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low voltage (1.24v) adjustable precision shunt regulator az431l data sheet apr. 2005 rev. 1. 2 bcd semiconductor manufacturing limited 1 general description the az431l series ics are low voltage three-terminal adjustable regulators with guaranteed thermal stability over a full operation range. these ics feature sharp turn-on characteristics, lo w temperature coefficient and low output impedance, which make them ideal substitutes for zener diodes in applications such as switching power supply, charger, motherboard and other adjustable regulators. the output voltage can be set to any value between 1.24v and 18v with two external resistors. the az431l precision reference is offered in two bandgap tolerance: 0.5% and 1%. these ics are available in 4 packages: to-92, sot- 23-3, sot-23-5, sot-89. features wide programmable precise output voltage from 1.24v to 18v high stability under capacitive load low temperature deviation: 3mv typical low equivalent full-range temperature coeffi- cient: 20ppm/ o c typical low dynamic output resistance: 0.05 ? typical high sink current capacity from 55 a to 100 ma low output noise wide operating range of -40 to 125 o c applications graphic card pc motherboard voltage adapter switching power supply charger sot-23-5 sot-23-3 to-92 figure 1. package types of az431l sot-89
low voltage (1.24v) adjustable precision shunt regulator az431l data sheet apr. 2005 rev. 1. 2 bcd semiconductor manufacturing limited 2 figure 2. pin configuration of az431l (top view) z package (to-92) (sot-23-3) n package r package (sot-89) figure 3. functional block diagram of az431l functional block diagram k package (sot-23-5) anode nc cathode cathode anode ref ref anode cathode ref 3 1 2 1 23 3 2 1 4 5 nc 4 ref v ref cathode anode + - cathode anode ref 1 2 3 pin configuration
low voltage (1.24v) adjustable precision shunt regulator az431l data sheet apr. 2005 rev. 1. 2 bcd semiconductor manufacturing limited 3 ordering information circuit type bandage tolerance b: 1% a: 0.5% e1: lead free blank: tin lead az431l package tempera- ture range voltage tolerance part number marking id packing type tin lead lead free tin lead lead free to-92 -40 to 125 o c 0.50% az431laz az431laz-e1 az431laz az431laz-e1 bulk 0.50% az431laztr az431laztr-e1 az431laz az431laz-e1 ammo 1% az431lbz az431lbz-e1 az431lbz az431lbz-e1 bulk 1% az431lbztr az431lbztr-e1 az431lbz az431lbz-e1 ammo sot-23-3 -40 to 125 o c 0.50% az431lantr az431lantr-e1 n46 ea6 tape & reel 1% az431lbntr az431lbntr-e1 n47 ea7 tape & reel sot-23-5 -40 to 125 o c 0.50% az431laktr az431laktr-e1 k41 e5a tape & reel 1% az431lbktr az431lbktr-e1 k42 e6a tape & reel sot-89 -40 to 125 o c 0.50% az431lartr az431lartr-e1 r41a e41a tape & reel 1% az431lbrtr az431lbrtr-e1 r41b e41b tape & reel package z: to-92 tr: tape and reel or ammo blank: tube or bulk bcd semiconductor's pb-free products, as designated with "e1" suffix in th e part number, are rohs compliant. n: sot-23-3 k: sot-23-5 r: sot-89 -
low voltage (1.24v) adjustable precision shunt regulator az431l data sheet apr. 2005 rev. 1. 2 bcd semiconductor manufacturing limited 4 parameter symbol value unit cathode voltage v ka 20 v cathode current range (continuous) i ka -100 to 100 ma reference input current range i ref 10 ma power dissipation p d z,r package 770 mw n,k package 370 storage temperature range t stg -65 to 150 o c package thermal impedance q ja to-92 130 o c/w sot-23-3 330 sot-23-5 250 sot-89 100 note 1: stresses greater than those listed under "absol ute maximum ratings" may cause permanent damage to the device. these are stress ratings only , and functional oper ation of the device at these or any other conditions beyond those indicated under "recommended operating conditio ns" is not implied. exposure to "absolute maxi- mum ratings" for extended periods may affect device reliability. parameter symbol min max unit cathode voltage v ka v ref 18 v cathode current i ka 0.1 100 ma operating ambient temperature range -40 125 o c recommended operating conditions absolute maximum ratings (note 1)
