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general description the lr 1084 is a series of low dropout positive voltage regulators with a maximum dropout of 1.5v at 5a of load current. the series features on-chip thermal limiting which pro- vides protection against any combination of overload and ambient temperatures that would create excessive junction temperatures. it also includes a trimmed band- gap reference and a current limiting circuit. the lr 1084 is available in 1.5v, 1.8v, 2.5v, 2.85v, 3.3v and 5.0vversions. the fixed versions integrate the adjust resistors. it is also available in an adjustable version which can set the output voltage with two external resistors. the lr 1084 series is available in standard packages of to-263-2l, to-263-3l, to-220 and to-252. features g low dropout voltage: 1.3v typically at 5a g current limiting and thermal protection g output current: 5a g current limit: 6.5a g operating junction temperature range: 0 to 125 o c g line regulation: 0.015% (typical) g load regulation: 0.2% (typical) applications g high efficiency linear regulators g battery chargers g post regulation for switching supply g microprocessor supply g desktop pcs, risc and embedded processors' supply to-252 to-220 to-263-3l to-263-2l leshan radio company, ltd. 1/1 1 figure 1. package types of lr 1084 LR1084
figure 2. pin configuration of lr 1084 (top view) pin configuration t package (to-220) s package (to-263-3l) input output adj/gnd 1 2 3 1 2 3 adj/gnd output d package (to-252) 1 2 3 adj/gnd output input input s package (to-263-2l) adj/gnd input 1 2 3 output (tab) leshan radio company, ltd. 2/1 1 LR1084
note 1: stresses greater than those listed under "absolute maximum ratings" may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under"recommended operating conditions" is not implied. exposure to "absolute maximum ratings" for extended periods may affect device reliability. recommended operating conditions parameter symbol min max unit operating junction temperature range t j 150 o c storage temperature range t s -65 150 o c lead temperature (soldering, 10 sec.) t lead 300 o c esd (human body model) esd 2000 v parameter symbol min max unit input voltage v in 12 v operating junction temperature range t j 0 125 o c absolute maximum ratings (note 1) leshan radio company, ltd. LR1084 3/1 1
electrical characteristics typicals and limits appearing in normal type apply for t j =25 o c . limits appearing in boldface type apply over parameter symbol conditions min typ max unit reference voltage v ref lr 1084-adj, i out = 10ma, v in -v out = 3v, 10ma d i out d 5a, 1.5v d v in - v out d 5v 1.238 1.225 1.250 1.250 1.262 1.270 v output voltage v out v lr 1084-2.5, i out = 0ma, v in = 5.5v, 10ma d i out d 5a, 4.1v d v in d 7v 2.475 2.45 2.5 2.5 2.525 2.55 lr 1084-2.85, i out = 0ma, v in = 6v, 10ma d i out d 5a, 4.5v d v in d 8v 2.822 2.793 2.85 2.85 2.879 2.907 lr 1084-3.3, i out = 0ma, v in = 6.3v, 10ma d i out d 5a, 4.9v d v in d 8v 3.267 3.234 3.3 3.3 3.333 3.366 lr 1084-5.0, i out = 0ma, v in = 8v, 10ma d i out d 5a, 6.6v d v in d 10v 4.95 4.9 5 5 5.05 5.1 line regulation ' v out lr 1084-adj, i out = 10ma, 2.85v d v in d 10v 0.015 0.035 0.2 0.2 % lr 1084-1.5, i out = 10ma, 3.1v d v in d 10v 0.5 1 6 6 mv lr 1084-1.8, i out = 10ma, 3.4v d v in d 10v 0.5 1 6 6 mv lr 1084-2.5, i out = 10ma, 4.1v d v in d 10v 0.5 1 6 6 mv lr 1084-2.85, i out = 10ma, 4.5v d v in d 10v 0.5 1 6 6 mv lr 1084-3.3, i out = 10ma, 4.9v d v in d 10v 0.5 1 6 6 mv lr 1084-5.0, i out = 10ma, 6.6v d v in d 10v 0.5 1 10 10 mv the entire operating junvtion temperature range. i out = 0ma, v in = 4.5v, 10ma d i out d 5a, 3.1v d v in d 6v 1.485 1.47 1.5 1.5 1.515 1.53 lr 1084-1.8, i out = 0ma, v in = 4.8v, 10ma d i out d 5a, 3.4v d v in d 6v 1.782 1.764 1.8 1.8 1.818 1.836 lr 1084-1. 5 , leshan radio company, ltd. LR1084 4/1 1
