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ISO-9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP. FEATURES:
HIGH CURRENT, SUPER LOW DROPOUT ADJUSTABLE VOLTAGE REGULATOR
5012
(315) 701-6751
4707 Dey Road Liverpool, N.Y. 13088 Extremely Low Dropout Voltage 0.45V @ 10 Amps Output Voltage Adjustable from +1.30V to +36V Low External Component Count Electrically Isolated Case Low Quiescent Current Output Current to 10 Amps Available in Two Package Styles Available with Three Lead Form Options
MIL-PRF-38534 QUALIFIED
DESCRIPTION:
The MSK 5012 voltage regulator output is fully programmable through the use of two external resistors. Ultra low dropout voltage specifications are realized due to the unique output configuration which uses an extremely low Rds(on) MOSFET as a pass element. Dropout voltages of 0.45V at ten amps are typical in this configuration which drives efficiency up and power dissipation down. Accuracy is guaranteed with a 1% initial output voltage tolerance that only varies 2% with temperature. The MSK 5012 is packaged in a space efficient 5 pin SIP package that is electrically isolated from the internal circuitry allowing direct heat sinking for efficient thermal dissipation.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
High Efficiency, High Current Linear Regulators Constant Voltage/Current Regulators System Power Supplies Switching Power Supply Post Regulators
1
Rev. H 10/02
ABSOLUTE MAXIMUM RATINGS

TC
ELECTRICAL SPECIFICATIONS
Parameter Output Voltage Range Ouput Voltage Tolerance 7 Input Voltage 2 Dropout Voltage 2 Dropout Voltage 2 Load Regulation Line Regulation Test Conditions 3 R2=10K IOUT=100mA; VIN=VOUT+3V With Respect to VOUT IOUT= 0A IOUT=10A VIN=VOUT+3V 100mA IOUT 9A (VOUT +1.5) VIN (VOUT+15), IOUT=100mA Group A Subgroup 1 2,3 1 1 1 2,3 1 2,3 1 2,3 1 MSK 5012B/E Min. 1.3 1.3 Typ. 0.3 1.0 0.002 0.4 0.5 0.5 0.3 4.5 45 0.7 5 Max. 36 1.0 2.0 36 0.010 0.75 1.0 2.0 1.0 1.0 10 10 0.8 1.248 1.3 1.21 Min. 1.3 MSK 5012 Typ. 0.3 0.002 0.5 0.5 0.3 4.5 45 0.7 5 1.24 Max. 36 1.5 36 0.010 1.0 1.5 1.5 12 0.8 1.26 Units V % % V V V % % % % mA mA dB C/W S V
Quiescent Current Ripple Rejection 2 Thermal Resistance 2 Output Settling Time VAdjust Voltage
2
VIN=VOUT+3V; IOUT=0A f=120Hz Junction to Case @ 125C To within 10mV (IOUT=0A) VIN = VOUT +3V
1.222 1.235
NOTES:
1 Output decoupled to ground using 47F minimum capacitor and R1=30K; R2=10K unless otherwise specified. 2 This parameter is guaranteed by design but need not be tested. Typical parameters are representative of actual device performance at 25C but are for reference only. 3 All output parameters are tested using a low duty cycle pulse to maintain TJ = TC. 4 Industrial grade and "E" suffix devices shall be tested to subgroup 1 unless otherwise specified. 5 Military grade devices ('B' suffix) shall be 100% tested to subgroups 1,2 and 3. 6 Subgroup 1 TA=TC=+25C Subgroup 2 TA=TC=+125C Subgroup 3 TA=TC=-55C 7 Does not include tolerance effects from external resistors.
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Rev. H 10/02

VIN IOUT TJ
Input Voltage Output Current Junction Temperature
36V 10A within SOA +175C
TST TLD
Storage Temperature Range -65C to +150C Lead Temperature Range 300C (10 Seconds) Case Operating Temperature MSK5012 -40C to +85C MSK5012B/E -55C to +125C
APPLICATION NOTES MINIMIZING OUTPUT RIPPLE:
The output voltage ripple of the MSK 5012 voltage regulator 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 capacitor directly across the load. Typically a 10F capacitor is a good starting point.
FILTER 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.
CASE CONNECTIONS:
The case of the MSK 5012 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.
HEAT SINK SELECTION:
To select a heat sink for the MSK 5012, the following formula for convective heat flow must be used. Governing Equation: Tj = Pd x (Rjc + Rcs + Rsa) + Ta WHERE: Tj = Junction Temperature Pd = Total Power Dissipation Rjc = Junction to Case Thermal Resistance Rcs = Case to Heat Sink Thermal Resistance Rsa = Heat Sink to Ambient Thermal Resistance Ta = Ambient Temperature 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 (Rsa). EXAMPLE: An MSK 5012 is configured for Vin = +7V and Vout = +3.3V. Iout is a continuous 10A DC level. The ambient temperature is +25C. The maximum desired junction temperature is 150C. Rjc = 0.8C/W and Rcs = 0.15C/W typically. Power Dissipation = (7V - 3.3V) x (10A) = 37 Watts Solve for Rsa: Rsa = 150C - 25C - 0.8C/W - 0.15C/W 37W In this example, a heat sink with a thermal resistance of no more than 2.43C/W must be used to maintain a junction temperature 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)
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 between 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 connected directly to pin 2 of the MSK 5012 and not to a ground plane inches away from the hybrid.
OUTPUT VOLTAGE ADJUSTMENT
The output voltage of the MSK 5012 can be adjusted from +1.3 volts to +36 volts. Refer to the following formula for resistor divider selection. R2 should be 10K for all applications. R1 = R2 ((VOUT / 1.235) -1) Figure one below illustrates proper resistor divider connection.
POWER DISSIPATION:
The output pass transistor in the MSK 5012 is rated to dissipate nearly 100 watts. The limiting factor of this device is effective dissipation of heat generated under such conditions. For example, to dissipate 100 watts, calculations show that the MSK 5012 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.
3
Rev. H 10/02
TYPICAL PERFORMANCE CURVES
4
Rev. H 10/02
MECHANICAL SPECIFICATIONS
TOP TAB Z- TAB
NOTE: ALL DIMENSIONS ARE 0.010 INCHES UNLESS OTHERWISE LABELED. ESD Triangle indicates Pin 1.
ORDERING INFORMATION
MSK5012 B T U
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-38535 CLASS H GENERAL PART NUMBER The above example is a Military grade regulator using the top tab package with leads bent up. 4707 Dey Road, Liverpool, New York 13088 Phone (315) 701-6751 FAX (315) 701-6752 www.mskennedy.com
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.
5
Rev. H 10/02

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