typical applications 4707 dey road liverpool, n.y. 13088 (315) 701-6751 mil-prf-38534 certified 5920rh 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 5920rh is a rad hard fixed linear regulator capable of delivering 5.0 amps of output current. typical dropout is only 0.30 volts with a 3 amp load. an external shutdown function is ideal for power supply sequencing. this device also has internal latching overload protection. the msk 5920rh is radiation hard and specifically de- signed 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 gnd vout shutdown n/c total dose tested to 300k rad (method 1019.7 condition a) ultra low dropout for reduced power consumption external shutdown function latching overload protection available in 1.5v,1.8v,1.9v,2.5v,2.8v,3.3v and 5.0v output voltages alternate output voltages available output current limit available in 4 lead form options: straight, up, down and gull wing replaces ir omr9601 and iruh33pxxxb/iruh50pxxxb available as smd 5962r05220 rad certified by dscc 1 2 3 4 5 rev. p 1/11 1
storage temperature range lead temperature range (10 seconds) power dissipation junction temperature absolute maximum ratings +10v 5a -55c to +125c -40c to +85c supply voltage output current case operating temperature range msk5920k/h rh msk5920rh -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 in i out t c unless otherwise specified, v in =v out +1v, v shutdown =0v and i out =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 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 t c =+25c subgroup 2,5 t c =+125c subgroup 3,6 t a =-55c output current limit is dependent upon the values of v in and v out . 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. v in shall be as specified or v in min., whichever is greater. not applicable to versions where v in = v in min. 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: electrical specifications 2 8 part number msk5920-1.5 msk5920-1.8 msk5920-1.9 msk5920-2.5 msk5920-2.8 msk5920-3.3 msk5920-5.0 output voltage +1.5v +1.8v +1.9v +2.5v +2.8v +3.3v +5.0v 7 rev. p 1/11 12
application notes pin functions v in - this pin provides power to all internal circuitry in- cluding bias, start-up, thermal limit and overcurrent latch. input voltage range is 2.9v to 6.5v. gnd - internally connected to ground, this pin should be connected externally by the user to the circuit ground. shutdown - there are two functions to the shutdown pin. it may be used to disable the output voltage or to reset a current latch condition. to activate the shutdown/ reset functions the user must apply a voltage greater than 1.6v to the shutdown pin. the output voltage will turn on when the shutdown pin is pulled below the thresh- old voltage. if the shutdown pin is not used, it should be connected to ground. it should be noted that with the shutdown pin tied to ground, a current latch condition can only be reset by cycling power off, then on. v out - this is the output pin for the device. input power supply bypassing 3 figure 1 overcurrent protection is provided by the msk 5920rh series through the use of a timed latch off circuit. the internal latch timeout is triggered by an overcurrent con- dition. to allow for start up surge currents, the timeout is approximately 5.5ms at 25c. if the overcurrent condi- tion remains at the end of the timeout cycle, the regulator will latch off until the latch is reset. reset the latch by pulling the shutdown pin high or cycling v in off then back on. a thermal limit condition will trigger the latch with no time out delay. overcurrent latch to maximize transient response and minimize power sup- ply transients it is recommended that a 100 f tantalum capacitor is connected between v in and ground. a 0.1 f ceramic capacitor should also be used for high frequency bypassing. current limit and soa the msk 5920rh current limit function is directly af- fected by the input and output voltages. figure 1 illus- trates the relationship between v in and i cl for various output voltages. it is very important for the user to con- sult the soa curve when using input voltages which re- sult in current limit conditions beyond 4.5 amps. when using input voltages which result in current limit above 4.5 amps, the user must maintain output current within the soa curve to avoid damage to the device. note that 5 amp maximum is due to current carrying capability of the internal wirebonds. replacing the omr9601/iruh33p253aim when the msk 5920-2.5rh is used as a replacement for the ir omr9601 or iruh33p253b, the user should recognize that the msk 5920-2.5rh does not contain in- ternal tantalum capacitors on the input and output. msk does not typically use tantalum capacitors in space level standard products of this nature. rev. p 1/11 output capacitor selection low esr output capacitors are required to maintain regu- lation and stability. four cwr29fb227 (avx pn tazh227k010l) tantalum capacitors in parallel with ce- ramic decoupling capacitors (0.1 f typical) provides suf- ficient gain and phase margin for most applications. the maximum esr specification for the cwr29fb227 capaci- tor is 180m at 100khz and is sufficient for many appli- cations. msk has found through full wcca that screen- ing for a maximum esr of 57m ensures eol stability criteria to be met for many applications with the most stringent requirements. the typical esr of the tazh227k010l from avx is 49m . analysis of the fi- nal design is recommended to ensure stability require- ments are met.
application notes cont. 4 to select a heat sink for the msk 5920rh, 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 5920-2.5rh 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 =4.0c/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 = 36.5c/w in this example, a heat sink with a thermal resistance of no more than 36.5c/w must be used to maintain a junction temperature of no more than 125c. the msk 5920rh 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 5920rh. toggle the shutdown pin high them low or cycle power to reset the latch. see shut- down pin description and overcurrent latch description for more information. typical applications circuit r sa = -4.0c/w - 0.15c/w figure 2 rev. p 1/11 thermal limiting heat sink selection 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 5920rh 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 5 rev. p 1/11
6 rev. p 1/11 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.
mechanical specifications all dimensions are 0.010 inches unless otherwise labeled. esd triangle indicates pin 1. ordering information 7 lead configurations gw= gull wing radiation hardened screening blank= industrial; h=mil-prf-38534 class h; k=mil-prf-38534 class k output voltage 1.5=+1.5v; 1.8=+1.8v; 1.9=+1.9v; 2.5=+2.5v; 2.8=+2.8v; 3.3=+3.3v; 5.0=+5.0v general part number msk5920-3.3 k rh gw the above example is a +3.3v, class k regulator with gull wing leads. weight=7.7 grams typical rev. p 1/11 note: see dscc smd 5962r05220 for dscc part number options.
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. m.s. kennedy corp. 4707 dey road, liverpool, new york 13088 phone (315) 701-6751 fax (315) 701-6752 www.mskennedy.com ordering information 8 lead configurations s= straight; u= bent up; d= bent down radiation hardened screening blank= industrial; h=mil-prf-38534 class h; k=mil-prf-38534 class k output voltage 1.5=+1.5v; 1.8=+1.8v; 1.9=+1.9v; 2.5=+2.5v; 2.8=+2.8v; 3.3=+3.3v; 5.0=+5.0v general part number msk5920-3.3 k rh u the above example is a +3.3v, class k regulator with leads bent up. weight=7.7 grams typical rev. p 1/11 note: see dscc smd 5962r05220 for dscc part number options.
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