low voltage (1.24v) adjustable precision shunt regulator az431l data sheet apr. 2005 rev. 1. 2 bcd semiconductor manufacturing limited 5 (typical and limits apply for t j =25 o c unless otherwise noted.) parameter test circuit symbol conditions min typ max unit reference voltage 0.5% 4 v ref v ka =v ref, i ka =10ma 1.234 1.240 1.246 v 1% 1.228 1.240 1.252 deviation of re ference voltage over-temperature 4 ? v ref v ka =v ref i ka =10ma 0 o c to 70 o c 2 10 mv -40 o c to 85 o c 310 ratio of change in v ref to the change in cathode voltage 5 ? v ref ? v ka i ka =10ma, ? v ka :v ref to 16v -0.5 -1.5 mv/v reference input current 5 i ref i ka =10ma, r1=10k ? , r2= 0.15 0.4 a deviation of reference current over full temperature range 5 ? i ref i ka =10ma, r1=10k ? , r2= t a =-40 to 85 o c 0.1 0.4 a minimum cathode current for regulation 4 i ka (min) v ka =v ref 55 80 a off-state cathode current 6 i ka (off) v ref =0, v ka =18v 0.04 0.10 a v ka =6, v ref =0 0.01 0.05 dynamic impedance 4 z ka v ka =v ref , i ka =1 to 100ma f 1.0khz 0.05 0.15 ? electrical characteristics
low voltage (1.24v) adjustable precision shunt regulator az431l data sheet apr. 2005 rev. 1. 2 bcd semiconductor manufacturing limited 6 figure 4. test circuit 4 for v ka =v ref figure 5. test circuit 5 for v ka >v ref figure 6. test circuit 6 for i off i off v in v ka v in v ka i ka r1 r2 v ref v ka =v ref (1+r1/r2)+ i ref . r1 i ref r3 v in v ka r1 i ka v ref electrical characteristics (continued)
low voltage (1.24v) adjustable precision shunt regulator az431l data sheet apr. 2005 rev. 1. 2 bcd semiconductor manufacturing limited 7 figure 7. reference voltage vs. ambient temperature figure 8. reference current vs. ambient temperature figure 9. cathode current vs. cathode voltage figure 10. current vs. cathode voltage -50 -25 0 25 50 75 100 125 150 1.235 1.236 1.237 1.238 1.239 1.240 1.241 1.242 reference voltage (v) ambient temperature ( o c) v ka =v ref i ka =10ma -50-25 0 255075100125 0.12 0.13 0.14 0.15 0.16 0.17 0.18 i ka =10ma r1=10k ? ambient temperature ( o c) reference current ( a) r2 = -1 0 1 -150 -100 -50 0 50 100 150 cathode current (ma) cathode voltage (v) v ka =v ref t a =25 o c -1 0 1 -300 -200 -100 0 100 200 300 400 cathode current ( a) cathode voltage (v) v ka =v ref t a =25 o c typical performance characteristics
low voltage (1.24v) adjustable precision shunt regulator az431l data sheet apr. 2005 rev. 1. 2 bcd semiconductor manufacturing limited 8 figure 11. small signal voltage gain vs. frequency 100 1k 10k 100k 0 10 20 30 40 50 60 500k voltage gain (db) small signal frequency (hz) i ka =10ma t a =25 o c 10uf 4.3k 6.8k i ka output 360 gnd 5v 1k 10k 100k 1m 0.01 0.1 1 10 i ka = 1ma to 100ma impedance ( ? ) frequency (hz) figure 12. dynamic impedance vs. frequency gnd output 50 ? 100 ? i ka typical performance ch aracteristics (continued)
low voltage (1.24v) adjustable precision shunt regulator az431l data sheet apr. 2005 rev. 1. 2 bcd semiconductor manufacturing limited 9 figure 13. pulse response of input and output voltage pulse generator f=100khz r2 50 ? output gnd r1 1.8k ? -40 -20 0 20 40 60 80 100 120 -0.55 -0.50 -0.45 -0.40 -0.35 -0.30 i ka =10ma ? v ka =v ref to 16v. ratio of ? v ref to ? v ka (mv/v) ambient temperature ( o c) figure 14. ratio of delta reference voltage to the ratio of cathode voltage vs. ambient temperature typical performance ch aracteristics (continued) -10123456 0 1 2 3 input input and output voltage (v) time ( s) output
low voltage (1.24v) adjustable precision shunt regulator az431l data sheet apr. 2005 rev. 1. 2 bcd semiconductor manufacturing limited 10 figure 15. shunt regulator figure 16. high current shunt regulator v o =(1+r1/r2) v ref v o =(1+r2/r3) v ref i out = v ref /r2 + i ka v in v out r1 r2 v ref az431l r3 i out v in az431l r2 r1 v in v out r4 r1 r2 v ref r3 az432 v in v out r4 r1 r2 v ref r3 az431l figure17. current source or current limit typical application s
