4707 dey road liverpool, n.y. 13088 m.s.kennedy corp. (315) 701-6751 features: 5010 series iso-9001 certified by dscc high current, super low dropout fixed voltage regulators extremely low dropout voltage 0.45v @ 10 amps available in 3.3v, 5.0v and 12.0v versions output voltages are internally set to 1.5% maximum ttl level enable pin electrically isolated case low quiescent current output current to 10 amps available in two package styles available with three lead form options typical applications high efficiency, high current linear regulators constant voltage/current regulators equivalent schematic mil-prf-38534 qualified description: the msk 5010 series voltage regulators are available in a +3.3v, +5.0v or +12.0v fixed output configuration. all three boast ultra low dropout specifications due to the utilization of a mosfet output pass transistor with extremely low rds(on). dropout voltages of 0.45v at 10 amps are typical, in this configuration, which drives efficiency up and power dissipation down. accuracy is guaranteed with a 1.5% maximum initial output voltage tolerance that varies only 2% with temperature. the msk 5010 series is packaged in a space efficient 5 pin sip that is electrically isolated from the internal circuitry allowing direct heat sinking for maximum heat dissipation. 1 rev. h 10/02 system power supplies switching power supply post regulators
part 7 number i out =100ma; v in =v out +3v i out = 0 a i out =10a v in =v out +3v 100ma i out 9a (v out +1.5v) v in ( v out +15v) i out =100ma v en =v in ; v in =v out +3v; i out =0a v en =0v; v in =v out +3v; i out =0a f=120hz junction to case to within 10mv output voltage tolerance dropout voltage 2 load regulation line regulation quiescent current ripple rejection 2 thermal resistance 2 enable input voltage 2 enable input current 2 output settling time 2 8 high low high low v in v en i out t j parameter msk 5010 series msk 5010b/e series input voltage enable voltage output current junction temperature 36v -0.3v to 36v 10a within soa +175c t st t ld t c storage temperature range lead temperature range (10 seconds) case operating temperature MSK5010 series MSK5010b/e series electrical specifications absolute maximum ratings -65c to +150c 300c -40c to +85c -55c to +125c 3 test conditions 1 2 notes: output decoupled to ground using 47f minimum capacitor unless otherwise specified. guaranteed by design but not 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 tj = tc. industrial grade and "e" suffix 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. after application of enable pulse +12.0v MSK5010-3.3 MSK5010-5.0 MSK5010-12 +3.3v +5.0v output voltage t a =t c =+25c t a =t c =+125c t a =t c = -55c group a subgroup 1 2,3 1 1 1 2,3 1 2,3 1,2,3 1,2,3 - - 1 1 1 1 - min. - - - - - - - - - - - - 2.4 - - - - typ. 0.3 1.0 0.002 0.45 0.5 0.5 0.3 0.5 4.5 0.15 45 0.7 1.2 1.2 12.5 0.8 5 max. 1.5 2.0 0.010 0.75 1.0 2.0 1.0 1.0 10 5.0 - 0.8 - 0.8 50 25 - min. - - - - - - - - - - - - 2.4 - - - - typ. 0.5 - 0.002 0.5 0.5 - 0.5 - 4.5 0.15 45 0.7 1.2 1.2 20 10 5 max. 1.5 - 0.015 1.0 1.5 - 1.5 - 10 5.0 - 1.0 - 0.8 50 25 - units % % v v % % % % ma m a db c/w v v m a m a m s 2 2 rev. h 10/02 3 4 5 6 7 8
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 175c. the equation may now be rearranged to solve for the required heat sink to ambient thermal resistance (r q sa). example; an msk 5010-3.3 is configured for vin = +7v and vout = +3.3v. iout is a continuous 10a dc level. the ambient tem- perature is +25c. the maximum desired junction tempera- ture is 150c. r q jc = 0.8c/w and r q cs = 0.15c/w typi- cally. power dissipation = (7v - 3.3v) x (10a) solve for r q sa: r q sa = 150c - 25c - 0.8c/w - 0.15c/w in this example, a heat sink with a thermal resistance of no more than 2.43c/w must be used to maintain a junction tem- perature of no more than 150c. the thermalloy corporation makes a heat sink with a thermal resistance of 2.2c/w that would work well for this application. (see thermalloy part number 7023) application notes heat sink selection: minimizing output ripple: to select a heat sink for the msk 5010, the following formula for convective heat flow must 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 the output voltage ripple of the msk 5010 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 and is best determined by experimentation. transient load response can also be improved by placing a (10uf to 20uf) capacitor directly across the load. charge capacitor: for all applications, the user must connect a 1.0uf capacitor from pin 5 directly to ground. this capacitor is part of the circuit which drives the gate of the internal mosfet. approximately three times the voltage seen on the input will appear across this capacitor. careful attention must be paid to capacitor voltage rating since voltages larger than the power supply are present. 37w case connections: the case of the msk 5010 is electrically isolated from the internal circuitry so that a direct connection can be made to the heat sink for most efficient heat dissipation. however, it may be necessary in some applications to connect the case to ground. grounding the case will help eliminate oscillations and produce a clean, noise free output. load regulation: for best results, the ground pin should be connected directly to the load (see next note). this effectively reduces the ground loop effect and eliminates excessive voltage drop in the sense leg. it is also important to keep the output connection be- tween the regulator and the load as short as possible since this directly affects the load regulation. for example, if 20 gauge wire were used which has a resistance of about .008 ohms per foot, this would result in a drop of 8mv/ft at a load current of 1 amp. load connections: in voltage regulator applications where very large load currents 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 same holds true for the connection from the low end of the load to ground. for best load regulation, the low end of the load must be con- nected directly to pin 2 of the msk 5010 and not to a ground plane inches away from the hybrid. enable/shutdown pin: the msk 5010 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 a maximum of 5a of quiescent current. power dissipation: the output pass transistor in the msk 5010 is rated to dissipate nearly 100 watts. the limiting factor of this device is effective dissipation of heat generated under such condi- tions. for example, to dissipate 100 watts, calculations show that the msk 5010 would have to be bolted to the underbelly of a submarine submerged in the arctic ocean! careful consideration must be paid to heat dissipation and junction temperature when applying this device. = 37 watts 3 rev. h 10/02
typical performance curves 4 rev. h 10/02
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. mechanical specifications m.s. kennedy corp. 4707 dey road, liverpool, new york 13088 phone (315) 701-6751 fax (315) 701-6752 www.mskennedy.com 5 rev. h 10/02 top tab z- tab all dimensions are 0.010 inches unless otherwise labeled ordering information lead configurations s= straight; u= bent up; d= bent down package style t= top tab; z= z pack screening blank=industrial; e=extended reliability b=mil-prf-38534 class h output voltage 3.3=+3.3v; 5=+5.0v; 12=+12.0v general part number MSK5010-3.3 b t u the above example is a +3.3v, military regulator using the top tab package with leads bent up. note: esd triangle indicates pin 1.
|
