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this is information on a product in full production. march 2013 docid5558 rev 10 1/14 14 ts431 low voltage adjustable shunt reference datasheet - production data 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 ? automotive grade version available description the ts431 is a low-voltage, three-terminal, programmable shunt voltage reference. the output voltage can be set to any value between v ref (1.24 v) and 6 v using 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 suitable 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 2/14 docid5558 rev 10 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 (1) 1. please refer to section 3: application information for more details. 0.06 to 30 ma t oper operating free air temperature range -40 to +125 c
docid5558 rev 10 3/14 ts431 electrical characteristics 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 t he temperature range limits is guaranteed through correlation and by design. 2. see definition below. ? vref ? vka ---------------- t1 t2 t e m p e r a t u r e vref min. vref max.
electrical characteristics ts431 4/14 docid5558 rev 10 figure 2. reference voltage vs. temperature figure 3. test circuit for v ka = v ref -40-200 20406080100120 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 20406080100120 temperature (c) 0 0.1 0.2 0.3 0.4 rka static impedance (ohms) vka = vref ik = 100a to 15ma
docid5558 rev 10 5/14 ts431 electrical characteristics 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 20 40 60 80 100 120 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 6/14 docid5558 rev 10 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 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 figure 18. equivalent input noise vs. frequency 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
docid5558 rev 10 7/14 ts431 application information 3 application information the ts431 is a general-purpose low-power programmable shunt voltage reference, capable of operating with a cathode current as low as 60 a and up to 30 ma. the main static parameters of the ts431 voltage reference are specified in table 3 . since the ts431 is designed for general-pur pose applications with a broad range of cathode currents, voltages and loads, when designing with the device in applications requiring fast dynamic response (turn-on/off and/or pulsed load conditions) it should be considered that upon application of power, the time required for the v ka voltage to reach its final value within a specified error range de pends on several factors, among which the temperature, cathode current and capacitive load inrush current are the most influential. the dynamic response of the device to fast tu rn-on/off, load and temperature changes is optimized when the cathode current is not in the lower end of the operating range (i k > 500 a).
package information ts431 8/14 docid5558 rev 10 4 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 a nd product status are available at: www.st.com . ecopack ? is an st trademark.
docid5558 rev 10 9/14 ts431 package information 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 .
package information ts431 10/14 docid5558 rev 10 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
docid5558 rev 10 11/14 ts431 package information 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
ordering information ts431 12/14 docid5558 rev 10 5 ordering information table 5. order codes order codes temperature range packages packing marking ts431ilt -40c, + 125c ??????? tape and reel l272 ts431ailt l271 ts431bilt l270 ts431iylt (1) ??????? (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 acco rding to aec q100 and q003 or equivalen t, advanced screening according to aec q001 & q 002 or equivalent.
docid5558 rev 10 13/14 ts431 revision history 6 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 output voltage change from ta ble 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. 15-nov-2012 8 modified note 1 table 5 on page 12 . 17-dec-2012 9 added note 1 table 2 on page 2 and section 3 on page 7 . 12-mar-2013 10 added features automotive grade version available in cover page.
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