typical applications 4707 dey road liverpool, n.y. 13088 (315) 701-6751 mil-prf-38534 certified 5922rh series m.s.kennedy corp. features: satellite system power supplies switching power supply post regulators constant voltage/current regulators microprocessor power supplies rad hard ultra low dropout positive linear regulator equivalent schematic typical applications description: the msk 5922rh is a rad hard fixed linear regulator capable of delivering 5.0 amps of output current. typical dropout is only 0.22 volts with a 2.5 amp load. separated power and bias simplifies supply tracking. this device also has latching overload protection. the msk 5922rh is radiation hardened and specifically designed for space/satellite applications. the device is packaged in a hermetically sealed space efficient 5 pin sip that is electrically isolated from the internal circuitry allowing for direct heat sinking. pin-out information vin vbias vout gnd latch total dose tested to 300k rad (method 1019.7 condition a) low dropout for reduced power consumption latching overload protection available in 1.5v,1.9v,2.5v,2.8v,3.3v and 5.0v output voltages alternate output voltages available output current limit available in 3 lead form options: straight, up and down seperate bias/vin pins for improved efficiency initial output tolerance of 0.5% contact msk for mil-prf-38534 qualification status 1 2 3 4 5 rev. g 12/09 1
input voltage range input bias voltage quiescent current bias current output voltage tolerance line regulation load regulation output current limit ripple rejection thermal resistance storage temperature range lead temperature range (10 seconds) power dissipation junction temperature absolute maximum ratings +10v +10v 5a -55c to +125c -40c to +85c bias supply voltage supply voltage output current case operating temperature range msk5922k/h/e rh msk5922rh -65c to +150c 300c see soa curve 150c 1 2 3 4 5 6 7 8 9 10 11 12 t st t ld p d t c +v bias +v in i out t c unless otherwise specified, vin=vout+1v, vbias=5v and iout=10ma. see figure 2 for typical test circuit. guaranteed by design but not tested. typical parameters are representative of actual device performance but are for reference o nly. industrial grade and "e" suffix devices shall be tested to subgroups 1 and 4 unless otherwise requested. military grade devices ("h" and "k" suffix) shall be 100% tested to subgroups 1,2,3 and 4. subgroup 5 and 6 testing available upon request. subgroup 1,4 tc=+25c subgroup 2,5 tc=+125c subgroup 3,6 ta=-55c output current limit is dependent upon the values of vin and vout. see figure 1 and typical performance curves. continuous operation at or above absolute maximum ratings may adversely effect the device performance and/or life cycle. vin shall be as specified or vin min., whichever is greater. with vbias (pin 2) connected to a separate source, vin min is vout+vdropout; see dropout specifications and performance curves. saturation voltage varies with load. see typical performance curves. latch pin=gnd to prevent latch off during testing, see lat ch pin description. pre and post irradiation limits, at +25c, up to 100krad tid, are identical unless otherwise specified. notes: group a subgroup 1,2,3 1,2,3 1,2,3 1,2,3 1 2,3 1 1 2,3 1 2,3 1 2,3 1 2,3 1 2,3 4 5,6 - 10ma i out 1.0a v bias v in i in +i bias , v bias =v in =6.5v, not including i out v bias =6.5v i out =50ma v out +0.4v v in 6.5v 50ma i out 3.0a v in = v out +1v v in =v out +1v overcurrent latch up f=120hz i out = 50ma junction to case @ 125c output device typ. - 5.0 14 2 0.1 - - 0.1 - 0.06 - 0.22 0.26 0.11 0.12 - - - - 2.2 test conditions max. 6.5 6.5 20 4 0.5 2.5 4.0 0.50 2.5 0.80 2.5 0.40 0.40 0.30 0.30 5 5 - - 3.0 min. note 10 2.9 - - - - - - - - - - - - - 3.0 3.0 65 65 - min. note 10 2.9 - - - - - - - - - - - - - 3.0 - 65 - - max. 6.5 6.5 20 4 1.0 - 4.5 0.60 - 1.0 - 0.45 - 0.30 - 5 - - - 3.5 typ. - 5.0 14 2 0.1 - - 0.01 - 0.06 - 0.22 - 0.11 - - - - - 2.2 v v ma ma % % % % % % % v v v v a a db db c/w msk5922k/h/e rh msk5922rh parameter electrical specifications 2 units 1 2 2 7 2 8 part number msk5922-1.5 msk5922-1.9 msk5922-2.5 msk5922-2.8 msk5922-3.3 msk5922-5.0 output voltage +1.5v +1.9v +2.5v +2.8v +3.3v +5.0v 9 9 9 7 11 9 v in =v out +1v i out =1a 12 2 post radiation rev. g 12/09 i out =2.5a delta v out =1% pin 5(latch)=gnd i out =0.5a dropout voltage
