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august 2010 doc id 5558 rev 7 1/13 13 ts431 low voltage adjustable shunt reference features low voltage operation: 1.24 to 6 v 2 %, 1 % and 0.5 % voltage precision wide operating range cathode current: 60 a to 30 ma low output impedance: 0.2 typically stable for any capacitive loads esd protection: ? human body model: 2 kv ? machine model: 200 v 100 ppm/c temperature coefficient description the ts431 is a low-volt age, three-terminal, programmable shunt voltage reference. the output voltage can be set to any value between v ref (1.24 v) and 6 v with two external resistors. the ts431 is able to operate at a lower voltage (1.24 v) and lower cathode current than the widely used tl431 and tl1431 shunt voltage reference. when driving an optocoupler, the ts431 is particularly useful for regulating 3.3 v switching power supplies. l sot23-5 (plastic micropackage) z to92 (plastic package) www.st.com
absolute maximum ratings and operating conditions ts431 2/13 doc id 5558 rev 7 1 absolute maximum ratings and operating conditions table 1. absolute maximum ratings symbol parameter value unit v ka cathode to anode voltage 10 v i k continuous cathode current range -20 to +40 ma i ref reference input current range -0.05 to +3 ma p d power dissipation (1) to92 package sot23-5 package 1. t junction = 150 c, t amb = 25 c with r thja = 200 c/w for to92 package and r thja = 250 c/w for sot23-5l package 625 500 mw t stg storage temperature range -65 to +150 c table 2. operating conditions symbol parameter value unit v ka cathode to anode voltage 1.24 to 6 v i k cathode current 0.06 to 30 ma t oper operating free air temperature range -40 to +125 c
ts431 electrical characteristics doc id 5558 rev 7 3/13 2 electrical characteristics 2.1 definition of output voltag e change over temperature range v ref is defined as the difference between the maximum and minimum values obtained over the full temperature range. v ref = v ref max - v ref min figure 1. output voltage change over temperature range table 3. t amb = 25c (unless otherwise specified) symbol parameter test conditions min. typ. max. unit v ref output voltage v ka = v ref @ i k = 100 a ts431 ts431a ts431b 1.215 1.228 1.234 1.240 1.265 1.252 1.246 v v ref output voltage change (1) (2) i k = 100 a, v ka = v ref 0 < t amb < +70c -40 < t amb < +85c -40 < t amb < +105c -40 < t amb < +125c 9 16 18 21 mv ratio of change in reference input voltage to change in cathode to anode voltage i k = 10ma v ka = 6v to v ref 1.8 2.7 mv/v i ref reference input current i k = 10ma 70 160 na i ref reference input current deviation over temperature range i k =10ma, r 1 =10k , r 2 = -40 < t amb < +85c -40 < t amb < +125c 70 90 160 240 na i min minimum cathode current for regulation v ka = v ref 40 60 a i off off-state cathode current v ka = 6v, v ref = 0 0.001 0.1 a r ka static impedance v ka = v ref , i k = 0.1 to 15ma 0.2 0.4 1. limits are 100% production tested at 25c. behavior at the temperature range limits is guaranteed through correlation and by design. 2. see definition below. vref vka ---------------- t1 t2 temperature vref min. vref max.
electrical characteristics ts431 4/13 doc id 5558 rev 7 figure 2. reference voltage vs. temperature figure 3. test circuit for v ka = v ref -40 -20 0 20 40 60 80 100 120 temperature (c) 1.228 1.232 1.236 1.24 1.244 1.248 1.252 reference voltage (v) vka = vref ik = 100 a input vka vref ik output figure 4. cathode voltage vs. cathode current figure 5. cathode voltage vs. cathode current -1 -0.5 0 0.5 1 1.5 vka cathode voltage (v) -15 -10 -5 0 5 10 15 ika cathode current (ma) vka = vref t = 25c 0 102030405060 ika cathode current (a) 0 0.5 1 1.5 vka cathode voltage (v) -40c +25c +85c +125c figure 6. reference input current vs. temperature figure 7. static impedance vs. temperature -40 -20 0 20 40 60 80 100 120 temperature (c) 0 20 40 60 80 100 iref reference current (na) ik = 10ma r1 = 10 k r2 = + -40 -20 0 20 40 60 80 100 120 temperature (c) 0 0.1 0.2 0.3 0.4 rka static impedance (ohms) vka = vref ik = 100a to 15ma
ts431 electrical characteristics doc id 5558 rev 7 5/13 figure 8. off-state current vs. temperature figure 9. test circuit for off-state current measurement -40 -20 0 20 40 60 80 100 120 temperature (c) 0 50 100 150 200 ioff off-state current (na) input vka=6v ioff figure 10. ratio of change in reference input voltage to change in v ka voltage vs. temperature figure 11. test circuit for v ka > v ref -40-20 0 20406080100120 temperature (c) -3 -2 -1 0 ratio of change in reference input voltage (mv/v) ik = 10ma vka = 6v to vref input ik vka = vref . (1+r1/r2) + iref . r1 vka r1 r2 iref vref figure 12. phase and gain vs. frequency figure 13. test circuit for phase and gain measurement 1e+3 1e+4 1e+5 1e+6 frequency (hz) 0 10 20 30 40 50 60 gain (db) -150 -100 -50 0 50 100 150 phase () phase margin # 50 gain phase input vref ik=100a output 10f 10f 6.8k 4.3k
electrical characteristics ts431 6/13 doc id 5558 rev 7 figure 14. pulse response at i k = 100 a figure 15. test circuit for pulse response at i k = 100 a 012345678910 time (s) 0 1 2 3 input and output voltage (v) input voltage output voltage ik=100a output 50 18k pulse generator f=100khz intput figure 16. pulse response at i k = 1ma figure 17. test circuit for pulse response at i k = 1 ma figure 18. equivalent input noise vs. frequency 01234567 time (s) 0 1 2 3 input and output voltage (v) input voltage output voltage ik=1ma output 50 1.8k pulse generator f=100khz intput 0.1 1 10 100 1000 frequency (khz) 0 50 100 150 200 250 equivalent input noise (nv/vhz) vka = vref ik = 100 a t=25c
ts431 package information doc id 5558 rev 7 7/13 3 package information in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark.
