?2000 fairchild semiconductor international www.fairchildsemi.com rev. 5.0 features ? output current in excess of 1. 5a ? output adjustable between 1. 2v and 37v ? internal thermal-overload protection ? internal short-circuit current-limiting ? output transistor sate-area compensation ? to-220 package description this monolithic integrated circuit is an adjustable 3-terminal positive voltage regulator designed to supply more than 1.5a of load current with an output voltage adjustable over a 1.2 to 37v. it employs internal current limiting, thermal shut- down and safe area compensation. to-220 1. adj 2. output 3. input 1 internal block diagram rlimit 3 vin vo 1 voltage reference vad j 2 protection circuitry + - input output LM317 3-terminal posifive adjustable regulator
LM317 2 absolute maximum ratings electrical characteristics (v i - v o = 5v, i o = 0.5a, 0 c t j +125 c , i max = 1.5a, p max = 20w, unless otherwise specified) ? load and line regulation are specified at constant junction temperature. change in v d due to heating effects must be taken into account separately. pulse testing with low duty is used. (p max = 20w) parameter symbol value unit input-output voltage differential v i - v o 40 v lead temperature t lead 230 c power dissipation p d internally limited w operating temperature range t opr 0 ~ +125 c storage temperature range t stg -65 ~+125 c temperature coefficient of output voltage ? vo/ ? t 0.02 %/ c parameter symbol conditions min typ. max. unit line regulation rline t a = +25 c 3v v i - v o 40v - 0.01 0.04 %/v 3v v i - v o 40v - 0.02 0.07 %/v load regulation rload t a = +25 c, 10ma i o i max v o < 5v v o 5v -18 0.4 25 0.5 mv %/v o 10ma i o i max v o < 5v v o 5v -40 0.8 70 1.5 mv %/v o adjustable pin current i adj - - 46 100 a adjustable pin current change ? i adj 3v v i - v o 40v 10ma i o i max p d p max -2.05 a reference voltage v ref 3v v in - v o 40v 10ma i o i max p d p max 1.20 1.25 1.30 v temperature stability st t --0.7-%/v o minimum load current to maintain regulation l (min) v i - v o = 40v - 3.5 12 ma maximum output current i o(max) v i - v o 15v, p d p max v i - v o 40v, p d p max t a =25 c 1.0 2.2 0.3 -a rms noise, % of v out e n t a = +25 c, 10hz f 10khz - 0.003 0.01 %/v o ripple rejection rr v o = 10v, f = 120hz without c adj c adj = 10 f 66 60 75 -db long-term stability, t j = t high st t a = +25 c for end point measurements, 1000hr -0.31% thermal resistance junction to case r jc - -5- c/w
LM317 3 typical perfomance characteristics figure 1. load regulation figure 3. dropout voltage figure 2. adjustment current figure 4. reference voltage tempera ture ( c) output voltage deviation(%) tempera ture ( c) input-output differential(v) tempera ture ( c) adjustment current(ua) tempera ture ( c) reference voltage(v)
LM317 4 typical application figure 5. programmable regulator c i is required when regulator is located an appreciable distance from power supply filter. c o is not needed for stability, however, it does improve transient response. since i adj is controlled to less than 100 a, the error associated with this term is negligible in most applications. v i ka317 ci 0. 1 f vi vo vadj r 2 i adj v o = 1.25v (1+ r 2 / r 1 )+i adj r 2 r 1 i adj co 1 f input output
LM317 5 mechanical dimensions package 4.50 0.20 9.90 0.20 1.52 0.10 0.80 0.10 2.40 0.20 10.00 0.20 1.27 0.10 ?.60 0.10 (8.70) 2.80 0.10 15.90 0.20 10.08 0.30 18.95max. (1.70) (3.70) (3.00) (1.46) (1.00) (45 ) 9.20 0.20 13.08 0.20 1.30 0.10 1.30 +0.10 ?.05 0.50 +0.10 ?.05 2.54typ [2.54 0.20 ] 2.54typ [2.54 0.20 ] to-220
LM317 6 ordering information product number package operating temperature LM317t to-220 0 c to + 125 c
LM317 7
LM317 7/13/00 0.0m 001 stock#dsxxxxxxxx ? 2000 fairchild semiconductor international life support policy fairchild?s products are not authorized for use as critical components in life support devices or systems without the express written approval of the president of fairchild semiconductor international. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. a critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com
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