ultra low dropout IRUH50PA23A1M positive adjustable linear regulator +5.0vin at 3.0a www.irf.com 1 features: total dose to 1.0mrad(si) and low dose capability to 500 krad(si) allows use in space applications single event latchup immune let = 84 mev/(mg/cm 2 ) fluency = 1 x 10 9 ions/cm 2 low noise, higher efficiency ultra low dropout voltage of 0.4v@ 3a outsignificantly reduces power consumption remote shutdown permits powersequencing to be easily implemented hermetic 8-lead flat pack ensures higher reliability space level screened this part is also available in mo-078 package as iruh50pa23b1m the IRUH50PA23A1M is a space qualified, ultra lowdropout linear regulator designed specifically for space applications. this product has been characterized to a totalionizing dose of 1.0mrad(si) per mil-std-883, method 1019 at both high and low dose rates under biased and unbiased conditions to account for eldrs effects in bipolar devices. the ultra low dropout voltage of 0.4v @ 3a makes the part particularly useful for applications requiring low noise and higher efficiency. 01/09/06 absolute maximum ratings parameter s y mbol value units output current i o 3.5 a input voltage v in 7.0 output voltage v out 1.265v to (v in - 0.4v) power dissipation, t c = 25c p tot 19 w thermal resistance, junction to case r thjc 6.5 c/w operating temperature range t j -55 to +125 storage temperature range t s -65 to +150 c lead temperature t l 300 v product summary part number dropout i o v in v out IRUH50PA23A1M 0.4v 3.0a 5.0v 1.265v to (v in - 0.4v) 8-lead flat pack pd-97032a downloaded from: http:///
2 www.irf.com IRUH50PA23A1M pre-radiation pre-radiationfor notes, please refer to page 3 electrical characteristics @t c = 25c (unless otherwise specified) parameter test conditions s y mbol min. t y p. max. units input voltage range - operating i o = 3.0a v in 4.5 - 6.5 reference voltage v ref 1.252 1.265 1.278 line regulation 4.5v v in 5.5v, i o = 50ma v line -0.25 - +0.25 % / v load regulation v in = 5.0v, 50ma i out 3.0a v load -1.0 - 1.0 % / a dropout voltage i o = 3.0a, v out = 2.5v v drop -- 0.4 v current limit v in = 5.0v, overcurrent latchup i latch 3.0 - - a ripple rejection f = 120hz, i o = 50ma 65 - -d b shutdown source current v shdn = 5.0v i shdn -2 0 0 - a shutdown pin threshold v in = 5.0v v shdn 1.0 - 1.6 output voltage at shutdown v in = 5.0v, i o = 50ma, v shdn = +5.0v v out (shdn) -0.1 - +0.1 vv electrical characteristics @t c = -55c to +125c parameter test conditions s y mbol min. t y p. max. units input voltage range - operating i o = 3.0a v in 4.5 - 6.5 reference voltage v ref 1.225 1.265 1.305 line regulation 4.5v v in 5.5v, i o = 50ma v line -0.5 - +0.5 % / v load regulation v in = 5.0v, 50ma i out 3.0a v load -2.0 - 2.0 % / a dropout voltage i o = 3.0a, v out = 2.5v v drop -- 0.4 v current limit v in = 5.0v, overcurrent latchup i latch 3.0 - - a ripple rejection f = 120hz, i o = 50ma 65 - -d b shutdown source current v shdn = 5.0v i shdn -2 0 0 - a shutdown pin threshold v in = 5.0v v shdn 1.0 - 1.6 output voltage at shutdown v in = 5.0v, i o = 50ma, v shdn = +5.0v v out (shdn) -0.1 - +0.1 vv downloaded from: http:///
www.irf.com 3 IRUH50PA23A1M notes for electrical characteristic tables v shutdown ramp from 0.8v to 4.8v, output monitored for a 100mv drop below the nominal specification for v out post-radiation electrical characteristics @t c = 25c (unless otherwise specified) parameter test conditions s y mbol min. t y p. max. units line regulation 4.5v v in 5.5v, i o = 50ma v line -0.5 - +0.5 % / v load regulation v in = 5.0v, 50ma i out 3.0a v load -2.0 - 2.0 % / a current limit v in = 5.0v i max 3.0 - - a ripple rejection f = 120hz, i o = 50ma 40 - -d b output voltage at shutdown v in = 5.0v, i o = 50ma, v shdn = +5.0v v out (shdn) -0.1 - +0.1 v downloaded from: http:///
4 www.irf.com IRUH50PA23A1M pre-radiation characteristics fig 1. ripple rejection vs frequency omr9601 ripple rejection vs. frequency 0 20 40 60 80 100 120 100 1,000 10,000 100,000 1,000,000 frequency (hz) (db) 3a 1.5a .75a .50a radiation performance characteristics test conditions min typ unit mil-std-883, method 1019 operating bias applied during exposure full rated load, vin=5.0v single event effects heavy ions (let) seu, sel, segr, seb operating bias applied during exposure full rated load, vin=5.0v neutron fluence mil-std-883, method 1017 total ionizing dose (gamma) krads (si) 1.00e+09 1.00e+13 84 mev*cm 2 /mg 1,000 neutrons/cm 2 downloaded from: http:///
