voute voutd voutc voutb vouta nc gnd2 gnd2 gnd2 fb typical applications 4707 dey road liverpool, n.y. 13088 (315) 701-6751 mil-prf-38534 certified 5910rh 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 adjustable positive linear regulator equivalent schematic typical applications description: the msk 5910rh is a rad hard adjustable linear regulator capable of delivering 5.0 amps of output current. the typical dropout is only 0.11 volts at 1 amp. an external shutdown/reset function is ideal for power supply sequencing. this device also has latching overload protection that requires no external current sense resistor. the msk 5910rh is radiation hardened and specifically designed for many space/satellite applications. the device is packaged in a hermetically sealed 20 pin flatpack that can be lead formed for surface mount applications. pin-out information vina vinb vinc vind vine vbias gnd1 gnd1 latch shutdown total dose tested to 300k rad (method 1019.7 condition a) ultra low dropout for reduced power consumption external shutdown/reset function latching overload protection adjustable output using two external resistors output current limit surface mount package available with lead forming low input voltage for maximum efficiency up to 5a output current available as smd 5962r05220 rad certified by dscc 1 2 3 4 5 6 7 8 9 10 rev. o 12/09 1 20 19 18 17 16 15 14 13 12 11
input voltage range input bias voltage feedback voltage feedback pin current quiescent current bias current line regulation load regulation dropout voltage minimum output current output voltage range output current limit shutdown threshold shutdown hysteresis ripple rejection phase margin gain margin equivalent noise voltage thermal resistance storage temperature range lead temperature range (10 seconds) power dissipation junction temperature absolute maximum ratings 10.0v 10.0v 5a -55c to +125c -40c to +85c bias supply voltage supply voltage output current case operating temperature range msk5910k/h/e rh MSK5910RH -65c to +150c 300c see soa curve 150c 1 2 3 4 5 6 7 8 9 t st t ld p d t c +v bias +v in i out t c unless otherwise specified , v bias =v in =5.0v, r1=1.62k, v shutdown =0v and i out =10ma. i out is subtracted from i q measurement. see typical application 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" suffix) shall be 100% tested to subgroups 1,2,3 and 4. subgroup 5 and 6 testing available upon request. subgroup 1,4 t c =+25c subgroup 2,5 t c =+125c subgroup 3,6 t a =-55c output current limit is tested with a low duty cycle pulse to minimize junction heating and is dependent on the values of v in , v out and case temperature. see typical performance curves. continuous operation at or above absolute maximum ratings may adversely effect the device performance and/or life cycle. pre and post irradiation limits at 25c, up to 100krad tid, are identical unless otherwise specified. reference dscc smd 5962r05220 for electrical specifications for devices purchased as such. notes: group a subgroup 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 1 2,3 1 2,3 - 1 2,3 1 2,3 1 2,3 4 5,6 4,5,6 4,5,6 4,5,6 - 10ma i out 1.0a v bias v in i out = 1.0a r1=187 ? v fb =1.265v 10ma i out 1.0a i in +i bias, v bias =v in =7.5v not including i out v bias =7.5v i out =10ma 2.9v v in 7.5v r1=187 ? 10ma i out 1.0a r1=976 delta fb=1% i out =1.0a 2.9v v in 7.5v r1=187 ? v in =7.5v v in =2.5v v out =1.5v v out 0.2v (off) v out =nominal (on) difference between voltage threshold of v sdi (on) and v sdi (off) f=1khz to 10khz 10ma i out 1.0a 1.0v=v in -v out i out =450ma i out =45oma referred to feedback pin junction to case @ 125c output device typ. - 5.0 1.265 - - - 14 2 0.01 - 0.06 - 0.11 0.14 8 9 - 3.6 - 1.3 1.3 0.02 0.03 - - 80 30 - 7.3 test conditions max. 7.5 7.5 1.305 1.305 1.315 5.0 20 4 0.50 0.50 0.80 0.80 0.40 0.40 10 10 7.0 4.0 - 1.6 1.6 0.2 0.2 - - - - 50 8.4 min. 2.0 2.9 1.225 1.225 1.215 0 - - - - - - - - - - 1.5 3.2 3.0 1.0 1.0 - - 20 20 30 10 - - min. 2.0 2.9 1.202 - - 0 - - - - - - - - - - 1.5 3.2 - 1.0 - - - 20 - 30 10 - - max. 7.5 7.5 1.328 - - 5.0 20 4 0.60 - 1.0 - 0.45 - 10 - 7.0 4.0 - 1.6 - 0.2 - - - - - 50 9.0 typ. - 5.0 1.265 - - - 14 2 0.01 - 0.06 - 0.11 - 8 - - 3.6 - 1.3 - 0.02 - - - 80 30 - 7.3 v v v v v a ma ma %v out %v out %v out %v out v v ma ma v a a v v v v db db degrees db v rms c/w msk5910k/h/e msk5910 parameter electrical specifications 2 rev. o 12/09 units 1 2 2 2 7 2 2 2 2 2 2 9 2 7 8 post radiation 10