electrical characteristics (continued) parameter symbol conditions min typ max unit load regulation ' v out lr d i out d 5a, v in - v out = 3v 0.1 0.2 0.3 0.4 % lr 5 d i out d 5a, v in - v out = 3v 3 7 15 20 mv lr d i out d 5a, v in - v out = 3v 3 7 15 20 mv lr 5 d i out d 5a, v in - v out = 3v 3 7 15 20 mv lr 5 d i out d 5a, v in - v out = 3v 3 7 15 20 mv lr d i out d 5a, v in - v out = 3v 3 7 15 20 mv lr 5 d i out d 5a, v in - v out = 3v 5 10 20 35 mv dropout voltage i o = 5a, ' v ref , ' v out = 1% 1.3 1.5 v current limit i limit v in - v out = 3v, 5.5 6.5 a minimum load current v in = 10v ( lr 1084-adj) 3 10 ma quiescent current v in = 10v ( lr 1084) 510 ma ripple rejection f ripple = 120hz, c out = 25 p f tantalum, i out = 5a, v in - v out = 3v 60 72 db adjust pin current v in = 4.25v, i out = 10ma 55 120 p a adjust pin current change 10ma d i out d 5a, 1.5v d (v in -v out ) d 4.5v 0.2 5 p a temperature stability i out = 10ma, v in - v out = 1.5 0.5 % long term stability t a = 125 o c, 1000hrs 0.5 % rms noise (% of v out ) 10hz d f d 10khz 0.003 % thermal resistance junction -to-case q jc to-263 to-220 to-252 3 3 0 c / w typicals and limits appearing in normal type apply for t j = 25 o c . limits appearing in boldface type apply over the entire operating junvtion temperature range. leshan radio company, ltd. LR1084 5/1 1
typical performance characteristics figure 3 . dropout voltage vs. output current figure 4 . output voltage vs. temperature 0.00.51.01.52.02.53.03.54.04.55.0 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 1.25 1.30 1.35 1.40 1.45 1.50 dropout voltage(v) output current(a) 0255075100125 -1.0 -0.8 -0.6 -0.4 -0.2 0.0 line regulation(mv) t j ( o c) 0255075100125 2.47 2.48 2.49 2.50 2.51 2.52 2.53 output voltage(v) t j ( o c) figure 5 . line regulation vs. temperature 012345 20 25 30 35 40 45 50 55 60 65 70 75 80 adjust pin current vs. output current iadj(ua) io(a) figure 6 . adjust pin current vs. output current leshan radio company, ltd. LR1084 6/1 1
figure 7 . dropout voltage vs. temperature figure 8 . short circuit current vs. dropout voltage typical performance characteristics (continued) 0 25 50 75 100 125 1.20 1.25 1.30 1.35 1.40 dropout voltage(v) t j ( o c) 024681012 0 1 2 3 4 5 6 7 8 short circuit current vs dropout voltage short circuit current(a) dropout voltage(v) figure 9 . load transient response figure 1 0 . line transient response leshan radio company, ltd. LR1084 7/1 1
typical applications leshan radio company, ltd. in LR1084-xx out 3 1 2 22uf 10uf v out v in fig 11. fixed output regulator in LR1084-adj out adj 3 1 2 22uf 10uf v out =1.25v v in r1 120 22uf in LR1084-adj out adj 3 1 2 10uf v out v in r2 r1 120 v ref 22uf 10uf in LR1084-adj out adj 3 1 2 10uf v out v in r2 r1 120 v ref fig 12 . adjustable output 1.25 voltage application circuit fig 13 . adjustable output voltage application circuit fig 14 . adjustable output voltage application with improved ripple rejection adjustable output voltage v out =v ref *(1+r2/r1)+i adj *r2 or v out =v ref (1+r2/r1) , v ref =1.25v LR1084 8/1 1
mechanical dimensions to-263 e e e f f e f f f f e e efe f f e to-263-3l unit: mm leshan radio company, ltd. LR1084 9/1 1
mechanical dimensions (continued) unit: mm to-263-2l f e f f f f f e f e efe e e f e e leshan radio company, ltd. LR1084 10/1 1
?f f f f f e e f e f f f e f e f mechanical dimensions (continued) unit: mm leshan radio company, ltd. 1 1 /1 1 to-220 LR1084

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