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lm2931 series very low drop voltage regulator with inhibit function ? november 2000 block diagram n very low dropout voltage (0.15v typ. at 10ma load) n low quiescent current (typ 2.5ma, at 100ma load) n output current up to 100ma n adjustable (from v out =2.5v only so-8) and fixed (3.3v & 5v) output voltage version n internal current and thermal limit n load dump protection up to 60v n reverse transient protection up to -50v n temperature range: -40 to 125 o c n package available: to-92, dpak, to-220, so-8 (with inhibit control) description the lm2931 series are very low drop regulators. the very low drop voltage and the low quiescent current make them particular suitable for low noise, low power applications and in battery powered systems. in the 8 pin configation (so-8), fully compatible to the older l78l00 family, a shut down logic control function is available. this means that when the device is used as a local regulator is possible to put a part of the board in stand-by decreasing the total power consumption. ideal for automotive application the lm2931 is proteceted from reverse battery installations or 2 battery jumps. during the transient, suchs as a a load dump (60v) when the input voltage can exceed the specified maximum operating input voltage (26v), the regulator will automatically shut down to protect both internal circuit and the load. to-252 (dpak) to-220 so-8 to-92 1/16
absolute maximum ratings symbol parameter value unit v in dc positive input voltage 40 v v in dc reverse input voltage -15 v v in transient input voltage ( t < 100ms) 60 v v in transient reverse input voltage ( t < 100ms) -50 v v inh inhibit input voltage 40 v i out output current internally limited ma t stg storage temperature range -65 to 150 o c t op operating junction temperature range -40 to 125 o c absolute maximum ratings are those value beyond which damage to the device may occur. functional operation under these conditio n is not implied. connection diagram and ordering numbers (top view) to-220 dpak (*) to-92 (*) so-8 (*) output voltage lm2931av33 lm2931bv33 lm2931av50 LM2931BV50 lm2931adt33 lm2931bdt33 lm2931adt50 lm2931bdt50 lm2931az33 lm2931bz33 lm2931az50 lm2931bz50 lm2931ad33 lm2931bd33 lm2931ad50 lm2931bd50 3.3v 3.3v 5v 5v lm2931d 2.5v to 26v (*) available in tape & reel with the suffix "r" for fixed version and "-r" for adjustable version. to-220 dpak so-8 to-92 pin 1 = out pin 2 = gnd pin 3 = in bottom view (*) = n.c. for fixed and adj for adjustable lm2931 series 2/16
application circuit for fixed output (figure 1) application circuit for adjustable output (figure 2) r 1 suggested value = 27k w v o = v ref x r 1 + r 2 r 1 lm2931 series 3/16
electrical characteristics for lm2931a 3.3v (refer to the test circuits, t j = 25 o c, v in = 14 v, c in = 0.1 m f, c o = 100 m f, i o = 10ma, v inh = 0v unless otherwise specified) symbol parameter test conditions min. typ. max. unit v i maximum operating input voltage i o = 10 ma t j = -40 to 125 o c2637 v v o output voltage 3 .175 3.3 3.425 v v o output voltage i o = 100 ma v in = 6 to 26 v t j = -40 to 125 o c 3.135 3.3 3.465 v d v o line regulation v in = 9 to 16 v 2 10 mv d v o line regulation v in = 6 to 26 v 4 33 mv d v o load regulation i o = 5 to 100 ma 10 33 mv v d dropout voltage (note 1, 2) i o = 10 ma 90 250 mv v d dropout voltage (note 1, 2) i o = 100 ma 250 600 mv i d