.7 4 a i ref temp deviation ? i ref 2 0.4 1.2 0.4 1.2 a min i k for regulation i k (min) 1 100 100 a off state leakage i k (off) v ref = 0v v ka = 18v 3 0.04 500 0.04 500 na dynamic output impedance z ka f < 1 khz i k = 0.1 to 100ma 1 0.15 0.5 0.15 0.5 ? minimum operating current i min v z = v ref 1 100 100 a calculating average temperature coefficient (tc) mv/v ppm mv tc in mv/c = ? v ref (mv) ? t a tc in %/c = v ref at 25c ? t a ? v ref ) ) x 100 tc in ppm/c = v ref at 25c ? t a ? v ref ) ) x 10 6 5000 ? -55 0.06 mv/c ? v ref 0 0 0 % -20 -10 0.5 temperature (c) 0.002 %/c 24 ppm/c -25 0 25 50 75 100 125
rev. 10/3/00 AS2431L test circuits i k i ref v in v ka = v ref v in v ka i k r 1 r 2 (v ref ) figure 1b. test circuit 2 figure 1a. test circuit 1 v in v ka i k (off) figure 1c. test circuit 3 i ref
rev. 10/3/00 AS2431L typical performance curves v r ef - reference voltage (v) v ka - cathode voltage (v) high current operating characteristics figure 3 -2 -1 0 1 2 3 -100 -75 -50 -25 0 25 50 75 100 125 150 i k - cathode current (ma) v ka = v ref temperature range: - 0c to 105 c figure 4 off state leakage -60 -30 0 30 60 90 120 0.01 0.1 1 10 100 t a - ambient temperature ( c) i z off - off state cathode current (na) v ka = 36v v ref = 0v figure 5 t a - ambient temperature ( c) 90 120 reference voltage vs. ambient temperature -60 -30 0 30 60 2.45 2.46 2.47 2.48 2.49 2.50 2.51 2.52 2.53 v ka = v ref i k = 10 ma v ref figure 2 low current operating characteristics v ka - cathode voltage (v) 900 800 700 600 500 400 300 200 100 0 -100 -200 1.0 -1.0 2.0 0 3.0 i k - cathode current ( a) v ka = v ref temperature range: -0c to 125 c 105 c 25 c -0 c =2.503v (as2431a) =2.495v (as2431)
rev. 10/3/00 AS2431L typical performance curves figure 8 f - frequency (hz) noise voltage nv/ hz 20 10 10 100 1 k 10 k 100 k 0 noise voltage 70 30 40 50 60 v ka = v ref i k = 10 ma t a = 25c t a - free air temperature figure 9 low frequency dynamic output impedance z k a - dynamic impedance ( ? ? ? ? ) -60 -30 0 30 60 90 120 0.0 v ka = v ref i ka = 1 to 100 ma f < 1 khz 0.025 0.050 0.075 0.100 0.125 0.150 figure 7 reference voltage line regulation v ka - cathode voltage (v) v ref - change in reference voltage (mv) 0 -10 -20 -30 -40 -50 t a - ambient temperature ( c) figure 6 reference input current i r ef - reference input current ( a) -60 -30 0 30 60 90 120 0 r1 = 10 k ? r2 = i k = 10 ma 0.5 1.0 1.5 2.0 2.5 3.0 18 0 3 6 9 12 15 105 c 75 c 25 c 0 c
rev. 10/3/00 AS2431L typical performance curve figure 11 10 m dynamic output impedance figure 10 f - frequency (hz) z ka - dynamic impedance 100 0.1 1.0 10 1 k 10 k 100 k 1 m 0.01 t a = 25 c i k = 1 to 100 ma 9 f 15 k 8.25 k gnd out 230 ? i k small signal voltage gain vs. frequency f - frequency (hz) a v - small signal voltage gain (db) 70 20 30 40 10 50 60 1 k 10 k 100 k 1 m 10 m 0 temperature range: -0c to 105 c i k = 10 ma
rev. 10/3/00 AS2431L typical performance curves out gnd 220 ? f p = 100 khz input monitor 50 ? pulse response figure 12 t - time ( s) input and output voltages (v) 12 -1 0 1 2 3 4 5 6 11 10 9 8 7 6 5 4 3 2 1 0 150 ? 10 k i k c l stability boundary conditions figure 13 c l - load capacitance (pf) i k - cathode current (ma) output input 10 7 10 6 10 5 10 4 10 3 10 2 10 1 10 0 0 10 20 30 40 50 60 70 80 90 100 stability region t a = 25 c a: v ka = v ref b: v ka = 5v at i k = 10 ma c: v ka = 10v at i k = 10 ma d: v ka = 15v at i k = 10 ma d c a b
rev. 10/3/00 AS2431L package drawing sot-23-3l (m) 0.015 - 0.018 (0.381 - 0.457) 0.020 - 0.024 (0.508 - 0.610) 0.110 - 0.120 (2.794 - 3.048) 0.001 - 0.004 (0.025 - 0.102) 0.030 - 0.041 (0.762 - 1.041) 0.018 - 0.024 (0.457 - 0.610) 0.070 - 0.080 (1.778 - 2.032) 0.035 - 0.040 (0.889 - 1.016) 0.047 - 0.055 (1.194 - 1.397) 0.083 - 0.098 (2.108 - 2.489) 0.003 - 0.005 (0.076 - 0.127)
rev. 10/3/00 AS2431L package drawing to-92 (n) 3 2 1 0.055 (1.397) 0.045 (1.143) 0.145 (3.683) 0.135 (3.429) 10 typ. bottom view 0.185 (4.699) 0.045 (1.143) 0.185 (4.699) 0.175 (4.445) 0.085 (2.159) diameter 0.090 (2.286) typ. seating plane 0.016 (0.406) 0.014 (0.356) 0.055 (1.397) 0.045 (1.143) 0.105 (2.667) 0.095 (2.413) 0.500 (12.70) min. 0.025 (0.635) max uncontrolled lead diameter 5 typ. 5 typ. 0.090 (2.286) radius typ. 0.0155 (0.3937) 0.0145 (0.3683)
rev. 10/3/00 AS2431L package drawing soic-8 (s) pin 1 1.27 (0.50) bsc 3.8 (0.150) 4.0 (0.158) 4.6 (0.181) 5.2 (0.205) 5.8 (0.228) 6.2 (0.244) 4.8 (0.188) 5.0 (0.197) 0.49 (0.019) 0.56 (0.022) 0.35 (0.014) 0.45 (0.018) 0.10 (0.004) 0.20 (0.008) 0.19 (0.007) 0.22 (0.009) 1.35 (0.053) 1.75 (0.069) 0.61 (0.024) 0.78 (0.031) 3 -6 0.64 (0.025) 0.77 (0.030) 45 7 (4 plcs) 7 (4 plcs) 0.37 (0.015) bsc

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