application notes pin functions v in - this pin provides the input power connection to the msk 5922rh. this is the supply that will be regulated to the output. input voltage range is v out + v dropout to 6.5v. vbias - this pin provides power to all internal circuitry including bias, start-up, thermal limit and overcurrent latch. vbias voltage range is 2.9v to 6.5v. vbias should be kept greater than or equal to vin. latch - the msk 5922rh latch pin is used for both current limit and thermal limit. a capacitor between the latch pin and ground sets a time out delay in the event of an over current or short circuit condition. in the event of an overcurrent condition, output short circuit or drop- out condition, the pass transistor and drive circuit will saturate and initiate the latch timing circuit.the capacitor is charged to approximately 1.6v from a 7.2a (nominal) current source. exceeding the thermal limit charges the latch capacitor from a larger current source for a near instant shutdown. once the latch capacitor is charged the device latches off until the latch is reset. momentarily pull the latch pin low, or cycle the power to reset the latch. cycling the bias power disables the device during the reset operation. pulling the latch pin low immedi- ately enables the device for as long as the latch pin is held low plus the time delay to re-charge the latch capaci- tor whether or not the fault has been corrected. disable the latch feature by tying the latch pin low. with the latch pin held low the thermal limit feature is disabled and the current limit feature will force the output voltage to droop but remain active if excessive current is drawn. gnd - internally connected to ground, this pin should be connected externally by the user to the circuit ground. v out - this is the output pin for the device. output capacitors are required to maintain regulation and stability. a 220f surface mount low esr tantalum capacitor from the output to ground should suffice under most conditions. ceramic output capacitors should be kept to a minimum (0.1f typical) and placed directly across the load power connections as close to the load as pos- sible. if the user finds that tighter voltage regulation is needed during output transients, more capacitance may be added. if more capacitance is added to the output, the bandwidth may suffer. see the typical gain and phase curves. input power supply bypassing 3 to maximize transient response and minimize power sup- ply transients it is recommended that a 100f tantalum capacitor is connected between v in and ground. a 0.1f ceramic capacitor should also be used for high frequency bypassing. start up options the msk 5922rh starts up and begins regulating imme- diately when vbias and vin are applied simultaneously. applying vbias before vin starts the msk 5922rh up in a disabled or latched state. when starting in a latched state the device output can be enabled by pulling the latch pin low to drain the latch capacitor. hold the latch pin low and release after vin comes up to ensure automatic startup when applying vbias before vin. the basic circuit below can be adapted to a variety of applications for automatic start up when vbias rises before vin. as previously mentioned, the latch pin provides over current/output short circuit protection with a timed latch- off circuit. reference the latch pin description note. the latch off time out is determined with an external capacitor connected from the latch pin to ground. the time-out period is equal to the time it takes to charge this external capacitor from 0v to 1.6v. the latch charging current is provided by an internal current source. this current is a function of bias voltage and temperature (see latch charg- ing current curve). for instance, at 25c, the latch charg- ing current is 7.2a at vbias=3v and 8a at vbias=6.5v. in the latch-off mode, some additional current will be drawn from the bias supply. this additional latching cur- rent is also a function of bias voltage and temperature (see typical performance curves). the msk 5922rh current limit function is directly af- fected by the input and output voltages. custom current limit is available; contact the factory for more informa- tion. overcurrent latch-off/latch pin capacitor selection output capacitor selection rev. g 12/08
