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1/11 n adjustable output voltage : 2.5 to 36v n sink current capability : 1 to 100ma n typical output impedance : 0.2 w n 0.4% and 0.25% precision description the tl1431 is a programmable shunt voltage reference with guaranteed temperature stability over the entire temperature range of operation. the output voltage may be set to any value between 2.5v and 36v with two external resistors. the tl1431 operates with a wide current range from 1 to 100ma with a typical dynamic impedance of 0.2 w . order code z = to92 plastic package - also available in bulk (z), tape & reel (zt) and ammo pack (ap) d = small outline package (so) - also available in tape & reel (dt) pin connections (top view) part number temperature range package zd tl1431c/ac -20c, +70c tl1431i/ai -40c, +105c z to92 (plastic package) d so8 (batwing plastic micropackage) to92 (top view) so8 (top view) cathode anode reference 123 8765 1234 1- cathode 2- anode 3- anode. 4- n.c. 5- n.c. 6- anode 7- anode. 8- reference 2- tl1431 programmable voltage reference march 2002
tl1431 2/11 absolute maximum ratings operating conditions symbol parameter value unit v ka cathode to anode voltage 37 v i k continuous cathode current range -100 to +150 ma i ref reference input current range -0.05 to +10 ma p d power dissipation 1) to92 so8 batwing 1. pd is calculated with t amb = +25c, t j = +150c and r thja = 200c/w for to92 package = 130c/w for so8 batwing package 625 960 mw t stg storage temperature range -65 to +150 c t j junction temperature +150 c symbol parameter value unit v ka cathode to anode voltage v ref to 36 v i k cathode current 1 to 100 ma t amb operating free-air temperature range tl1431c/ac tl1431i/ai -20 to +70 -40 to +105 c
tl1431 3/11 electrical characteristics t amb = 25c (unless otherwise specified) 1) d v ref is defined as the difference between the maximum and minimum values obtained over the full temperature range d v ref = v ref max. - v ref min. 2) the temperature coefficient is defined as the slopes (positive and negative) of the voltage vs temperature limits within whi ch the reference is guaranteed. 3) the dynamic impedance is defined as ? z ka ? = symbol parameter tl1431c tl1431ac unit min. typ. max. min. typ. max. v ref reference input voltage - (figure 1) v ka = v ref , i k = 10 ma 2.490 2.500 2.510 2.493 2.500 2.507 v d v ref reference input voltage deviation overtemperature range - (figure 1, note 1) v ka = v ref , i k = 10 ma,t min t amb t max 3 20 3 20 mv temperature coefficient of reference input voltage (note 2) v ka = v ref , i k = 10 ma,t min t amb t max 13 90 13 90 ppm/c ratio of change in reference input voltage to change in cathode to anode voltage - (figure 2) i k = 10ma, d v ka = 36v to 3v -2 -1.1 -2 -1.1 mv/v i ref reference input current - (figure 2) i k = 10ma, r1 = 10k w , r2 = t min t amb t max 1.5 2.5 3 1.5 2.5 3 m a d i ref reference input current deviation over temperature range -(figure 2) i k = 10ma, r1 = 10k w , r2 = t min t amb t max 0.2 1.2 0.2 1.2 m a i min minimum cathode current for regulation - (figure1) v ka = v ref 0.5 1 0.5 0.6 ma i off off-state cathode current (figure 3) 180 500 180 500 na ? z ka ? dynamic impedance ( note 3 ) v ka = v ref , d i k = 1 to100ma, f 1khz 0.2 0.5 0.2 0.5 w d v re f d t -------------------- - d v re f d v ka -------------------- - t1 t2 temperature v ref max. v ref min. temperature 25c max 2.5v min -n ppm/c +n ppm/c d vka d ik ---------------- -
tl1431 4/11 electrical characteristics t amb = 25c (unless otherwise specified) 1) d v ref is defined as the difference between the maximum and minimum values obtained over the full temperature range d v ref = v ref max. - v ref min. . 2) the temperature coefficient is defined as the slopes (positive and negative) of the voltage vs temperature limits within whi ch the reference is guaranteed. 3) the dynamic impedance is defined as ? z ka ? = symbol parameter tl1431i tl1431ai unit min. typ. max. min. typ. max. v ref reference input voltage -(figure 1) v ka = v ref , i k = 10 ma 2.490 2.500 2.510 2.493 2.500 2.507 v d v ref reference input voltage deviation overtemperature range - ( figure 1, note 1) v ka = v ref , i k = 10 ma,t min t amb t max 730 730mv temperature coefficient of reference input voltage -( note 2) v ka = v ref , i k = 10 ma,t min t amb t max 22 100 22 100 ppm/c ratio of change in reference input voltage to change in cathode to anode voltage - (figure 2) i k = 10ma, d v ka = 36v to 3v -1.1 -2 -1.1 -2 mv/v i ref reference input current - (figure 2) i k = 10ma, r1 = 10k w , r2 = t min t amb t max 1.5 2.5 3 1.5 2.5 3 m a d i ref reference input current deviation over temperature range - (figure 2) i k = 10ma, r1 = 10k w , r2 = t min t amb t max 0.5 1 0.8 1.2 m a i min minimum cathode current for regulation - (figure1) v ka = v ref 0.5 1 0.5 0.7 ma i off off-state cathode current (figure 3) 180 500 180 500 na ? z ka ? dynamic impedance - (note 3) v ka = v ref , d i k = 1 to100ma, f 1khz 0.2 0.5 0.2 0.5 w d v re f d t -------------------- - d v re f d v ka -------------------- - t1 t2 temperature v ref max. v ref min. temperature 25c max 2.5v min -n ppm/c +n ppm/c d vka d ik ---------------- -
