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amc d oc . #: amc431_c november 2002 copyright ? 2002, add microtech corp. 1 www.addmtek.com v ref cathode anode description features the amc431 is a three-terminal adjustable shunt voltage regulator with specified thermal stability and pin-to-pin compatible with the earlier 431 series. the output voltage can be adjusted to any value between v ref and 36v by using two external resistors. the amc431 offers low output impedance for improved load regulation with a typical output impedance of 200m ? . because of the active output circuitry, the amc431can replace the zener diodes in applications such as switching power supplies, ovp crowbar circuits, references for a/d, d/a converters with improved turn-on characteristics. initial voltage reference accuracy of 0.5%, 1.0%, and 1.5% sink current capability from 1ma to 100ma typical output dynamic impedance less than 200m ? ? ? ? ; adjustable output voltage from v ref to 36v available in 3l-to92 and surface mount sot89, sot23 and 8 pin s.o.i.c. packages low output noise typical equivalent full range temperature coefficient of 30ppm/c pin assignment identical to earlier tl431 series. applications package pin out 3-pin plastic to-92 (top view) 8-pin plastic s.o.i.c. surface mount (top view) voltage reference precision shunt regulator high current shunt regulator pwm down converter with reference voltage monitor order information soic to-92 sot-89 sot-23 sot-23 t a (c) initial tolerance dm 8-pin lp 3-pin pk 3-pin db 3-pin db 3-pin 1.5% -- amc431clp -- -- -- 1% amc431dm amc431lp amc431pk amc431db amc431rdb 0 to 70 0.5% -- AMC431BLP amc431bpk amc431bdb amc431brdb note: 1. for amc431db and amc431bdb. 2. for amc431rdb and amc431brdb. 3. for surface-mount and to-92 packages in tape & reel, add suffix ?t? (e.g., amc431lpt, amc431dbt). 4. for to-92 in tape & box (without reel), add suffix ?tb? (e.g., amc431lptb). 5. db package is only available in tape & reel. p recision a djustable s hunt v oltage r eference amc431 ? a a a a dd microtech corp. cathode anode v ref cathode anode v ref anode nc anode anode nc v ref anode cathode cathode v ref anode 3-pin plastic sot-89 surface mount (top view) (note 1) 3-pin plastic sot-23 surface mount (top view) (note 2) 3-pin plastic sot-23 surface mount (top view)
amc d oc . #: amc431_c amc431 november 2002 p recision a djustable s hunt v oltage r egulators copyright ? 2002, add microtech corp. 2 www.addmtek.com typical application block diagram 5v precision regulator + - absolute maximum ratings (note 1) cathode to anode voltage (v ka ) (note 2) -0.3v to 37v continuous cathode current (i k ) -100ma to 150ma reference input current (i ref ) -50ua to 10ma maximum junction temperature range, t j 150c storage temperature range -65 o c to 150 o c lead temperature (soldiering, 10 seconds) 260c note 1: exceeding these ratings could cause damage to the device. all voltages are with respect to ground. currents are positive into, negative out of the specified terminal. note 2: voltage values are with respect to the anode terminal unless otherwise noted. power dissipation table package ja (c /w ) derating factor d f (mw/c) t a 25c t a 25c power rating(mw) t a =70c power rating(mw) t a = 85c power rating (mw) dm 165 6.06 757 485 394 lp 156 6.41 801 513 417 pk 71(note) 14.1 1763 1128 916 db 285 3.5 438 280 228 note : 1. for pk package, thermal resistance-junction to tab ( jt ) = 35c /w. t j = t tab + (p d jt ). p d : power dissipation. 2. ja : thermal resistance-junction to ambient, d f = 1/ ja junction temperature calculation: t j = t a + (p d ja ). the ja numbers are guidelines for the thermal performance of the device/pc-board system. all of the above assume no ambient airflow. cathode anode ref v ref r2 27.5k 0.1% r1 27.5k 0.1% r b v+ v o = 5v note: r b should provide cathode current 1ma
