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ISO-9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP. FEATURES:
HIGH CURRENT, SUPER LOW DROPOUT FIXED VOLTAGE REGULATORS
5020
SERIES
(315) 701-6751
4707 Dey Road Liverpool, N.Y. 13088 Extremely Low Dropout Voltage: 0.50V @ 20 Amps Available in 3.3V, 5.0V and 12.0V versions Output Voltages Are Internally Set to 1% TTL Level Enable Pin Externally Programmable Current Limit Low Quiescent Current Available Fully Qualified to Mil-PRF-38534 Output Current to 20 Amps Regulation Dropout Fault Pin
MIL-PRF-38534 CERTIFIED
DESCRIPTION:
The MSK 5020 series voltage regulators are available in +3.3V, +5.0V or +12.0V fixed output configurations. 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 0.50V at 20 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 varies only 2% with temperature. A TTL input level can be used to enable/disable the device and a regulation dropout Fault pin provides a means of monitoring the output level. The MSK 5020 series is packaged in a thermally efficient 12 pin power dip.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
High Efficiency, High Current Linear Regulators Constant Voltage/Current Regulators System Power Supplies Switching Power Supply Post Regulators 1 2 3 4 5 6
1
PIN-OUT INFORMATION
Enable NC Ground Filter Capacitor Input Fault 12 11 10 9 8 7 Output Output Sense VSC VSC Case Connection
Rev. F 1/05
ABSOLUTE MAXIMUM RATINGS

9
TC
ELECTRICAL SPECIFICATIONS
Parameter Output Voltage Tolerance Test Conditions 1 3 IOUT=0A; VIN=VOUT+1V Group A MSK 5020B/E SERIES Subgroup 1 2,3 Dropout Voltage 2 IOUT= 0A IOUT=20A Load Regulation VIN=VOUT+1V 0A IOUT 10A Line Regulation (VOUT +1V) VIN (VOUT+15V) IOUT=0A VEN=5V; VIN=VOUT+1V; IOUT=0A Quiescent Current VEN=0V; VIN=VOUT+1V; IOUT=0A 2 Ripple Rejection 2 Thermal Resistance 2 f=120Hz Junction to Case @ 125C HIGH LOW Enable Input Current 2 HIGH LOW Output Settling Time 2 Fault Output Voltage 2 8 9 To within 10mV (IOUT=0A) IFAULT=1mA HIGH LOW Fault Output Sink Current Range 2 2,3 1 2,3 1 1 1 1 2.4 1 20 10 10 45 0.8 1.2 1.2 20 10 0.5 VIN 0.09 30 50 50 1.0 0.8 50 25 10 2.4 1 10 45 0.8 1.2 1.2 20 10 0.5 VIN 0.09 50 1.1 0.8 50 25 10 mA A A dB C/W V V A A mS V V mA 1 1 1 2,3 1 2,3 1 Min. Typ. 0.5 1.0 0.002 0.50 0.5 0.5 0.5 0.5 20 Max. 1.0 2.0 0.010 0.75 1.0 2.0 1.0 1.0 30 MSK 5020 SERIES Min. Typ. 0.5 0.002 0.5 0.5 0.5 20 Max. 1.0 0.010 1.0 1.0 1.0 30 Units % % V V % % % % mA
Enable Input Voltage 2
NOTES:
1 Output decoupled to ground using 33F minimum capacitor and RSC=0 unless otherwise specified. 2 Guarateed by design but not tested. Typical parameters are representative of actual device performance 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 only unless otherwise specified. 5 Military grade devices ('B' suffix) shall be 100% tested to subgroups 1,2 and 3. TA=TC=+25C 6 Subgroup 1 Subgroup 2 TA=TC=+125C Subgroup 3 TC=TC=-55C 7 After application of enable pulse. 8 Fault pin connected to VIN through a 5.1K resistor for MSK5020-5.0. 9 Continuous operation at or above absolute maximum ratings may adversly effect the device performance and/or life cycle.
PART NUMBER
MSK5020-3.3 MSK5020-5.0 MSK5020-12
OUTPUT VOLTAGE
+3.3V +5.0V +12.0V
2
Rev. F