www.irf.com 5 IRUH50PA23A1M fig 2. typical application circuit v out = v ref x ( 1+ r1/1000 ) recommended input capacitance for a generic application is a 100 f, 16v tantalum capacitor. however, the input capacitance is not critical to the stability of the regulator and is therefore application dependant. indesigns with a clean bus voltage that is situated close to the input of the regulator, only a small ceramic capacitor will be needed to decouple high frequency noise. on the other hand , in designs with a noisy bus, a larger capacitor will be needed. care should be taken to ensure that the input to the regulator is sufficiently free of noise and disturbances. output capacitance like most ultra low dropout voltage regulators, IRUH50PA23A1M requires the use of output capacitors as part of the device frequency compensation. the device requires a minimum of 220 f tantalum to ensure stability.many different types of capacitor are available and have widely varying characteristics. these capacitors differ in capacitor tolerance, equivalent series resistance (esr), equivalent series inductance and capacitance temperature coefficient. the IRUH50PA23A1M frequency compensation optimizes frequency response with low esr capacitors. in general, use capacitors with an esr of less than 50m ? for heavy load applications. high quality bypass capacitors must be also be used to limit the high frequency noise generated by the load.multiple small ceramic capacitors are typically required to limit parasitic inductance (esl) and esr in the capacitors to acceptable levels. the upper limit of the capacitance is governed by the delayed over-current latch function of the regulator. the regulator has a protection circuit that will latch the device off in the event of a short circuit. however, since it is known that the regulator will draw a large in-rush current upon startup, the latch-off is delayed by about 10ms to allow the outout capacitors to charge to a steady state without shutting down. during this period, the regulator will have an output current at its maximum of around 5a typical. therefore, the maximum output capacitance can be as high as 20,000 f without causing device to latch-off during start-up. input capacitance IRUH50PA23A1M vout vin shdn gnd 100uf 16v tantalum 1.0ufx10 ceramicx7r 1000uf 6.3v low esr tantalum vin vout ground r1 adjust resistor downloaded from: http:///
6 www.irf.com IRUH50PA23A1M space level screening requirements fig 3. simplified schematic circuit note: international rectifier doesnot currently have a dscc certified radiation hardness assurance program shutdown vin vout ground drive gnd adjust test/inspection screening level mil-std-883 space method pre seal burn-in optional 1030 nondestructive bond pull 100% 2023 internal visual 100% 2017 temperature cycle 100% 1010 constant acceleration 100% 2001 mechanical shock 100% 2002 pind 100% 2020 pre burn-in-electrical 100% burn-in 100% 1015 final electrical 100% seal 100% 1014 radiographic 100% 2012 external visual 100% 2009 downloaded from: http:///
www.irf.com 7 IRUH50PA23A1M part numbering nomenclature note:1) all dimensions are in inches ir world headquarters: 233 kansas st., el segundo, california 90245, usa tel: (310) 252-7105 ir leominster : 205 crawford st., leominster, massachusetts 01453, usa tel: (978) 534-5776 tac fax: (310) 252-7903 visit us at www.irf.com for sales contact information . data and specifications subject to change without notice. 01/2006 ir u h 50 p a2 3 a 1m p linear regulator module u = ultra low dropout regulator radiation hardening h = rad hardened or tolerant input voltage 50 = 5.0v screening p = unscreened, 25c electrical test ( not for qual) k = space level screening package code a = 8 lead flat pack polarity p = positive output voltage a2 = adjustable 2.5v to 4.6v maximum output current 3 = 3.0 amp rad level 1m = 1m rads case outline and dimensions - 8-lead flat pack pin assignment pin # pin description 1g n d 2g n d 3 shutdown 4a d j u s t 5 v out 6 v out 7 v in 8v i n downloaded from: http:///
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