application notes cont. 4 to select a heat sink for the msk 5922rh, the follow- ing formula for convective heat flow may be used. governing equation: t j = p d x (r jc + r cs + r sa ) + t a where t j = junction temperature p d = total power dissipation r jc = junction to case thermal resistance r cs = case to heat sink thermal resistance r sa = heat sink to ambient thermal resistance t a = ambient temperature power dissipation=(v in -v out ) x i out next, the user must select a maximum junction tem- perature. the absolute maximum allowable junction tem- perature is 150c. the equation may now be rearranged to solve for the required heat sink to ambient thermal resistance (r sa ). example: an msk 5922-2.5rh is connected for v in =+3.3v and v out =+2.5v. i out is a continuous 3a dc level. the am- bient temperature is +25c. the maximum desired junc- tion temperature is +125c. r jc =3.0c/w and r cs =0.15c/w for most thermal greases power dissipation=(3.3v-2.5v) x (3a) =2.4 watts solve for r sa: 125c - 25c 2.4w = 38.5c/w in this example, a heat sink with a thermal resistance of no more than 38c/w must be used to maintain a junction temperature of no more than 125c. the msk 5922rh control circuitry has a thermal shut- down temperature of approximately 150c. this ther- mal shutdown can be used as a protection feature, but for continuous operation, the junction temperature of the pass transistor must be maintained below 150c. proper heat sink selection is essential to maintain these condi- tions. exceeding the thermal limit activates the latch fea- ture of the msk 5922rh. momentarily pull the latch pin low or cycle the power to reset the latch. typical applications circuit r sa = - 3.0c/w - 0.15c/w figure 2 thermal limiting heat sink selection the msk 5922rh is nearly identical to the msk 5920rh. it is manufactured with the same materials and component lots that are used in and have been tid tested in the msk 5920rh. the msk5920rh tid radiation re- port is used to provide tid characterization data fo the msk 5922rh. radiation performance curves for tid testing have been generated for all radiation testing performed by ms kennedy. these curves show performance trends through- out the tid test process and can be located in the msk 5920rh radiation test report. the complete radiation test report is available in the rad hard products section on the msk website. total dose radiation test performance http://www.mskennedy.com/store.asp?pid=9951&catid=19680 rev. g 12/09
typical performance curves 5 rev. g 12/09
6 typical performance curves rev. g 12/09 gain and phase response the gain and phase response curves are for the msk typical application circuit and are representative of typical device performance, but are for reference only. the performance should be analyzed for each application to insure individual program requirements are met. external factors such as temperature, input and output voltages, capacitors, etc. all can be major contributors. please consult factory for additional details.
mechanical specifications all dimensions are 0.010 inches unless otherwise labeled. esd triangle indicates pin 1. the information contained herein is believed to be accurate at the time of printing. msk reserves the right to make changes to its products or specifications without notice, however, and assumes no liability for the use of its products. please visit our website for the most recent revision of this datasheet. contact msk for mil-prf-38534 class h, class k and appendix g (radiation) status. m.s. kennedy corp. 4707 dey road, liverpool, new york 13088 phone (315) 701-6751 fax (315) 701-6752 www.mskennedy.com ordering information 7 lead configurations s= straight; u= bent up; d= bent down radiation hardened screening blank= industrial; e=extended reliability h=mil-prf-38534 class h; k=mil-prf-38534 class k output voltage 1.5=+1.5v; 1.9=+1.9v; 2.5=+2.5v; 2.8=+2.8v; 3.3=+3.3v; 5.0=+5.0v general part number msk5922-3.3 k rh u the above example is a +3.3v, class k regulator with leads bent up. weight=7.7 grams typical rev. g 12/09
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