1 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 +1.5v,+1.7v,+1.9v,+2.5v,+3.3v,+5.0v and +12.0v ttl level enable pin: zero current shutdown mode reverse battery and load dump protection low ground current: 130ma typical at full load 1% maximum guaranteed accuracy output current to 7.5 amps mil-prf-38534 and 38535 certified facility description: the msk5176 series voltage regulators are available in +1.5v,+1.7v,+1.9v,+2.5v,+3.3v,+5.0v and +12.0v confgura - tions. all boast ultra low dropout specifcations 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 confguration, which drives effciency 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. the msk5176 series is packaged in a space effcient 5 pin power sip available in two styles with three lead bend options. equivalent schematic typical applications pin-out information high effciency, ultra high current linear regulators constant voltage/current regulators system power supplies switching power supply post regulators battery powered equipment enable vin ground vout nc 1 2 3 4 5 5176 case=isolated 8548-47 rev. d 3/16
? vout=-1%; i out = 250m a ? vout=-1%; i out =7.5a vin=vout+1.5v 10ma i out 7a (vout +1v) vin 26v i out =10ma vout=0v; vin=vout+1v vin=vout+1v; i out =4a vin=vout+1v; i out =7.5a c l )+ v enable 0.8v junction to case @ 125c t j output current limit output noise shutdown output current thermal resistance thermal shutdown max. 1.0 2.0 200 600 1.0 2.0 0.5 1.0 15 85 - - - 0.8 600 2 500 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 msk5176 series msk5176h series input voltage (100ms 1%d.c.) input voltage enable voltage output current vin p vin 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 10 11 notes: 2xwsxwghfrxsohgwrjurxqgxvlqj)plqlpxpfdsdflwdqfhxqohvvrwkhuzlvhvshflhg this parameter is guaranteed by design but need not be tested. 7slfdosdudphwhuvduhuhsuhvhqwdwlyhridfwxdoghylfhshuirupdqfhexwduhiruuhihuhqfhrqo all output parameters are tested using a low duty cycle pulse to maintain t j = t c . ,qgxvwuldojudghghylfhvvkdooehwhvwhgwrvxejurxsxqohvvrwkhuzlvhvshflhg 0lolwdujudghghylfhv+vxivkdooehwhvwhgwrvxejurxsvdqg subgroup 1 subgroup 2 subgroup 3 3ohdvhfrqvxowwkhidfwrulidowhuqdwhrxwsxwyrowdjhvduhuhtxluhg xhwrfxuuhqwolplwpdlpxprxwsxwfxuuhqwpdqrwehdydlodeohdwdooydoxhvri9,19287 dqgwhpshudwxuhv6hhwslfdoshuirupdqfh fxuyhvirufodulfdwlrq 7khrxwsxwfxuuhqwolplwixqfwlrqsurylghvsurwhfwlrqiurpwudqvlhqwryhuordgvexwlwpdhfhhgwkhpdlpxpfrqwlqxrxvudwlqj continuous operation in current limit may damage the device. rqwlqxrxvrshudwlrqdwruderyhdevroxwhpdlpxpudwlqjvpddgyhuvhohi ihfwwkhghylfhshuirupdqfhdqgruolihffoh ,qwhuqdovroghuuhrzwhpshudwxuhlvgrqrwhfhhg t c =+25c t c =+125c t c =-55c +,+21 2:2)) +,+21 2:2)) msk5176h series min. - - - - - - - - - - - - 2.4 - - - - - - typ. 0.5 1.0 80 425 0.2 0.3 0.05 0.5 9.5 45 130 260 1.2 1.2 100 - 10 0.9 135 typ. 0.5 - 80 425 0.2 0.3 0.05 0.5 9.5 45 130 260 1.2 1.2 100 - 10 0.9 135 msk5176 series min. - - - - - - - - - - - - 2.4 - - - - - - max. 1.0 - 225 625 1.2 - 0.6 - 15 90 - - - 0.8 600 2 500 1.5 - units 2 2 2 2 3 group a subgroup 1 2,3 1 1 1 2,3 1 2,3 - - - - 1 1 1 1 - - - 2 i out =10ma; vin=vout+1v 2 -20v to +60v 26v -0.3v to 26v 7.5a 2 2 2 2 % % mv mv % % % % a ma ma v v v a a a : c 2 8 10 9 11 5hy
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 t sa). example; an msk5176-3.3 is confgured for vin=+5v and vout=+3.3v. iout is a continuous 1a dc level. the ambient temperature is +25c. the maximum desired junction temperature is 125c. r t jc = 1.3c/w and r q cs = 0.15c/w for most thermal greases power dissipation = (5v - 3.3v) x (1a) = 1.7 watts solve for r q sa: r t sa = 125c - 25c - 1.3c/w - 0.15c/w in this example, a heat sink with a thermal resistance of no more than 57c/w must be used to maintain a junction temperature of no more than 125c. to select a heat sink for the msk5176, the following formula for convective heat fow may be used. governing equation: tj = pd x (r t jc + r t cs + r t sa) + ta where: tj = junction temperature pd = total power dissipation r t jc = junction to case thermal resistance r t cs = case to heat sink thermal resistance r t sa = heat sink to ambient thermal resistance ta = ambient temperature application notes heat sink selection: regulator protection: the msk5176 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. device/case connection: the msk5176 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 connected to a heat sink. enable pin: the msk5176 series of voltage regulators are equipped with a ttl compatible enable pin. a ttl high level on this pin activates 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 approximately 10a 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 currents are present, the load connection is very important. the path con - necting the output of the regulator to the load must be extremely low impedance to avoid affecting the load regulation specifcations. any impedance in this path will form a voltage divider with the load. output capacitor: the output voltage ripple of the msk5176 series voltage regulators can be minimized by placing a flter 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. this capacitor need not be an expen - sive low esr type: aluminum electrolytics are adequate. in fact, extremely low esr capacitors may contribute to instability. tan - talum capacitors are recommended for systems where fast load transient response is important. transient load response can also be improved by placing a capacitor directly across the load. 1.7w 3 = 57.37c/w 8548-47 rev. d 3/16
typical performance curves 4 8548-47 rev. d 3/16
5 mechanical specifications ordering information lead configurations s= straight; u= bent up; d= bent down package style t= top tab screening blank= industrial; h=mil-prf 38534 class h output voltage 1.5=+1.5v; 1.7=+1.7v; 1.9=+1.9v; 2.5=+2.5v 3.3=+3.3v; 5.0=+5.0v; 12=+12.0v general part number msk5176-3.3 h t u the above example is a +3.3v, military regulator using the top tab package with leads bent up. 8548-47 rev. d 3/16 weight=7.7 grams typical esd triangle indicates pin 1 all dimensions are specified in inches
6 ordering information lead configurations s= straight; u= bent up; d= bent down package style z= z pack screening blank= industrial; h=mil-prf 38534 class h output voltage 1.5=+1.5v; 1.7=+1.7v; 1.9=+1.9v; 2.5=+2.5v 3.3=+3.3v; 5.0=+5.0v; 12=+12.0v general part number msk5176-3.3 h z u weight=8.1 grams typical esd triangle indicates pin 1 all dimensions are specified in inches mechanical specifications 8548-47 rev. d 3/16
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 specifcations 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. msk www.anaren.com/msk 7 8548-47 rev. d 3/16 revision history
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