amc d oc . #: amc431_c amc431 november 2002 p recision a djustable s hunt v oltage r egulators copyright ? 2002, add microtech corp. 3 www.addmtek.com recommended operating conditions min max units operating free air temperature range, t a 0 70 c cathode current, i k 1 100 ma cathode voltage, v ka 0 36 v electrical characteristics unless otherwise specified, these specifications apply over the operating ambient temperatures with t a = 25 c. amc431 parameter symbol test conditions min typ max units reference input voltage v ref i k = 10ma, v ka = v ref , note 1 2.475 2.500 2.525 v reference input voltage v ref i k = 10ma, v ka = v ref , note 2 2.462 2.500 2.538 v reference input voltage v ref i k = 10ma, v ka = v ref , note 3 2.487 2.500 2.513 v reference drift i k = 10ma, v ka = v ref , 0c t a 70c 4 17 mv voltage ratio, ref to cathode (note 4) i k = 10ma, v ka = 2.5v to 36v -1.4 -2.7 mv/v i k = 10ma,v ka = v ref 2.3 reference input current i ref i k = 10ma,v ka = v ref , 0c t a 70c 2 4 a minimum operating current i min v ka = v ref 0.4 1 ma off-state cathode current i off v ka = 36v, v ref = 0v 0.1 1 a dynamic impedance |z ka | v ka = v ref , i k = 1ma to 100ma, f 1khz 0.2 0.5 ? note 1: for amc431 only. the output accuracy is 1.0%. note 2: for amc431c only. the output accuracy is 1.5%. note 3: for amc431b only. the output accuracy is 0.5%. v ref note 4: v ka ratio of change in reference input voltage to the change in cathode voltage
amc d oc . #: amc431_c amc431 november 2002 p recision a djustable s hunt v oltage r egulators copyright ? 2002, add microtech corp. 4 www.addmtek.com parameter measurement information figure 1. test circuit for v ka = v ref figure 2. test circuit for v ka > v ref figure 3. test circuit for i off input v ka v re input v ka i off input v ka i ref r1 r2
amc d oc . #: amc431_c amc431 november 2002 p recision a djustable s hunt v oltage r egulators copyright ? 2002, add microtech corp. 5 www.addmtek.com characterization curves 150 800 125 100 600 75 50 400 25 0 200 -25 -50 0 -75 -100 -200 2600 5 2580 2560 4 2540 2520 3 2500 2480 2 2460 2440 1 2420 2400 0 t a ? free-air temperature - c t a ? free-air temperature - c i ref ? reference input current ( a) v ref ? reference input voltage (mv) r1 = 10 k ? ? ? ? r2 = i ka = 10ma -75 -50 -25 0 25 50 75 100 125 -75 -50 -25 0 25 50 75 100 125 reference input voltage vs free-air temperature reference input current vs free-air temperature cathode current vs cathode voltage cathode current vs cathode voltage -1 0 1 2 3 v ka = v ref t a = 25 c -2 -1 0 1 2 3 i ka ? cathode current (ma) i ka ? cathode current ( a) v ka = v ref t a = 25 c v ka ? cathode voltage (v) v ka ? cathode voltage (v) i min i ka = 100ma i ka = 10ma v ka = v ref
amc d oc . #: amc431_c amc431 november 2002 p recision a djustable s hunt v oltage r egulators copyright ? 2002, add microtech corp. 6 www.addmtek.com application information v o = (1 + r1/r2) v ref note: r should provide 1ma cathode current to the amc431 of minimum v batt figure 4 . shunt regulator figure 5 . single ?supply comparator with temperature compensated threshold. v o = (1 + r1/r2) v ref figure 6 . high-current shunt regulator figure 7. crowbar circuit v batt r1 0.1% v ref v on 2v v off v batt gnd v th = 2.5v input v o v batt r2 0.1% v o r* r1 r2 v batt amc431 amc431 amc431 amc431 v batt r1 r2 c v o v o
amc d oc . #: amc431_c amc431 november 2002 p recision a djustable s hunt v oltage r egulators copyright ? 2002, add microtech corp. 7 www.addmtek.com application information (continued) figure 8.precision 5v, 1.5a regulator figure 9. precision constant current sink v o = (1 + r1/r2) v ref min v o = v ref + 5v figure 10. output control of a three-terminal fixed regulator i out = (v ref /r cl ) + i ka r1 = v batt /((i o /h fe ) + i ka ) figure 11. precision current limiter amc431 amc317 8.2k ? 243 ? 0.1% v batt v o = 5v/1.5a 243 ? 0.1% adjust amc431 v batt r s 0.1% i o = v ref /r s amc431 v batt amc78l05 r2 r1 out in common v o v batt amc431 r cl 0.1% i o r1