tl1431 5/11 figure 1 : test circuit for v ka = v ref figure 3 : test circuit for i off figure 5 : block diagram of tl1431 figure 2 : test circuit for v ka > v ref figure 4 : test circuit for phase margin and voltage gain figure 6 : test circuit for response time input v ka v ref i k =10ma output r v ka =36v i off vref cathode anode + - vref vref cathode anode + - vref v ka = v ref + r1 x i ref 1 r1 r2 ------- - + () input v ka v ref i k r1 r2 i ref r output input v ref i k =10ma output 10 m f 10 m f 15k w 8.25k w i k =1ma output 0 ma 1 ma
tl1431 6/11 reference voltage vs temperature reference voltage vs cathode current off-state cathode current vs temperature reference voltage vs cathode current reference current vs temperature ratio of change in v ref to change in v ka vs temperature -40 -20 0 20 40 60 80 100 120 2.486 2.488 2.490 2.492 2.494 2.496 2.498 2.500 i k =10 ma v ka =v ref =2.5 v see figure 1 reference voltage (v) temperature ( c) 0.0 0.2 0.4 0.6 0.8 1.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 v ka =v ref see figure 1 reference voltage (v) cathode current (ma) -40 -20 0 20 40 60 80 100 120 0.00 0.02 0.04 0.06 0.08 0.10 v ka = 36v see figure 3 i off ( m a) temperature( c) -40 -20 0 20 40 60 80 100 -1 0 1 2 3 v ka =v ref see figure 1 reference voltage (v) cathode current (ma) -40 -20 0 20 40 60 80 100 120 0.0 0.5 1.0 1.5 2.0 i k =10 ma v ka =v ref see figure 1 i ref ( m a) temperature ( c) -40 -20 0 20 40 60 80 100 120 -2.0 -1.5 -1.0 -0.5 0.0 i k =10 ma v ka =v ref see figure 2 d v ref / d v ka (mv / v) temperature ( c)
tl1431 7/11 drift of r ka vs temperature gain & phase vs frequency maximum power dissipation minimum operating current vs temperature stability behaviour with capacitive loads pulse response for i k = 1ma -40 -20 0 20 40 60 80 100 120 -0.04 -0.03 -0.02 -0.01 0.00 i k =10 ma v ka =v ref = 2.5v see figure 1 d r ka ( w ) temperature ( c) 1 10 100 1000 10000 -40 -20 0 20 40 60 -200 -150 -100 -50 0 50 100 150 200 gain (db) frequency (khz) i k =10 ma see figure 4 phase gain phase ( ) 10 20 30 0 20 40 60 80 100 t amb = +25 c safe area so8 batwing to92 cathode current (ma) cathode voltage (v) -40 -20 0 20 40 60 80 100 120 0.40 0.42 0.44 0.46 0.48 0.50 0.52 i k =i min v ka =v ref see figure 1 i min (ma) temperature ( c) 1e-10 1e-9 1e-8 1e-7 1e-6 1e-5 0 20 40 60 80 100 stable area stable area instable area v ka =24v v ka =12v v ka =5v v ka =v ref cathode current (ma) capacitive load (f) 012345 0 2 4 6 t amb =+25 c see figure 6 output voltage current step: 1 ma voltage (v) time ( m s)
tl1431 8/11 package mechanical data 8 pins - batwing plastic micropackage (so) dim. millimeters inches min. typ. max. min. typ. max. a 1.75 0.069 a1 0.1 0.25 0.004 0.010 a2 1.65 0.065 a3 0.65 0.85 0.026 0.033 b 0.35 0.48 0.014 0.019 b1 0.19 0.25 0.007 0.010 c 0.25 0.5 0.010 0.020 c1 45 (typ.) d 4.8 5.0 0.189 0.197 e 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 3.81 0.150 f 3.8 4.0 0.150 0.157 l 0.4 1.27 0.016 0.050 m 0.6 0.024 s 8 (max.) b e3 a a2 s l c e c1 a3 b1 a1 d m 8 5 1 4 f
tl1431 9/11 package mechanical data 3 pins - plastic package to92 (tape & reel) 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 d h -1 0 1 -0.039 0 0.039 d 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 h 20 0.787 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
tl1431 10/11 package mechanical data 3 pins - plastic package to92 (tape ammo pack) 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 d h -1 0 1 -0.039 0 0.039 d 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 h 20 0.787 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
tl1431 11/11 package mechanical data 3 pins - plastic package to92 (bulk) 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 k 12.7 0.5 o2 0.407 0.5 0.508 0.016 0.0197 0.02 a 0.35 0.0138 information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result f rom its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specificati ons mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of stmicroelectronics. ? the st logo is a registered trademark of stmicroelectronics ? 2002 stmicroelectronics - printed in italy - all rights reserved stmicroelectronics group of companies australia - brazil - canada - china - finland - france - germany - hong kong - india - israel - italy - japan - malaysia malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states ? http://www.st.com

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