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1/14 october 2003 n low dropout voltage (450mv typ. at 1a) n very low quiescent current n thermal shutdown n short circuit protection n reverse polarity protection description the l4941 is a three terminal 5v positive regulators available in to-220, to-220fp and d 2 pak packages, making it useful in a wide range of industrial and consumer applications. thanks to its very low input/output voltage drop, these devices are particularly suitable for battery powered equipments, reducing consumption and prolonging battery life. it employs internal current limiting, antisaturation circuit, thermal shut-down andsafeareaprotection. l4941 very low drop 1a regulator block diagram to-220 d 2 pa k to-220fp dpak
l4941 2/14 absolute maximum ratings absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these condition is not implied. thermal data connection diagram (top view) ordering codes (*) available in tape & reel with the suffix "-tr". symbol parameter2 value unit v i forward input voltage 30 v v ir reverse input voltage (r o =100 w ) -15 v i o output current internally limited ma p d power dissipation internally limited mw t stg storage temperature range -40 to +150 c t op operating junction temperature range -40 to +150 c symbol parameter to-220 to-220fp d 2 pak dpak unit r thj-case thermal resistance junction-case 3538c/w r thj-amb thermal resistance junction-ambient 50 60 62.5 100 c/w to-220 to-220fp d 2 pak dpak ordering code package l4941bv to-220 l4941bp to-220fp l4941bd2t d 2 pak l4941bdt (*) dpak
l4941 3/14 test circuits figure 1 : dc parameter figure 2 : load rejection figure 3 : ripple rejection
l4941 4/14 electrical characteristics (refer to test circuit, v i =7v, c i =0.1 m f, c o =22 m f, t j = 25c, unless otherwise specified.) typical characteristics figure 4 : dropout voltage vs output current figure 5 : dropout voltage vs temperature symbol parameter test conditions min. typ. max. unit v o output voltage i o = 5ma to 1a v i = 6 to 14v 4.8 5 5.2 v v i input voltage i o =5ma 16 v d v o line regulation v i =6to16v i o = 5 ma 5 20 mv d v o load regulation i o = 5ma to 1a 8 20 mv i o = 0.5a to 1a 5 15 mv i q quiescent current i o =5ma v i =6v 4 8 ma i o =1a v i =6v 20 40 ma d i q quiescent current change i o =5ma v i = 6 to 14v 3 ma i o =1a v i = 6 to 14v -10 ma v d dropout voltage i o = 0.5a 250 450 mv i o = 1a 450 700 mv d v o / d t output voltage drift 0.6 mv/c svr supply voltage rejection f = 120hz i o =1a 58 68 db i sc short circuit current v i = 14v 1.6 2.0 a v i = 6v 1.8 2.2 z o output impedance f = 1khz i o = 0.5a 30 m w e n output noise voltage b = 100hz to 100khz 30 m v/v o
l4941 5/14 figure 6 : output voltage vs temperature figure 7 : quiescent current vs temperature figure 8 : quiescent current vs input voltage figure 9 : quiescent current vs output current figure 10 : short circuit current vs temperature figure 11 : peak output current vs input/output differential voltage
l4941 6/14 figure 12 : low voltage behavior figure 13 : supply voltage rejection vs frequency figure 14 : supply voltage rejection vs output current figure 15 : load dump characteristics figure 16 : line transient response figure 17 : total power dissipation
l4941 7/14 figure 18 : load transient response figure 19 : distributed supply with on-card l4940 and l4941 low drop regulator
l4941 8/14 figure 20 : distributed supply with on-card l4940 and l4941 low drop regulator advantages otf these application are: on card regulation with short-circuit and thermal protection on each output. vary high total system efficency due to the switching preregulation and very low-drop postregulation
l4941 9/14 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 to-220 mechanical dat a p011c
l4941 10/14 dim. mm. inch min. typ max. min. typ. max. a 4.40 4.60 0.173 0.181 b 2.5 2.7 0.098 0.106 d 2.5 2.75 0.098 0.108 e 0.45 0.70 0.017 0.027 f 0.75 1 0.030 0.039 f1 1.15 1.50 0.045 0.059 f2 1.15 1.50 0.045 0.059 g 4.95 5.2 0.194 0.204 g1 2.4 2.7 0.094 0.106 h 10.0 10.40 0.393 0.409 l2 16 0.630 l3 28.6 30.6 1.126 1.204 l4 9.8 10.6 0.385 0.417 l6 15.9 16.4 0.626 0.645 l7 9 9.3 0.354 0.366 dia. 3 3.2 0.118 0.126 to-220fp mechanical data l2 a b d e h g l6 f l3 g1 123 f2 f1 l7 l4 7012510/g
l4941 11/14 dim. mm. inch min. typ max. min. typ. max. a 4.4 4.6 0.173 0.181 a1 2.49 2.69 0.098 0.106 a2 0.03 0.23 0.001 0.009 b 0.7 0.93 0.027 0.036 b2 1.14 1.7 0.044 0.067 c 0.45 0.6 0.017 0.023 c2 1.23 1.36 0.048 0.053 d 8.95 9.35 0.352 0.368 d1 8 0.315 e 10 10.4 0.393 0.409 e1 8.5 0.335 g 4.88 5.28 0.192 0.208 l 15 15.85 0.590 0.624 l2 1.27 1.4 0.050 0.055 l3 1.4 1.75 0.055 0.068 m 2.4 3.2 0.094 0.126 r 0.4 0.016 v2 0? 8? 0? 8? d 2 pak mec hanical data p011p6g
l4941 12/14 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 dpak mechani cal data 0068772-b
l4941 13/14 dim. mm. inch min. typ max. min. typ. max. a 330 12.992 c 12.8 13.0 13.2 0.504 0.512 0.519 d 20.2 0.795 n 60 2.362 t 14.4 0.567 ao 6.80 6.90 7.00 0.268 0.272 0.2.76 bo 10.40 10.50 10.60 0.409 0.413 0.417 ko 2.55 2.65 2.75 0.100 0.104 0.105 po 3.9 4.0 4.1 0.153 0.157 0.161 p 7.9 8.0 8.1 0.311 0.315 0.319 tape & reel dpak-ppak mechanical data
l4941 14/14 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 all other names are the property of their respective owners ? 2003 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states. http://www.st.com

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