application notes vin a,b,c,d,e - these pins provide the input power connection to the msk 5910rh. this is the supply that will be regulated to the output. all five pins must be connected for proper operation. 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 7.5v. vbias should be kept greater than or equal to vin. gnd1 - internally connected to input ground, these pins should be connected externally by the user to the circuit ground and the gnd2 pins. latch - the msk 5910rh 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. the capacitor is charged to approximately 1.6v from a 7.2a (nominal) current source. exceeding the ther- mal limit will charge 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, toggle the shutdown pin high then low or cycle the power to reset the latch. toggling the shutdown pin or cycling the bias power both disable the device during the reset operation (see shutdown pin description). pulling the latch pin low im- mediately enables the device for as long as the latch pin is held low plus the time delay to re-charge the latch capacitor 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 out- put voltage to droop but remain active if excessive current is drawn. shutdown - there are two functions to the shutdown pin. it may be used to disable the output voltage or to reset the latch pin. to activate the shutdown/reset functions the user must apply a voltage greater than 1.3v to the shutdown pin. the output voltage will turn on when the shutdown pin is pulled below the threshold voltage. if the shutdown pin is not used, it should be connected to ground. fb - the fb pin is the inverting input of the internal error amplifier. the non-inverting input is connected to an internal 1.265v refer- ence. this error amplifier controls the drive to the output transis tor to force the fb pin to 1.265v. an external resistor divider is con- nected to the output, fb pin and ground to set the output voltage. gnd2 - internally connected to output ground, these pins should be connected externally by the user to the circuit ground and the gnd1 pins. vout a,b,c,d,e - these are the output pins for the device. all five pins must be connected for proper operation. typically, large bulk capacitance is required at the output of a linear regulator to maintain good load transient response. how- ever, with the msk 5910rh this is not the case. a 47f surface mount tantalum capacitor in parallel with a 0.1f ceramic capaci- tor from the output to ground should suffice under most condi- tions. 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 typical gain and phase curves. as previously mentioned, the latch pin provides over cur- rent/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 charging current curve). for instance, at 25c, the latch charging current is 7.2a at vbias=3v and 8a at vbias=7v. in the latch-off mode, some additional current will be drawn from the bias supply. this additional latching current is also a function of bias voltage and temperature (see typical performance curves). the msk 5910rh current limit function is directly affected by the input and output voltages. custom current limit is available; contact the factory for more information. 