1 4707 dey road liverpool, n.y. 13088 m.s.kennedy corp. (315) 701-6751 features: series very high current, low dropout voltage regulators electrically isolated top tab or z tab sip extremely low dropout voltage: 425mv @ 7.5 amps available in 3.3v, 5.0v, 12.0v and adjustable versions open collector error flag output ttl level enable pin: zero current shutdown mode reverse battery and load dump protection low ground current: 120ma typical at full load 1% maximum guaranteed accuracy output current to 7.5 amps mil-prf-38534 qualified description: the msk 5175 series voltage regulators are available in +3.3v, +5.0v, +12.0v or adjustable output configura- tions. all boast ultra low dropout specifications due to the utilization of a super pnp output pass transistor with monolithic technology. dropout voltages of 425mv at 7.5 amps are typical in this configuration, which drives efficiency up and power dissipation down. accuracy is guaranteed with a 1% maximum output voltage tolerance. the series also offers a ttl/cmos compatible on/off enable function as well as an output flag pin. the msk 5175 series is packaged in a space efficient 5 pin power sip available in two styles with three lead bend options. equivalent schematic typical applications pin-out information high efficiency, ultra high current linear regulators constant voltage/current regulators system power supplies switching power supply post regulators battery powered equipment enable vin ground vout adjust 1 2 3 4 5 msk5175-00 enable vin ground vout flag 1 2 3 4 5 msk5175-3.3,-5.0,-12 schematic shown for fixed output voltage versions 5175 iso-9001 certified by dscc rev. c 7/00
output current limit output noise shutdown output current flag output leakage flag output on voltage flag threshold reference voltage reference voltage temp drift adjust pin bias current thermal resistance thermal shutdown max. 1.0 2.0 200 600 1.0 2.0 0.5 1.0 15 75 - - - 0.8 75 2 20 2 0.4 - 1.26 - 120 1.3 - output voltage tolerance dropout voltage load regulation line regulation ground current enable input voltage enable input current storage temperature range lead temperature (10 seconds soldering) operating temperature msk 5175 series msk 5175b series d v out =-1%; i out = 250m a d v out =-1%; i out =7.5a v in =v out +5v 10ma i out 7.5a (v out +1v) v in 26v i out =10ma v out =0v; v in =v out +1v v in =v out +1v; i out =4a v in =v out +1v; i out =7.5a c l =33f; 10hz f 100khz v enable 0.8v v oh =26v i ol 250a; v in =v out -2v v in =v out -7% normal operation normal operation full temp; v in =v out +1v junction to case t j input voltage (100ms 1%d.c.) input voltage enable voltage output current adjustable +3.3v +5.0v +12.0v v inp v in v en i out parameter t st t ld t j electrical specifications absolute maximum ratings -65c to +150c 300c -40c to +85c -55c to +125c 1 test conditions 1 2 3 4 5 6 7 8 9 notes: output decoupled to ground using 33f minimum capacitor unless otherwise specified. this parameter is guaranteed by design but need not be tested. typical parameters are representative of actual device performance but are for reference only. all output parameters are tested using a low duty cycle pulse to maintain t j = t c . industrial grade devices shall be tested to subgroup 1 unless otherwise specified. military grade devices ('b' suffix) shall be 100% tested to subgroups 1,2 and 3. subgroup 1 subgroup 2 subgroup 3 please consult the factory if alternate output voltages are required. applies to msk5175-00 adjustable version only. applies to fixed output devices only. part number output voltage t c =+25c t j =+125c t a =-55c msk5175-00 msk5175-3.3 msk5175-5.0 msk5175-12 high/on low/off high/on low/off msk 5175b series min. - - - - - - - - - - - - 2.4 - - - - - - - 1.22 - - - - typ. 0.5 1.0 80 425 0.2 0.3 0.05 0.5 9.5 35 120 260 1.2 1.2 20 1 10 0.01 0.2 75 1.24 20 40 0.9 135 typ. 0.5 - 80 425 0.2 0.3 0.05 0.5 9.5 35 120 260 1.2 1.2 20 1 10 0.01 0.2 75 1.24 20 40 0.9 135 msk 5175 series min. - - - - - - - - - - - - 2.4 - - - - - - - 1.22 - - - - max. 1.0 - 225 625 1.2 - 0.6 - 15 80 - - - 0.8 75 2 20 2 0.4 - 1.26 - 150 1.5 - units 2 2 2 2 8 2 8 8 2 9 9 2 9 2 3 group a subgroup 1 2,3 1 1 1 2,3 1 2,3 - - - - 1 1 1 1 - - 1 - 1 - - - - 2 i out =10ma; v in =v out +1v 2 -20v to +60v 26v -0.3v to 26v 8a 2 2 2 2 % % mv mv % % % % a ma ma v v v a a a a v mv v ppm/c na c/w c 2 rev. c 7/00