low voltage (1.24v) adjustable precision shunt regulator az431l data sheet apr. 2005 rev. 1. 2 bcd semiconductor manufacturing limited 11 figure 19. pwm converter with reference figure18. precision 5-v 1.5a regulator az1117 v in 8.2k az431l r1 r2 r3 250 250 2.5v/1a pwm controller c1 r1 r2 680 u2 3 4 ps521 c2 2 r3 r4 r5 v out az431l q1 comp vfb typical applicat ion (continued)
low voltage (1.24v) adjustable precision shunt regulator az431l data sheet apr. 2005 rev. 1. 2 bcd semiconductor manufacturing limited 12 mechanical dimensions to-92 unit: mm (inch) 2.440(0.096) 2.640(0.104) 0.380(0.015) 0.550(0.022) 1.600(0.063) max 14.100(0.555) 14.500(0.571) 1.270(0.050) typ 3.300(0.130) 3.700(0.146) 4.300(0.169) 4.700(0.185) 1.100(0.043) 1.400(0.055) 4.400(0.173) 4.700(0.185) 3.430(0.135) min 0.360(0.014) 0.510(0.020) 0.000(0.000) 0.380(0.015)
low voltage (1.24v) adjustable precision shunt regulator az431l data sheet apr. 2005 rev. 1. 2 bcd semiconductor manufacturing limited 13 mechanical dimens ions (continued) sot-23-3 unit: mm(inch) 2.300(0.091) 2.500(0.098) 1.200(0.047) 1.400(0.055) 0.920(0.036) 0.980(0.039) 0.390(0.015) 0.450(0.018) 1.900(0.075)ref 2.800(0.110) 3.000(0.118) 2.0 3.0 0.500(0.020) 0.700(0.028) 1.050(0.041)ref 0.020(0.001) 0.100(0.004) 0.900(0.035) 1.100(0.043) 4 r0.100(0.004) 7.0 7.0 0.550(0.022)ref 0.200(0.008)min 0.100(0.004) gauge plane 0.080(0.003) 0.150(0.006) r0.100(0.004) 0.0 ~ 10.0
low voltage (1.24v) adjustable precision shunt regulator az431l data sheet apr. 2005 rev. 1. 2 bcd semiconductor manufacturing limited 14 unit: mm(inch) 2.800(0.110) 2 . 7 0 0 ( 0 . 1 0 6 ) 4 4 1 . 5 0 0 ( 0 . 0 5 9 ) r0.100(0.004) 0 . 0 1 0 ( 0 . 0 0 0 4 ) 0 . 9 5 0 ( 0 . 0 3 7 ) 0.300(0.012) 0.925(0.036) 0 . 6 5 0 ( 0 . 0 2 6 ) 0.080(0.003) r0.100(0.004) 0.200(0.008) 0 . 3 0 0 ( 0 . 0 1 2 ) 15 5 3.000(0.118) 1 . 7 0 0 ( 0 . 0 6 7 ) 2 . 9 0 0 ( 0 . 1 1 4 ) 0.975(0.038) 0.500(0.020) 15 5 1 . 4 5 0 ( 0 . 0 5 7 ) 0 . 1 5 0 ( 0 . 0 0 6 ) 1 . 0 5 0 ( 0 . 0 4 1 ) r0.200(0.008) 0.300(0.012) 0.220(0.009) 0 . 6 0 0 ( 0 . 0 2 4 ) mechanical dimens ions (continued) sot-23-5
low voltage (1.24v) adjustable precision shunt regulator az431l data sheet apr. 2005 rev. 1. 2 bcd semiconductor manufacturing limited 15 mechanical dimens ions (continued) sot-89 unit: mm(inch) 1.400(0.055)* 1.630(0.064) 4.400(0.173) 0.360(0.014) 0.440(0.017) 3.000(0.118) 0 . 9 0 0 ( 0 . 0 3 5 ) 2 . 3 0 0 ( 0 . 0 9 1 ) 3 . 9 5 0 ( 0 . 1 5 6 ) 1.400(0.055) 0.360(0.014) 1 0 3 1 0 r0.200(0.008) r0.150(0.006) 0 . 0 0 0 ( 0 . 0 0 0 ) 3 1.600(0.063) 0.440(0.017) 0.560(0.022) 2 . 6 0 0 ( 0 . 1 0 2 ) 0.480(0.019) 4.600(0.181) 1.830(0.072) 1 . 2 0 0 ( 0 . 0 4 7 ) 4 . 2 5 0 ( 0 . 1 6 7 ) 0 . 0 7 6 ( 0 . 0 0 3 ) 0.360(0.014) 0.480(0.019)
8f, b zone, 900 yi shan road, shanghai 200233, prc tel: +86-21-6495 9539, fax: +86-21- 6485 9673 bcd semiconductor (tai wan) company limited room 2210, 22nd fl, 333, keelung road, sec. 1, taipei (110), taiwan tel: +886-2-2758 6828, fax: +886-2-2758 689 2 important notice bcd semiconductor manufacturing limited reserves the right to make changes without further notice to any pro- ducts or specifications herein. bcd se miconductor manufacturing limited does not assume any responsibility for use of any its products for any particular purpose, nor does bcd semiconductor manufacturing limited assume any liability arising out of the application or use of any its products or circuits. bcd semiconductor manufacturing limi- ted does not convey any license under its patent rights or other rights nor the rights of others. http://www.bcdsemi.com bcd semiconductor corporation 3170 de la cruz blvd, suite # 105 santa clara, ca 95054-2411, u.s.a tel: +1-408-988 6388, fax: +1-408-988 63 86 shanghai sim-bcd semiconduc tor manufacturing co., ltd. 800 yi shan road, shanghai 200233, prc tel: +86-21-6485-1491, fax : +86-21-5450-0008 advanced analog circuits (shanghai) corporation

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