VIN VEN IOUT TJ
Input Voltage Enable Voltage Output Current Junction Temperature
36V -0.3V to 36V 20A within SOA +175C
TST TLD
Storage Temperature Range -65C to +150C Lead Temperature Range 300C (10 Seconds) Case Operating Temperature MSK5020 Series -40C to +85C MSK5020B/E Series -55C to +125C
1/05
APPLICATION NOTES
MINIMIZING OUTPUT RIPPLE:
The output voltage ripple of the MSK 5020 series voltage regulators 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 33uF or larger capacitor directly across the load.
FILTER CAPACITOR:
For all applications, the user must connect a 1.0uF capacitor from pin 4 directly to ground. This capacitor is part of the circuit which drives the gate of the internal MOSFETS. 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.
HEAT SINK SELECTION: CASE CONNECTIONS:
The case of the MSK 5020 is connected to pin seven of the package but isolated from the internal circuitry allowing direct attachment of the heat sink to the case. It may be necessary in some applications to ground the case to limit noise or eliminate oscillations on the output. Pin seven can be left as a no connect if the designer chooses. To select a heat sink for the MSK 5020, 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 5020-3.3 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 tempera ture is 150C. Rjc = 1.0C/W and Rcs = 0.15C/W typically. Power Dissipation = (7V - 3.3V) x (10A) = 37 Watts Solve for Rsa: Rsa = 150C - 25C - 1.0C/W - 0.15C/W 37W In this example, a heat sink with a thermal resistance of no more than 2.23C/W must be used to maintain a junction temperature of no more than 150C.
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 80mV/ft at a load current of 10 amps.
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 3 of the MSK 5020 and not to a ground plane inches away from the hybrid.
ENABLE/DISABLE PIN:
The MSK 5020 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 only 10A of quiescent current. This pin can be connected to VIN if the enable function is not desired.
POWER DISSIPATION:
The output pass transistors in the MSK 5020 are rated to dissipate nearly 200 watts. The limiting factor of this device is effective dissipation of heat generated under such conditions. For example, to dissipate 200 watts, calculations show that the MSK 5020 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.
FAULT PIN CONNECTIONS
Pin 6 of the MSK 5020 series is the Fault pin. When the output voltage drops 6% or more below its nominal value, the voltage level on the Fault pin drops to a logic low (typically less than 0.1 volts). This pin can be used to drive a light emitting diode or other external circuitry as long as the current is limited to less than 10.0mA (see typical connection diagram). The Fault pin is an open collector output so the high state output voltage will be equal to the pull up voltage since no current flows under these conditions.
CURRENT LIMIT CONNECTIONS
To implement current limiting, a sense resistor (Rsc) must be placed from pin 5 to pins 8,9 and 10 as shown in the typical connection diagram. When the voltage drop across the sense resistor reaches 35mV, the internal control loop limits the output current only enough to maintain 35mV across the sense resistor. The device is not disabled. The following formula may be used to find the correct value of sense resistance: RSC=35mV/ILIM If current limit is not required simply connect the Vsc pins directly to the input voltage along with the sense pin. Refer to the typical connection diagram for an illustration. 3 Rev. F 1/05
TYPICAL PERFORMANCE CURVES
4
Rev. F
1/05
TYPICAL CONNECTION DIAGRAM
The above connection diagram illustrates an MSK 5020-3.3 regulator. Q1 turns on the Fault L.E.D. when pin 6 of the hybrid drops to a logic low. Current into pin 6 is limited to approximately 1mA by the 12K resistor from pin 5 to pin 6. The optimum value of capacitance COUT may vary from one application to the next depending on the load applied. 33F is a good starting point. The ENABLE input is TTL compatible but can be tied to the input voltage when shutdown is not needed. RSC should be selected for the desired current limit. See current limit connections application note.
5 Rev. F 1/05
MECHANICAL SPECIFICATIONS
WEIGHT= 22 GRAMS TYPICAL ESD Triangle indicates Pin 1. NOTE: ALL DIMENSIONS ARE 0.010 INCHES UNLESS OTHERWISE LABELED.
ORDERING INFORMATION
MSK5020-3.3 B
SCREENING BLANK= INDUSTRIAL; E=EXTENDED RELIABILITY B=MIL-PRF-38534 CLASS H OUTPUT VOLTAGE 3.3=+3.3V; 5.0=+5.0V; 12.0=+12.0V GENERAL PART NUMBER
The above example is a +3.3V, Military regulator.
M.S. Kennedy Corp.
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.
6
Rev. F
1/05

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