ultra low dropout IRUH33PA13B20 positive adjustable linear regulator +3.3vin at 3.0a www.irf.com 1 the IRUH33PA13B20 is a space qualified, ultra low dropout linear regulator designed specifically for space applications. this product has been characterized to a total ionizing dose of 200krad(si) per mil-std-883, method 1019 at 200krad at high dose and 100krad at 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. 03/22/06 mo-078aa 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 8.5 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 features: total dose to 200krad(si) and low dose capability to 30krad(si) allows use in space applications low noise, higher efficiency ultra low dropout voltage of 0.4v@ 3a out significantly reduces power consumption remote shutdown permits power sequencing to be easily implemented hermetic mo-078aa (to-258aa) pack ensures higher reliability space level screened product summary part number dropout i o v in v out IRUH33PA13B20 0.4v 3.0a 3.3v 1.265v to (v in - 0.4v) pd-97029 www.datasheet.in
2 www.irf.com IRUH33PA13B20 preliminary pre-radiation pre-radiation for 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 2.9 - 6.5 reference voltage v ref 1.252 1.265 1.278 line regulation 2.9 v in 3.8, i o = 50ma v line -0.25 - +0.25 % / v load regulation v in = 3.3v, 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 = 3.3v, overcurrent latchup i latch 3.0 - - a ripple rejection f = 120hz, i o = 50ma 65 - -db shutdown source current v shdn = 5.0v i shdn -200 - a shutdown pin threshold i source = 200 av shdn 1.0 - 1.6 output voltage at shutdown v in = 3.3v, i o = 50ma, v shdn = +5.0v v out (shdn) -0.1 - +0.1 v v 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 2.9 - 6.5 reference voltage v ref 1.225 1.265 1.305 line regulation 2.9 v in 3.8, i o = 50ma v line -0.5 - +0.5 % / v load regulation v in = 3.3v, 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 = 3.3v, overcurrent latchup i latch 3.0 - - a ripple rejection f = 120hz, i o = 50ma 65 - -db shutdown source current v shdn = 5.0v i shdn -200 - a shutdown pin threshold i source = 200 av shdn 1.0 - 1.6 output voltage at shutdown v in = 3.3v, i o = 50ma, v shdn = +5.0v v out (shdn) -0.1 - +0.1 v v www.datasheet.in
www.irf.com 3 IRUH33PA13B20 preliminary 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 2.9v v in 3.8v, i o = 50ma v line -0.5 - +0.5 % / v load regulation v in = 3.3v, 50ma i out 3.0a v load -2.0 - 2.0 % / a current limit v in = 3.3v i max 3.0 - - a ripple rejection f = 120hz, i o = 50ma 40 - -db output voltage at shutdown v in = 3.3v, i o = 50ma, v shdn = +5.0v v out (shdn) -0.1 - +0.1 v www.datasheet.in
4 www.irf.com IRUH33PA13B20 preliminary 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 pre-radiation characteristics fig 1. ripple rejection vs frequency post-radiation testing and characterization is in process radiation performance characteristics test conditions min max unit mil-std-883, method 1019 operating bias applied during exposure vin = 6.8v, vout = 2.5v, io = 10ma single event effects heavy ions (let) sel, set operating bias applied during exposure vin = 2.9v to 7.0v for sel vin = 2.9v to 3.7v for set 1.00e+10 200 total ionizing dose (gamma) neutron fluence mil-std-883, method 1017 84 mev*cm 2 /mg krads (si) 1.00e+12 neutrons/cm 2 www.datasheet.in
www.irf.com 5 IRUH33PA13B20 preliminary 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. in designs 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, IRUH33PA13B20 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 IRUH33PA13B20 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 irhu33pa13b20 vout vin shdn gnd 100uf 16v tantalum 1.0uf x10 ceramicx7r 1000uf 6.3v low esr tantalum vin vout ground r1 adjust resistor www.datasheet.in
6 www.irf.com IRUH33PA13B20 preliminary space level screening requirements fig 3. simplified schematic circuit note: international rectifier currently doesnot 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 www.datasheet.in
www.irf.com 7 IRUH33PA13B20 preliminary case outline and dimensions - mo-078aa notes: 1) all dimensions are in inches part numbering nomenclature pin assi g nment pin # pin description 1 v in 2gnd 3 v out 4 shutdown 5 adjust 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. 03/06 ir u h 33 p a1 3 b 20 p linear regulator module u = ultra low dropout regulator radiation hardening h = rad hardened or tolerant input voltage 33 = 3.3v screening p = unscreened, 25c electrical test ( not for qual) k = space level screening package code b = mo-078aa polarity p = positive output voltage a1 = adjustable 1.26v to 3.2v maximum output current 3 = 3 amp rad level 20 = 200krads www.datasheet.in
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