l387a july 2003 very low drop 5v regulator with reset ? . precise output voltage (5 v 4 %) . very low dropout voltage . output current in excess of 500ma . power-on, power-off information (reset function) . high noise immunity on reset delay capacitor ordering number : l387a pentawatt ? the l387a is a very low drop voltage regulator in a pentawatt ? package specially designed to pro- vide stabilized 5v supplies in consumer and in- dustrial applications. thanks to its very low in- put/output voltage drop this device is very useful in battery powered equipment, reducing con- sumption and prolonging battery life. a reset out- put makes the l387a particularly suitable for mi- croprocessor systems. this output provides a re- set signal when power is applied (after an exter- nal programmable delay) and goes low when description power is removed, inhibiting the microprocessor. an hysteresis on reset delay capacitor raises the immunity to the ground noise. application circuit * min 33 m f and max. esr 3 w over temperature range. absolute maximum ratings symbol parameter value unit v i d.c. input voltage 35 v t j , t stg junction and storage temperature range C55 to 150 c 1/6 obsolete product(s) - obsolete product(s)
pin connection (top views) r t h j-c a s e thermal resistance junction-case max 4 c/w thermal data block diagram l387a 2/6 obsolete product(s) - obsolete product(s)
electrical characteristics (refer to the test circuit, v i = 14.4 v, t j = 25 c, c o = 100 m f; unless otherwise specified) symbol parameter test conditions min. typ. max. unit v o output voltage i o = 5 ma to 500 ma t j = 25 c C 40 t j 125 c 4.80 4.75 5.00 5.00 5.20 5.25 v v v i operating input voltage (*), over full t range (C 40 to 125 c) (see note **) 26 v d v o line regulation v i = 6 v to 26 v i o = 5 ma 5 50 mv d v o load regulation i o = 5 ma to 500 ma 15 60 mv v i C v o dropout voltage v o = v o nom C 100 mv i o = 350 ma i o = 500 ma 0.40 0.60 0.65 0.8 v v i q quiescent current i o = 0 ma i o = 150 ma i o = 350 ma i o = 500 ma 5 20 60 100 15 35 100 160 ma ma ma ma v i = 6.2 v i o = 500 ma 160 180 ma d v o d t temperature output voltage drift C 0.5 mv/ c svr supply voltage rejection i o = 350 ma f = 120 hz c o = 100 m f v i = 12 v 5 v pp 60 i sc output short circuit current 1.2 1.6 a v r reset output voltage i r = 3 ma 1 < v o < 4.70 v i r = 16 ma 1.5 < v o < 4.75 v over full t (C 40 c t j 125 c) 0.5 0.8 v v i r reset output leakage current v o in regulation v r = 5v over full t range 50 m a t d delay time for reset output cd = 100 nf over full t range 25 ms v rt (off) v o @ reset out h to l transition, over full t range 4.75 v o C 0.15 v i c4 charging current (current generator) v 4 = 3 v 10 20 30 m a v rt (on) power on v o threshold v o @ reset out l to h transition , over full t range v rt (off) + 0.05 v v o C 0.04 v v v 4 comparator threshold (pin 4) v 4 @ reset out h to l transition 3.2 3.9 v v 4 @ reset out l to h transition 3.7 4.3 v v h hysteresis voltage over full t range 450 mv (*) for a dc voltage 26 < vi < 37 v the device is not operating. (**) design limits are guaranteed (but not 100 % production tested) over the indicated temperature and supply voltage ranges. these limits are not used to calculate outgoing quality levels. l387a 3/6 obsolete product(s) - obsolete product(s)
figure 1 : dropout voltage vs. output current. figure 2 : quiescent current vs. output current. figure 3 : output voltage vs. temperature. l387a 4/6 obsolete product(s) - obsolete product(s)
weight: 2.00gr pentawatt v dim. mm inch min. typ. max. min. typ. max. a 4.8 0.189 c 1.37 0.054 d 2.4 2.8 0.094 0.110 d1 1.2 1.35 0.047 0.053 e 0.35 0.55 0.014 0.022 e1 0.76 1.19 0.030 0.047 f 0.8 1.05 0.031 0.041 f1 1.0 1.4 0.039 0.055 g 3.2 3.4 3.6 0.126 0.134 0.142 g1 6.6 6.8 7.0 0.260 0.268 0.276 h2 10.4 0.409 h3 10.05 10.4 0.396 0.409 l 17.55 17.85 18.15 0.691 0.703 0.715 l1 15.55 15.75 15.95 0.612 0.620 0.628 l2 21.2 21.4 21.6 0.831 0.843 0.850 l3 22.3 22.5 22.7 0.878 0.886 0.894 l4 1.29 0.051 l5 2.6 3.0 0.102 0.118 l6 15.1 15.8 0.594 0.622 l7 6.0 6.6 0.236 0.260 l9 2.1 2.7 0.008 0.106 l10 4.3 4.8 0.17 0.189 m 4.23 4.5 4.75 0.167 0.178 0.187 m1 3.75 4.0 4.25 0.148 0.157 0.167 v4 40? (typ.) v5 90? (typ.) dia 3.65 3.85 0.144 0.152 l l1 a c l5 d1 l2 l3 e m1 m d h3 dia. l7 l9 l10 l6 f1 h2 f gg1 e1 f e v4 resin between leads h2 v5 v4 pentvme l4 0015981 outline and mechanical data l387a 5/6 obsolete product(s) - obsolete product(s)
information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsib ility for the conse- quences of use of such information nor for any infringement of patents or other rights of third parties which may result from i ts use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specification mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmi- croelectronics products are not authorized for use as critical components in life support devices or systems without express wr itten approval of stmicroelectronics. the st logo is a registered trademark of stmicroelectronics ? 2003 stmicroelectronics C printed in italy C all rights reserved stmicroelectronics group of companies australia - brazil - canada - china - finland - france - germany - hong kong - india - israel - italy - japan - malaysia - malt a - morocco - singapore - spain - sweden - switzerland - united kingdom - united states. http://www.st.com l387a 6/6 obsolete product(s) - obsolete product(s)
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