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cm431 l ow v oltage a djustable s hunt r egulator 2003/03/24 preliminary rev.1.1 champion microelectronic corporation page 1 general description features initial voltage reference accuracy of 1.0%. sink current capability from 1ma to 100ma typical output dynamic impedance less than 200m ? ; adjustable output voltage from v ref to 36v available in sot-23, sot-89, to-92, & sop-8 low output noise typical equivalent full range temperature coefficient of 30ppm/ o c applications the cm431 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 cm431 offers low output impedance for improved load regulation with a typical output impedance of 200m ? . because of the active output circuitry, the cm431 can 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. voltage reference precision shunt regulator high current shunt regulator pwm down converter with reference voltage monitor pin configuration to-92 front view 1 23 ref anode cathode sot-23-3 top view 1 3 2 sot-23-5 top view 1 5 3 nc anode cathode 2 4 ref nc sot-89 top view 1 23 ref anode cathode sop-8 top view 1 2 3 4 8 7 6 5 cathode nc nc nc ref nc anode nc cm431xcm233 cm431xcm2r3 pin 1 ref cathode pin 2 cathode ref pin 3 anode anode suffix ?x?: grade ?a?, ?b?, ?c?, or ?d?
cm431 l ow v oltage a djustable s hunt r egulator 2003/03/24 preliminary rev.1.1 champion microelectronic corporation page 2 typical application block diagram 5v precision regulator + - ordering information package tolerance 0.5% 0.7% 1.0% t/r quantity sot-23 1 CM431ACM233 cm431dcm233 cm431bcm233 tr=3k sot-23 1 cm431acm2r3 cm431dcm2r3 cm431bcm2r3 tr=3k sot-89 1 cm431acm89 cm431dcm89 cm431bcm89 tr=1k to-92 2 cm431acn cm431dcn cm431bcn ta=2k sop-8 cm431acs cm431dcs cm431bcs notes 1 add suffix tr for tape & reel. 2 add suffix ta for tape ammo. 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
cm431 l ow v oltage a djustable s hunt r egulator 2003/03/24 preliminary rev.1.1 champion microelectronic corporation page 3 absolute maximum ratings 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 150 o c storage temperature range -65 o c to 150 o c lead temperature (soldiering, 10 seconds) 260 o c 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 ( o c/w ) derating factor ( mw/ o c ) t a R 25 o c t a Q 25 o c power rating(mw) t a =70 o c power rating(mw) t a = 85 o c power rating (mw) sop-8 165 6.06 757 485 394 to-92 156 6.41 801 513 417 sot-89 71(note) 14.1 1763 1128 916 sot-23 285 3.5 438 280 228 note : 1. for sot-89 package, thermal resistance-junction to tab ( jt ) = 35 o c/w. t j = t tab + (p d x jt ) 2. ja : thermal resistance-junction to ambient junction temperature calculation: t j = t a + (p d x ja ). the ja numbers are guidelines for the thermal performance of the device/pc-board system. all of the above assume no ambient airflow. recommended operating conditions min max units operating free air temperature range, t a 0 105 o c cathode current, i k 1 100 ma cathode voltage, v ka 0 36 v
cm431 l ow v oltage a djustable s hunt r egulator 2003/03/24 preliminary rev.1.1 champion microelectronic corporation page 4 electrical characteristics unless otherwise specified, these specifications apply over the operating ambient temperatures with t a = 25 c. cm431 parameter symbol test conditions min typ max units i k = 10ma, v ka = v ref ,0.5% 2.482 2.495 2.507 v i k = 10ma, v ka = v ref ,0.7% 2.478 2.495 2.512 v reference input voltage v ref i k = 10ma, v ka = v ref ,1.0% 2.470 2.495 2.520 v reference drift i k = 10ma, v ka = v ref , 0 o c t a 70 o c 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 4 reference input current i ref i k = 10ma,v ka = v ref , 0 o c t a 70 o c 2.3 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 3: these parameters are guaranteed by design v ref note 4: v ka ratio of change in reference input voltage to the change in cathode voltage
cm431 l ow v oltage a djustable s hunt r egulator 2003/03/24 preliminary rev.1.1 champion microelectronic corporation page 5 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 (1 + r1/r2) + i ref x r1 input v ka v re input v ka i off input v ka i ref r1 r2
cm431 l ow v oltage a djustable s hunt r egulator 2003/03/24 preliminary rev.1.1 champion microelectronic corporation page 6 typical characteristics cathode current vs. cathode voltage cathode current vs. cathode voltage ref. input voltage vs. free-air temperature ref. input current vs. free-air temperature
cm431 l ow v oltage a djustable s hunt r egulator 2003/03/24 preliminary rev.1.1 champion microelectronic corporation page 7 application information v o = (1 + r1/r2) v ref note: r should provide 1ma cathode current to the cm431 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 cm431 cm431 cm431 cm431 v batt r1 r2 c v o v o
cm431 l ow v oltage a djustable s hunt r egulator 2003/03/24 preliminary rev.1.1 champion microelectronic corporation page 8 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 cm431 lm317 8.2k ? 243 ? 0.1% v batt v o = 5v/1.5a 243 ? 0.1% adjust cm431 v batt r s 0.1% i o = v ref /r s cm431 v batt 78l05 r2 r1 out in common v o v batt cm431 r cl 0.1% i o r1
cm431 l ow v oltage a djustable s hunt r egulator 2003/03/24 preliminary rev.1.1 champion microelectronic corporation page 9 3-pin plastic to-92 package dimension 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 - a b k f g n c 3-pin plastic to-92 carrier 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 note: for to-92, 2,500 units per ammo
cm431 l ow v oltage a djustable s hunt r egulator 2003/03/24 preliminary rev.1.1 champion microelectronic corporation page 10 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 surface mount sot-23 carrier dimensions millimeters a 4.0 0.1 m 1.5 0.1 b 2.0 0.05 n 1.1 0.1 c 4.0 0.1 d 2.5 0.05 e 1.75 0.1 f 6.0 0.2 f e d n c b a m direction of feed
cm431 l ow v oltage a djustable s hunt r egulator 2003/03/24 preliminary rev.1.1 champion microelectronic corporation page 11 sot-89 package dimension e1 e d1 h e a b l b 1 c d d d1 e e1 e l h 8 b b1 b c 5 1.0 8-pin plastic s.o.i.c. pin 1 id
cm431 l ow v oltage a djustable s hunt r egulator 2003/03/24 preliminary rev.1.1 champion microelectronic corporation page 12 important notice champion microelectronic corporation (cmc) 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. cmc 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 cmc 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. hsinchu headquarter sales & marketing 5f, no. 11, park avenue ii, science-based industrial park, hsinchu city, taiwan 11f, no. 306-3, sec. 1, ta tung rd., hsichih, taipei hsien 221 taiwan, r.o.c. t e l : +886-3-5679979 t e l : +886-2-86921591 fa x : +886-3-5679909 f a x : +886-2-86921596

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