package information ts431 8/13 doc id 5558 rev 7 table 4. sot23-5 package mechanical data ref. dimensions millimeters inches min. typ. max. min. typ. max. a 0.90 1.45 0.035 0.057 a1 0.00 0.15 0.00 0.006 a2 0.90 1.30 0.035 0.051 b 0.35 0.50 0.014 0.02 c 0.09 0.20 0.003 0.008 d 2.80 3.00 0.110 0.118 h 2.60 3.00 0.102 0.118 e 1.50 1.75 0.059 0.069 e 0.95 0.037 e1 1.9 0.075 l 0.35 0.55 0.014 0.022 .
ts431 package information doc id 5558 rev 7 9/13 figure 19. to92 (tape ammopack and tape and reel) package data dim. millimeters inches min. typ. max. min. typ. max. al 5.0 0.197 a 5.0 0.197 t 4.0 0.157 d 0.45 0.018 i1 2.5 0.098 p 11.7 12.7 13.7 0.461 0.500 0.539 po 12.4 12.7 13 0.488 0.500 0.512 p2 5.95 6.35 6.75 0.234 0.250 0.266 f1/f2 2.4 2.5 2.8 0.094 0.098 0.110 h -1 0 1 -0.039 0 0.039 p -1 0 1 -0.039 0 0.039 w 17.5 18.0 19.0 0.689 0.709 0.748 w0 5.7 6 6.3 0.224 0.236 0.248 w1 8.5 9 9.75 0.335 0.354 0.384 w2 0.5 0.020 h200.787 h0 15.5 16 16.5 0.610 0.630 0.650 h1 25 0.984 do 3.8 4.0 4.2 0.150 0.157 0.165 l1 11 0.433 a1 p p a t h h1 h l1 d i1 h0 w2 w0 w1 w d0 f1 f2 p2 p0
package information ts431 10/13 doc id 5558 rev 7 figure 20. to92 (bulk) package mechanical data dim. millimeters inches min. typ. max. min. typ. max. l 1.27 0.05 b 3.2 3.7 4.2 0.126 0.1457 0.1654 o1 4.45 5.00 5.2 0.1752 0.1969 0.2047 c 4.58 5.03 5.33 0.1803 0.198 0.2098 k12.7 0.5 o2 0.407 0.5 0.508 0.016 0.0197 0.02 a 0.35 0.0138
ts431 ordering information doc id 5558 rev 7 11/13 4 ordering information table 5. order codes order codes temperature range packages packing marking ts431ilt -40c, + 125c sot23-5 tape and reel l272 ts431ailt l271 ts431bilt l270 ts431iylt (1) sot23-5 (automotive grade level) l274 ts431aiylt (1) l276 TS431BIYLT (1) l273 ts431iz/izt/iz-ap to92 bulk (z), tape and reel (zt) or ammo pack (ap) ts431i ts431aiz/aizt/aiz-ap ts431ai ts431biz/bizt/biz-ap ts431bi 1. qualification and characterization according to aec q100 and q003 or equivalent, advanced screening according to aec q001 & q 002 or equivalent are on-going.
revision history ts431 12/13 doc id 5558 rev 7 5 revision history table 6. document revision history date revision changes 1-sep-2003 1 initial release. 1-oct-2005 2 ppap references inserted in the datasheet. see the order codes table. minor changes to formatting and grammar. 2-jan-2006 3 ts431aiylt ppap reference inserted. see the order codes table. 22-sep-2006 4 included footnote on automotive grade qualification to order codes table. updated package information (changed mils to inches). 25-apr-2007 5 resized graphics on cover page. moved definition of outpu t voltage change from ta b l e 3 footnote to separate section below table. corrected errors in sot23-5 package mechanical data. removed erroneous drawing for to92 tape & reel package. 30-aug-2007 6 updated drawing for to92 bulk package. modified footnote related to automotive grade qualification in table 5: order codes , and re-ordered order codes. 27-aug-2010 7 modified note for package sot23-5 on page 1 .
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