rev. 10/5/00 as432 ultra 1.24v precision adjustable shunt regulator features applications ? low voltage operation........................................ 1.24v ? 3.0v to 3.3v switching power supplies ? trimmed bandgap to ................................... 0.5%/ 1% ? adjustable supplies ? wide operating current ................... 1ma to 100ma ? error amplifiers ? extended temperature range ............... 0 c to 105 c ? single supply amplifier ? adjustable output voltage...........................v ref to 18v ? monitors / vcr / tv ? low temperature coefficient ....................... 50 ppm/ c ? personal computers ? offered in to-92, soic, sot-89, sot-23-3 & sot-23-5 ? improved replacement in performance for tlv431 product description the as432 is a 3-terminal adjustable s hunt voltage regulator providing a highly accurate 1.24v bandgap reference with 0.5% tolerance. the as432 thermal stability, wide operating current (80ma) and temperature range (0 c to 105 c) makes it suitable for abroad range of applications. as432 tolerance of 0.5% is proven to be sufficient to overcome 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. the as432 is an ideal voltage reference in an isolated feedback circuit for 3.0v to 3.3v switching mode power supplies. as432 offers many advantages over tlv431, such as, wider output voltage up to 18v vs. 6v, output current of 80ma vs. 15ma, and a wide r temperature range with tighter tolerance down to 0.5%. ordering information part number temperature range package type as432an 0c to 105c to-92 AS432AM1 0c to 105c sot-89 as432as 0c to 105c so-8 AS432AM 0c to 105c sot-23-3 as432n 0c to 105c to-92 as432m1 0c to 105c sot-89 as432s 0c to 105c so-8 as432m 0c to 105c sot-23-3 top view 2 1 3 4 8 7 6 5 as432 8-pin surface mount (s) bottom view to-92 (n) 13 2 sot-23-3 (m) top view as432 cathode anode anode n/c ref anode anode n/c ref anode cathode anode ref cathode ref top view as432 sot-89 (m1) 1 2 3 anode cathode sot-23-5 (m5) as432 anode n/c cathode n/c top view ref pin connections
rev. 10/5/00 as432 marking information [ for sot-23 (3 and 5 pin) and sot-89 only ] device marking as432a 4321 as432 4322 absolute maximum ratings parameter symbol rating units cathode-anode reverse breakdown v da 18 v anode-cathode forward current i ak 1 a operating cathode current i ka 80 ma reference input current i ref 1 ma continuous power at 25 c to-92 8l soic sot-89 sot-23 p d 775 750 1000 200 mw mw mw mw junction temperature t j 150 c storage temperature t stg - 65 to +150 c lead temperature (soldering 10 sec.) tl 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 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 18 v to-92 160 c/w 80 c/w 6.3 mw/ c cathode current i k 10 ma soic 175 c/w 45 c/w 5.7 mw/ c sot-89 110 c/w 8 c/w 9.1 mw/ c sot-23 575 c/w 150 c/w 1.7 mw/ c 1.24v + - reference (r) cathode (k) anode (a)
rev. 10/5/00 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 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 as432 electrical characteristics are guaranteed 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. test as432a as432 parameter symbol circuit test condition min typ max min typ max unit output voltage v ref 1 1 i k = 10ma, t j = 25 c, v k = v ref 1.2338 1.240 1.2462 1.2276 1.240 1.2524 v line regulation v ref 1 v ka = 1.25v to 15v 19 37 19 37 mv load regulation v ref 1 i k = 1 to 80ma 3 6 3 6 mv temperature deviation v ref 1 0 < t j < 105 c 2 6 2 6 mv reference input current i ref 2 3 6 3 6 a reference input current temperature coefficient i ref 2 0 < t j < 105 c 0.3 0.6 0.3 0.6 a minimum cathode current for regulation i k (min) 1 0.6 1 0.6 1 ma off state leakage i k (min) 3 v ref = 0v, v ka = 18v 0.04 500 0.04 500 na calculating average temperature coefficient (tc) test circuits
rev. 10/5/00 as432 typical applications intel i 740 +3.3v 470f 0.1f phd 3055e 2.7v +12v 0.1f as432 120 ? 140 ? 500? 0.1f 1000f 0.1f *if the output voltage has noise, then please add a 0.1 f in between drain and gate of power mosfet to reduce the noise.
rev. 10/5/00 as432 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
rev. 10/5/00 as432 package drawing to-92 (n) 1 2 3 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. 10/5/00 as432 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. 10/5/00 as432 package drawing sot-23-5l (m5) millimeters symbol 0 0.90 0.30 0.80 ref 2.70 0.10 1.40 1.70 0.95 bsc. min 0.2 2.50 min. max min. max. a a1 a2 b c d e e e1 h l 0 .035 .012 .0315 ref .106 .004 .055 .066 .037 bsc. min .0078 .098 0.10 1.30 0.50 3.10 0.35 1.80 2.10 3.00 .004 .051 .019 .122 .0137 .071 .082 .118 inches note: 1. refer to applicable 2. controlling dimention : millimeter 3. package surface finishing to be smooth finish. l a1 c a2 a d b (5 places) h e e1 e
rev. 10/5/00 as432 package drawing sot-89 (m1) a 1 2 3 p k f g d b style 1 pin 1. base 2. collector 3. emitter style 3 pin 1. gate 2. anode 3. cathode style 2 pin 1. anode 2. cathode 3. no connection pin 1. drain 2. gate 3. source style 4 millimeters inches dim min max min max a 4.40 4.60 0.174 0.181 b 2.29 2.60 0.091 0.102 c 140 160 0.056 0.062 d 0.36 0.48 0.015 0.018 e 1.62 1.80 0.064 0.070 f 0.44 0.53 0.018 0.020 g j 0.35 0.44 0.014 0.017 k 0.80 1.04 0.032 0.040 l 300 bsc 0.118 bsc n 2.04 2.28 0.081 0.089 p 3.94 4.25 0.156 0.167 150 bsc 0.059 bsc -t- n c j
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