quiescent current on mode: i out = 100ma 2.5 30 ma i d quiescent current off mode: v inh = 2.5 v r load = 330 w 0.3 1 ma i sc short circuit current 100 300 ma svr supply voltage rejection i o = 100 ma v in = 14 2v f = 120 hz t j = -40 to 125 o c 55 78 db v il control input voltage t j = -40 to 125 o c21.2v v ih control input voltage t j = -40 to 125 o c 3.25 2 v i inh inhibit input current v inh = 2.5 v 22 50 m a v in transient input voltage r load = 330 w t < 100ms 60 70 v v in reverse polarity input voltage v o 0.3v r load = 330 w -15 -50 v v in reverse polarity input voltage transient r load = 330 w t < 100ms -50 v en output noise voltage b = 10hz to 100khz 330 m v rms note 1: reference voltage is measured from v out to ajd pin. note 2: v d measured when the output voltage has dropped 100mv from the nominal value obtained at 14v. lm2931 series 4/16
electrical characteristics for lm2931b 3.3v (refer to the test circuits, t j = 25 o c, v in = 14 v, c in = 0.1 m f, c o = 100 m f, i o = 10ma, v inh = 0v unless otherwise specified) symbol parameter test conditions min. typ. max. unit v i maximum operating input voltage i o = 10 ma t j = -40 to 125 o c2637 v v o output voltage 3 .135 3.3 3.465 v v o output voltage i o = 100 ma v in = 6 to 26 v t j = -40 to 125 o c 2.97 3.3 3.63 v d v o line regulation v in = 9 to 16 v 2 10 mv d v o line regulation v in = 6 to 26 v 4 33 mv d v o load regulation i o = 5 to 100 ma 10 33 mv v d dropout voltage (note 1, 2) i o = 10 ma 90 200 mv v d dropout voltage (note 1, 2) i o = 100 ma 250 600 mv i d quiescent current on mode: i out = 100ma 2.5 30 ma i d quiescent current off mode: v inh = 2.5 v r load = 330 w 0.3 1 ma i sc short circuit current 100 300 ma svr supply voltage rejection i o = 100 ma v in = 14 2v f = 120 hz t j = -40 to 125 o c 55 78 db v il control input voltage t j = -40 to 125 o c21.2v v ih control input voltage t j = -40 to 125 o c 3.25 2 v i inh inhibit input current v inh = 2.5 v 22 50 m a v in transient input voltage r load = 330 w t < 100ms 60 70 v v in reverse polarity input voltage v o 0.3v r load = 330 w -15 -50 v v in reverse polarity input voltage transient r load = 330 w t < 100ms -50 v en output noise voltage b = 10hz to 100khz 330 m v rms note 1: reference voltage is measured from v out to ajd pin. note 2: v d measured when the output voltage has dropped 100mv from the nominal value obtained at 14v. lm2931 series 5/16
electrical characteristics for lm2931a 5v (refer to the test circuits, t j = 25 o c, v in = 14 v, c in = 0.1 m f, c o = 100 m f, i o = 10ma, v inh = 0v unless otherwise specified) symbol parameter test conditions min. typ. max. unit v i maximum operating input voltage i o = 10 ma t j = -40 to 125 o c2637 v v o output voltage 4.81 5 5.19 v v o output voltage i o = 100 ma v in = 6 to 26 v t j = -40 to 125 o c 4.75 5 5.25 v d v o line regulation v in = 9 to 16 v 2 10 mv d v o line regulation v in = 6 to 26 v 4 30 mv d v o load regulation i o = 5 to 100 ma 15 50 mv v d dropout voltage (note 1, 2) i o = 10 ma 90 200 mv v d dropout voltage (note 1, 2) i o = 100 ma 250 600 mv i d quiescent current on mode: i out = 100ma 2.5 30 ma i d quiescent current off mode: v inh = 2.5 v r load = 500 w 0.3 1 ma i sc short circuit current 100 300 ma svr supply voltage rejection i o = 100 ma v in = 14 2v f = 120 hz t j = -40 to 125 o c 55 75 db v il control input voltage t j = -40 to 125 o c21.2v v ih control input voltage t j = -40 to 125 o c 3.25 2 v i inh inhibit input current v inh = 2.5 v 22 50 m a v in transient input voltage r load = 500 w t < 100ms 60 70 v v in reverse polarity input voltage v o 0.3v r load = 500 w -15 -50 v v in reverse polarity input voltage transient r load = 500 w t < 100ms -50 v en output noise voltage b = 10hz to 100khz 500 m v rms note 1: reference voltage is measured from v out to ajd pin. note 2: v d measured when the output voltage has dropped 100mv from the nominal value obtained at 14v. lm2931 series 6/16
electrical characteristics for lm2931b 5v (refer to the test circuits, t j = 25 o c, v in = 14 v, c in = 0.1 m f, c o = 100 m f, i o = 10ma, v inh = 0v unless otherwise specified) symbol parameter test conditions min. typ. max. unit v i maximum operating input voltage i o = 10 ma t j = -40 to 125 o c2637 v v o output voltage 4.75 5 5.25 v v o output voltage i o = 100 ma v in = 6 to 26 v t j = -40 to 125 o c 4.5 5 5.5 v d v o line regulation v in = 9 to 16 v 2 10 mv d v o line regulation v in = 6 to 26 v 4 30 mv d v o load regulation i o = 5 to 100 ma 15 50 mv v d dropout voltage (note 1, 2) i o = 10 ma 90 200 mv v d dropout voltage (note 1, 2) i o = 100 ma 250 600 mv i d quiescent current on mode: i out = 100ma 2.5 30 ma i d quiescent current off mode: v inh = 2.5 v r load = 330 w 0.3 1 ma i sc short circuit current 100 300 ma svr supply voltage rejection i o = 100 ma v in = 14 2v f = 120 hz t j = -40 to 125 o c 55 75 db v il control input voltage t j = -40 to 125 o c21.2v v ih control input voltage t j = -40 to 125 o c 3.25 2 v i inh inhibit input current v inh = 2.5 v 22 50 m a v in transient input voltage r load = 500 w t < 100ms 60 70 v v in reverse polarity input voltage v o 0.3v r load = 500 w -15 -50 v v in reverse polarity input voltage transient r load = 500 w t < 100ms -50 v en output noise voltage b = 10hz to 100khz 500 m v rms note 1: reference voltage is measured from v out to ajd pin. note 2: v d measured when the output voltage has dropped 100mv from the nominal value obtained at 14v. lm2931 series 7/16
electrical characteristics for lm2931adj (refer to the test circuits figure 2 with r 1 =27k w and r 2 =40.5k w , t j = 25 o c, v in = 14 v, c in = 0.1 m f, c o = 100 m f, i o = 10ma, v inh = 0v unless otherwise specified) symbol parameter test conditions min. typ. max. unit v i maximum operating input voltage i o = 10 ma t j = -40 to 125 o c2637 v v ref reference voltage(note 1) 1.14 1.2 1.26 v v ref reference voltage(note 1) i o = 100 ma t j = -40 to 125 o c 1.08 1.2 1.32 v d v o line regulation v in = 3.6 to 26 v 0.6 4.5 mv d v o load regulation i o = 5 to 100 ma 9 30 mv v d dropout voltage (note 1, 2) i o = 10 ma 90 200 mv v d dropout voltage (note 1, 2) i o = 100 ma 250 600 mv i d quiescent current on mode: i out = 100ma 2.5 30 ma i d quiescent current off mode: v inh = 2.5 v r load = 300 w 0.3 1 ma i sc short circuit current 100 300 ma svr supply voltage rejection i o = 100 ma v in = 14 2v f = 120 hz t j = -40 to 125 o c 55 80 db v il control input voltage t j = -40 to 125 o c21.2v v ih control input voltage t j = -40 to 125 o c 3.25 2 v i inh inhibit input current v inh = 2.5 v 22 50 m a v in transient input voltage r load = 300 w t < 100ms 60 70 v v in reverse polarity input voltage v o 0.3v r load = 300 w -15 -50 v v in reverse polarity input voltage transient r load = 300 w t < 100ms -50 v en output noise voltage b = 10hz to 100khz 330 m v rms note 1: reference voltage is measured from v out to ajd pin. note 2: v d measured when the output voltage has dropped 100mv from the nominal value obtained at 14v. lm2931 series 8/16