3 rev. o 12/09 power supply bypassing to maximize transient response and minimize power supply tran- sients it is recommended that a 33f minimum tantalum capacitor is connected between vin and ground. a 0.1f ce ramic capacitor should also be used for high frequency bypassing. start up options the msk 5910rh starts up and begins regulating immediately when vbias and vin are applied simultaneously. applying vbias before vin starts the msk 5910rh up in a disabled or latched state. when starting in a latched state the device output can be enabled either by pulling the latch pin low to drain the latch ca- pacitor or pulsing the shutdown pin high. the shutdown pulse duration is partially dependent upon the size of the latch capacitor and should be characterized for each application; 30us is typically adequate for a 1uf latch capacitor at 25c. a momentary high pulse on the shutdown pin can be achieved using the rc circuit below if vin rises rapidly. the resistor and capacitor must be selected based on the required pulse duration, the rise character- istic of vin and the shutdown pin threshold (see shutdown pin threshold and current curves). the shutdown pin can be held high and pulled low after vin comes up or the latch pin held low and released after vin comes up to ensure automatic startup when applying vbias before vin. ei- ther of the basic circuits below can be adapted to a variety of applications for automatic start up when vbias rises before vin. pin functions output capacitor selection overcurrent latch-off/latch pin capacitor selection
application notes cont. 4 rev. o 12/09 heat sink selection to select a heat sink for the msk 5910rh, 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 5910rh is connected for v in =+5v and v out =+3.3v. i out is a continuous 1a dc level. the ambient temperature is +25c. the maximum desired junction temperature is +125c. r jc =8.5c/w and r cs =0.15c/w for most thermal greases power dissipation=(5v-3.3v) x (1a) =1.7watts solve for r sa: 125c - 25c 1.7w = 50.3c/w in this example, a heat sink with a thermal resistance of no more than 50c/w must be used to maintain a junction temperature of no more than 125c. v out =1.265(1+r1/r2) output voltage selection as noted in the above typical applications circuit, the formula for output voltage selection is a good starting point for this output voltage selection is to set r2=1k. by rearranging the formula it is simple to calculate the final r1 value. table 1 below lists some of the most probable resistor combinations based on industry standard usage. r1 r2 1+ v out =1.265 v out 1.265 -1 r1=r2 r sa = -8.4c/w - 0.15c/w typical applications circuit thermal limiting the msk 5910rh 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 5910rh. see latch pin description for instructions to reset the latch or disable the latch fea- ture. 1.5 1.8 2.0 2.5 2.8 3.3 4.0 5.0 1k 1k 1k 1k 1k 1k 1k 1k 187 422 576 976 1.21k 1.62k 2.15k 2.94k output voltage (v) table 1 r2 ( ? ? ? ? ? ) r1 (nearest 1%) ( ? ? ? ? ? ) radiation performance curves for tid testing have been generated for all radiation testing performed by ms kennedy. these curves show performance trends throughout the tid test process and can be located in the msk 5910rh radiation test report. the complete radiation test report is available in the rad hard prod- ucts section on the msk website. total dose radiation test performance http://www.mskennedy.com/store.asp?pid=9951&catid=19680
typical performance curves rev. o 12/09 5
rev. o 12/09 6 typical performance curves 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.
industrial extended reliability 7 rev. o 12/09 note: all dimensions are 0.010 inches unless otherwise labeled. esd triangle indicates pin 1. ordering information MSK5910RH msk5910erh msk5910hrh screening level mil-prf-38534 class h mil-prf-38534 class k msk5910krh weight=3.5 grams typical mechanical specifications leads straight part number dscc smd 5962r05220
all dimensions are 0.010 inches unless otherwise labeled. esd triangle indicates pin 1. rev. o 12/09 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. m.s. kennedy corp. 4707 dey road, liverpool, new york 13088 phone (315) 701-6751 fax (315) 701-6752 www.mskennedy.com ordering information 9 weight=3.3 grams typical mechanical specifications continued industrial extended reliability MSK5910RHg msk5910erhg msk5910hrhg screening level mil-prf-38534 class h mil-prf-38534 class k msk5910krhg leads gull wing part number dscc smd 5962r05220
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