amc d oc . #: amc431_c amc431 november 2002 p recision a djustable s hunt v oltage r egulators copyright ? 2002, add microtech corp. 8 www.addmtek.com note: for to-92 in taping, refer to to-92 package and taping dimension data for lead dimensions. 3-pin plastic to-92 inches millimeters min typ max min typ max a 0.175 0.180 0.205 4.45 4.57 5.21 b 0.170 0.180 0.210 4.32 4.57 5.33 c 0.125 0.142 0.165 3.18 3.62 4.19 f - 0.015 - - 0.38 - g - 0.050 - - 1.27 - j - 0.150 - - 3.81 - k 0.500 0.580 - 12.70 14.73 - m - 5o - - 5o - n - 5o - - 5o - 3-pin plastic to-92 package and taping dimensions inches millimeters min typ max min typ max c 0.079 - - 2.00 - - p 0.480 0.500 0.520 12.2 12.7 13.2 po 0.488 0.500 0.512 12.4 12.7 13.0 do 0.150 0.157 0.165 3.8 4.0 4.2 p1 0.230 0.250 0.256 5.85 6.35 6.85 fo 0.165 0.197 0.220 4.2 5.0 5.6 w 0.669 0.709 0.748 17.0 18.0 19.0 ho 0.610 0.630 0.649 15.5 16.0 16.5 wo 0.224 0.236 0.248 5.7 6.0 6.3 w1 0.335 0.354 0.374 8.5 9.0 9.5 po c f1 fo do wo w1 p1 p ho w a b k f g n c m
amc d oc . #: amc431_c amc431 november 2002 p recision a djustable s hunt v oltage r egulators copyright ? 2002, add microtech corp. 9 www.addmtek.com 8-pin plastic s.o.i.c. inches millimeters min typ max min typ max a 0.183 - 0.202 4.65 - 5.13 b 0.144 - 0.163 3.66 - 4.14 c 0.068 - 0.074 1.73 - 1.88 d 0.010 - 0.020 0.25 - 0.51 f 0.015 - 0.035 0.38 - 0.89 g 0.050 bsc 1.27 bsc j 0.007 - 0.010 0.19 - 0.25 k 0.005 - 0.010 0.13 - 0.25 l 0.189 - 0.205 4.80 - 5.21 m - - 8o - - 8o p 0.228 - 0.244 5.79 - 6.20 3-pin surface mount sot-89 inches millimeters min typ max min typ max a 0.173 - 0.181 4.39 - 4.59 b 0.090 - 0.102 2.28 - 2.59 c 0.055 - 0.063 1.39 - 1.60 d 0.015 - 0.017 0.38 - 0.43 e 0.084 - 0.090 2.13 - 2.28 f 0.016 - 0.019 0.33 - 0.48 g 0.059 bsc 1.49 bsc h 0.118 bsc 2.99 bsc j 0.018 - 0.022 0.45 - 0.55 k 0.155 - 0.167 3.94 - 4.24 l 0.067 - 0.072 1.70 - 1.82 m 0 - 8 0 - 8 m b a l k n h j f g e d c n 0.035 - 0.047 0.89 - 1.19 seating plan a d f p b k c m l j g seating plane
amc d oc . #: amc431_c amc431 november 2002 p recision a djustable s hunt v oltage r egulators copyright ? 2002, add microtech corp. 10 www.addmtek.com surface mount sot-23 inches millimeters min typ max min typ max a 0.039 0.043 0.051 1.00 1.10 1.30 a1 0.000 - 0.004 0.00 - 0.10 a2 0.028 0.032 0.035 0.70 0.80 0.90 b 0.014 0.016 0.020 0.35 0.40 0.50 c 0.004 0.005 0.010 0.10 0.15 0.25 d 0.106 0.114 0.122 2.70 2.90 3.10 e 0.055 0.063 0.071 1.40 1.60 1.80 e 0.075 typ. 1.90 typ. h 0.102 0.110 0.118 2.60 2.80 3.00 l 0.015 - - 0.37 - - m 1 5 9 1 5 9 e d h e a a1 b a2 c l m
amc d oc . #: amc431_c amc431 november 2002 p recision a djustable s hunt v oltage r egulators copyright ? 2002, add microtech corp. 11 www.addmtek.com important notice add microtech (addm) reserves the right to make changes to its products or to discontinue any integrated circuit product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current. a few applications using integrated circuit products may involve potential risks of death, personal injury, or severe property or environmental damage. addm integrated circuit products are not designed, intended, authorized, or warranted to be suitable for use in life-support applications, devices or systems or other critical applications. use of addm products in such applications is understood to be fully at the risk of the customer. in order to minimize risks associated with the customer?s applications, the customer should provide adequate design and operating safeguards. addm assumes to no liability to customer product design or application support. addm warrants the performance of its products to the specifications applicable at the time of sale. u.s. asia pacific region add microtech inc. 492 altamont drive milpitas, ca 95035 add microtech corp 3f, 132, sec. 4, chung hsiao e. rd., taipei, taiwan t e l : (408) 9410420 t e l : 2-27760166 fa x : (408) 9410864 fa x : 2-27764208

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