first, the power dissipation must be calculated as follows: power dissipation = (vin - vout) x iout next, the user must select a maximum junction temperature. the absolute maximum allowable junction temperature is 125c. the equation may now be rearranged to solve for the required heat sink to ambient thermal resistance (r q sa). example; an msk 5175-3.3 is configured for vin=+5v and vout=+3.3v. iout is a continuous 1a dc level. the ambient temperature is +25c. the maximum desired junction tem- perature is 125c. r q jc = 1.3c/w and r q cs = 0.5c/w typically. power dissipation = (5v - 3.3v) x (1a) = 1.7 watts solve for r q sa: r q sa = 125c - 25c - 1.3c/w - 0.5c/w in this example, a heat sink with a thermal resistance of no more than 57c/w must be used to maintain a junction tem- perature of no more than 125c. application notes heat sink selection: to select a heat sink for the msk 5175, the following formula for convective heat flow may be used. governing equation: tj = pd x (r q jc + r q cs + r q sa) + ta where: tj = junction temperature pd = total power dissipation r q jc = junction to case thermal resistance r q cs = case to heat sink thermal resistance r q sa = heat sink to ambient thermal resistance ta = ambient temperature regulator protection: the msk 5175 series is fully protected against reversed input polarity, overcurrent faults, overtemperature conditions (pd) and transient voltage spikes of up to 60v. if the regulator is used in dual supply systems where the load is returned to a negative supply, the output voltage must be diode clamped to ground. msk5175-00 output adjustment: the msk 5175-00 is an adjustable version in the series of high performance regulators. the diagram below illustrates proper adjustment technique for the output voltage. the series resis- tance of r1+r2 should be selected to pass the minimum regu- lator output current requirement of 10ma. device/case connection: the msk 5175 series are highly thermally conductive devices and the thermal path from the package heat sink to the internal junctions is very short. since the case is electrically isolated from the internal circuitry, the package can be directly con- nected to a heat sink. flag output pin: all of the fixed output voltage versions of the msk 5175 series are equipped with a flag output pin. since the flag pin is an open collector configuration it can be pulled up to any voltage between 3v and 26v. this feature allows direct interfacing to practically any logic. this active low output has a typical level of 0.22v when the flag comparator detects an "out of regula- tion" condition. flag states include low input voltage, out of regulation and output current limit. extremely high level input voltage transients will also cause the flag output pin to acti- vate. enable pin: the msk 5175 series of voltage regulators are equipped with a ttl compatible enable pin. a ttl high level on this pin acti- vates the internal bias circuit and powers up the device. a ttl low level on this pin places the controller in shutdown mode and the device draws only 5a of quiescent current. if the enable function is not used, simply connect the enable pin to the input. load connections: in voltage regulator applications where very large load cur- rents are present, the load connection is very important. the path connecting the output of the regulator to the load must be extremely low impedance to avoid affecting the load regulation specifications. any impedance in this path will form a voltage divider with the load. the msk 5175 series requires a mini- mum of 10ma of load current to stay in regulation. output capacitor: the output voltage ripple of the msk 5175 series voltage regu- lators can be minimized by placing a filter capacitor from the output to ground. the optimum value for this capacitor may vary from one application to the next, but a minimum of 33f is recommended for optimum performance. transient load re- sponse can also be improved by placing a capacitor directly across the load. 1.7w 3 rev. c 7/00 = 57.02c/w
typical performance curves 4 rev. c 7/00
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. mechanical specifications m.s. kennedy corp. 4707 dey road, liverpool, new york 13088 phone (315) 701-6751 fax (315) 701-6752 www.mskennedy.com ordering information lead configurations s= straight; u= bent up; d= bent down package style t= top tab; z= z pack screening blank= industrial; b= mil-prf-38534 output voltage 00=adj; 3.3=+3.3v; 5.0=+5.0v; 12=+12.0v general part number msk5175-3.3 b t u the above example is a +3.3v, military regulator using the top tab package with leads bent up. note: all dimensions are 0.010 inches unless otherwise labeled. esd triangle indicates pin 1. 5 rev. c 7/00
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