typical characteristics (unless otherwise specified c in =0.1 m f, c o =100 m f) output voltage vs temperature output voltage vs temperature referece voltage vs temperature load regulation vs temperature line regulation vs temperature dropout voltage vs temperature lm2931 series 9/16
dropout voltage vs temperature output voltage vs input voltage quiescent current vs temperature dropout voltage vs output current short circuit current vs drop voltage quiescent current vs input voltage typical characteristics (continued) lm2931 series 10/16
quiescent current vs output current supply voltage rejection vs frequency line transient supply voltage rejection vs temperature supply voltage rejection vs output current load transient typical characteristics (continued) lm2931 series 11/16
dim. mm inch min. typ. max. min. typ. max. a 4.40 4.60 0.173 0.181 c 1.23 1.32 0.048 0.051 d 2.40 2.72 0.094 0.107 d1 1.27 0.050 e 0.49 0.70 0.019 0.027 f 0.61 0.88 0.024 0.034 f1 1.14 1.70 0.044 0.067 f2 1.14 1.70 0.044 0.067 g 4.95 5.15 0.194 0.203 g1 2.4 2.7 0.094 0.106 h2 10.0 10.40 0.393 0.409 l2 16.4 0.645 l4 13.0 14.0 0.511 0.551 l5 2.65 2.95 0.104 0.116 l6 15.25 15.75 0.600 0.620 l7 6.2 6.6 0.244 0.260 l9 3.5 3.93 0.137 0.154 dia. 3.75 3.85 0.147 0.151 l6 a c d e d1 f g l7 l2 dia. f1 l5 l4 h2 l9 f2 g1 to-220 mechanical data p011c lm2931 series 12/16
dim. mm inch min. typ. max. min. typ. max. a 2.2 2.4 0.086 0.094 a1 0.9 1.1 0.035 0.043 a2 0.03 0.23 0.001 0.009 b 0.64 0.9 0.025 0.035 b2 5.2 5.4 0.204 0.212 c 0.45 0.6 0.017 0.023 c2 0.48 0.6 0.019 0.023 d 6 6.2 0.236 0.244 e 6.4 6.6 0.252 0.260 g 4.4 4.6 0.173 0.181 h 9.35 10.1 0.368 0.397 l2 0.8 0.031 l4 0.6 1 0.023 0.039 == d l2 l4 1 3 == b e == b2 g 2 a c2 c h a1 detail "a" a2 detail "a" to-252 (dpak) mechanical data 0068772-b lm2931 series 13/16
dim. mm inch min. typ. max. min. typ. max. a1.750.068 a1 0.1 0.25 0.003 0.009 a2 1.65 0.064 a3 0.65 0.85 0.025 0.033 b 0.35 0.48 0.013 0.018 b1 0.19 0.25 0.007 0.010 c 0.25 0.5 0.010 0.019 c1 45 (typ.) d 4.8 5.0 0.188 0.196 e 5.8 6.2 0.228 0.244 e1.27 0.050 e3 3.81 0.150 f 3.8 4.0 0.14 0.157 l 0.4 1.27 0.015 0.050 m0.60.023 s 8 (max.) 0016023 so-8 mechanical data lm2931 series 14/16
dim. mm inch min. typ. max. min. typ. max. a 4.58 5.33 0.180 0.210 b 4.45 5.2 0.175 0.204 c 3.2 4.2 0.126 0.165 d 12.7 0.500 e1.27 0.050 f 0.4 0.51 0.016 0.020 g 0.35 0.14 to-92 mechanical data lm2931 series 15/16
information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the co nsequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specification mentioned in this pu blication are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectron ics products are not authorized for use as critical components in life support devices or systems without express written approval of stmicr oelectronics. the st logo is a registered trademark of stmicroelectronics ? 2000 stmicroelectronics C printed in italy C all rights reserved stmicroelectronics group of companies australia - brazil - china - finland - france - germany - hong kong - india - italy - japan - malaysia - malta - morocco singapore - spain - sweden - switzerland - united kingdom - u.s.a. http://www.st.com . lm2931 series 16/16

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