1 RH1084 5a low dropout positive adjustable regulator power dissipation .............................. internally limited input-to-output voltage differential ......................... 25v operating junction temperature range control section ............................. 55 c to 150 c power transistor ............................ 55 c to 200 c storage temperature range ................. 65 c to 150 c lead temperature (soldering, 10 sec).................. 300 c d u escriptio a u g w a w u w a r b s o lu t exi t i s the RH1084 positive adjustable regulator is designed to provide 5a with higher efficiency than currently available devices. all internal circuitry is designed to operate down to 1v input-to-output differential and the dropout voltage is fully specified as a function of load current. dropout is guaranteed at a maximum of 1.5v at maximum output current, decreasing at lower load currents. on-chip trim- ming adjusts the output voltage to 1%. current limit is also trimmed, minimizing the stress on both the regulator and power source circuitry under overload conditions. the RH1084 is pin compatible with older 3-terminal regu- lators. a 10 f output capacitor is required on these new device. however, this is usually included in most regulator designs. the wafer lots are processed to linear technology corporation? in-house class s flow-to-yield circuits usable in stringent military applications. preco n ditio n i g u u u 100% thermal limit burn-in bur -i circuit u u package i for atio uu w , ltc and lt are registered trademarks of linear technology corporation. RH1084 in out adj 121 1k RH1084 bi 12.5v 12.5v capacitor(s) not shown 2 1 v in case is output adj k package 2-lead to-3 metal can bottom view note: for ordering information contact ltc.
2 RH1084 t j = 25 c sub- sub- parameter conditions notes min typ max group min typ max group units reference voltage i out = 10ma, (v in ?v out ) = 3v 1.238 1.250 1.262 1 v 10ma i out i full load , 5 1.225 1.270 1.225 1.250 1.270 2,3 v 1.5v (v in ?v out ) 25v line regulation i load = 10ma, 1.5v (v in ?v out ) 15v 1,2 0.015 0.2 1 0.035 0.2 2,3 % 15v (v in ?v out ) 25v 0.5 1 0.050 0.5 2,3 % load regulation (v in ?v out ) = 3v, 1,2,5 0.1 0.3 1 0.2 0.4 2,3 % 10ma i out i full load dropout voltage v ref = 1%, i out = i full load 3,5 1.5 1 1.3 1.5 2,3 v current limit (v in ?v out ) = 5v 5.5 1 5.5 6.5 2,3 a (v in ?v out ) = 25v 0.3 1 0.3 0.6 2,3 a minimum load current (v in ?v out ) = 25v 10 1 5.0 10 2,3 ma thermal regulation t a = 25 c, 30ms pulse 0.003 0.015 4 %/w ripple rejection f = 120hz, c adj = 25 f, 5 60 75 4 60 75 5,6 db c out = 25 f tantalum, i out = i full load , (v in ?v out ) = 3v adjust pin current t j = 25 c 55 120 1 120 2,3 a adjust pin current 10ma i out i full load , 5 5 1 0.2 5 2,3 a change 1.5v (v in ?v out ) 25v temperature stability 0.5 % long term stability t a = 125 c, 1000 hrs 4 0.3 % rms output noise t a = 25 c, 10hz f 10khz 0.003 % (% of v out ) thermal resistance control circuitry 4 0.75 c/w power transistor 4 2.3 c/w table 1: electrical characteristics (preirradiation) ?5 c t j 150 c RH1084 v out adj 150 RH1084 bc 12.5v ?2.5v total dose bias circuit
3 RH1084 table 1a: electrical characteristics (postirradiation) t a = 25 c unless otherwise noted. parameter conditions min max min max min max min max min max units reference voltage (note 5) i out = 10ma (v in ?v out ) = 3v 1.234 1.258 1.23 1.257 1.225 1.253 1.22 1.247 1.205 1.241 v 10ma i out i full load 1.210 1.275 1.219 1.275 1.215 1.275 1.210 1.275 1.203 1.275 v 1.5v (v in ?v out ) 15v line regulation (notes 1, 2) i out = 10ma 1.5v (v in ?v out ) 15v 0.2 0.21 0.23 0.25 0.3 % 15v (v in ?v out ) 25v 0.5 0.5 0.5 0.5 0.5 % load regulation (notes 1, 2, 5) (v in ?v out ) = 3v 0.3 0.3 0.3 0.35 0.4 % 10ma i out i full load dropout voltage (note 3) v ref = 1%, i out = fullload 1.5 1.55 1.65 1.8 2.0 v current limit (v in ?v out ) = 5v 5.5 5.5 5.4 5.25 5.0 a (v in ?v out ) = 25v 0.3 0.3 0.3 0.3 0.3 a minimum load current (v in ?v out ) = 25v 10 10 10 10 10 ma adjust pin current 120 120 120 120 120 a adjust pin current change 10ma i out i full load 55 555 a (note 5) 1.5v (v in ?v out ) 15v 10krad(si) 20krad(si) 50krad(si) 100krad(si) 200krad(si) table 2: electrical test require e ts u w pda test notes the pda is specified as 5% based on failures from group a, subgroup 1, tests after cooldown in accordance with method 5004 of mil-std-883 class b. the verified failures of group a, subgroup 1, after burn-in divided by the total number of devices submitted for burn-in in that lot shall be used to determine the percent defective for the lot. linear technology corporation reserves the right to test to tighter limits than those given. mil-std-883 test requirements subgroup final electrical test requirements (method 5004) 1*,2,3,4,5,6 group a test requirements (method 5005) 1,2,3,4,5,6 group c and d end point electrical parameters 1 (method 5005) * pda applies to subgroup 1. see pda test notes. note 1: see thermal regulation specifications for changes in output voltage due to heating effects. line and load regulation are measured at a constant junction temperature by low duty cycle pulse testing. note 2: line and load regulation are guaranteed up to the maximum power dissipation of 45w for RH1084. power dissipation is determined by the input/output differential voltage and the output current. guaranteed maximum power dissipation will not be available over the full input/output voltage range. note 3: dropout voltage is specified over the full output current range of the device. test points and limits are shown on the dropout voltage curve in the lt 1084 data sheet. note 4: guaranteed by design, characterization, or correlation to other tested parameters. note 5: i full load is defined in the current limit curves in the standard data sheet. for compliance with 883 revision c current density specifications, the RH1084 is rated to 3a. information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
4 RH1084 ? linear technology corporation 1996 lt/lt 0705 rev c printed in usa i.d. no. 66-11-1084 typical perfor m a n ce characteristics uw reference voltage minimum load current load regulation total dose ?krads (si) 1 current limit (a) 8.5 8.0 7.5 7.0 6.5 6.0 5.5 5.0 4.5 10 100 1000 RH1084 g03 (v in ?v out ) = 5v total dose ?krads (si) 1 output voltage (v) 1.26 1.25 1.24 1.23 1.22 10 100 1000 RH1084 g01 10ma i out i full load 1.5v (v in ?v out ) 15v ripple rejection total dose ?krads (si) 1 ripple rejection (db) 105 100 95 90 85 80 75 70 65 10 100 1000 RH1084 g02 (v in ?v out ) = 3v i out = i full load current limit current limit total dose ?krads (si) 1 current limit (a) 0.9 0.8 0.7 0.6 0.5 10 100 1000 RH1084 g04 (v in ?v out ) = 25v line regulation total dose ?krads (si) 1 line regulation (%) 0.3 0.2 0.1 0 0.1 10 100 1000 RH1084 g05 1.5v (v in ?v out ) 15v i out = 10ma total dose ?krads (si) 1 minimum load current (ma) 4 3 2 1 0 10 100 1000 RH1084 g09 (v in ?v out ) = 25v adjust pin current total dose ?krads (si) 1 adjust pin current ( a) 80 70 60 50 40 10 100 1000 RH1084 g08 (v in ?v out ) = 3v 10ma i l i full load total dose ?krads (si) 1 dropout voltage (v) 1.8 1.6 1.4 1.2 1.0 10 100 1000 RH1084 g07 i out = 5a total dose ?krads (si) 1 load regulation (%) 0.10 0.05 0 0.05 0.10 10 100 1000 RH1084 g06 (v in ?v out ) = 3v 10ma i out 5a linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com dropout voltage
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