MIL-PRF-38534 CERTIFIED
M.S.KENNEDY CORP.
HIGH CURRENT,
LOW DROPOUT
VOLTAGE REGULATORS
4707 Dey Road Liverpool, N.Y. 13088
5131
SERIES
(315) 701-6571
FEATURES:
Electrically Isolated Top Tab or Z Tab SIP
Extremely Low Dropout Voltage: 350mV @ 3 Amps
Available in +1.5V,+1.7V,+1.8V,+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: 42mA Typical at Full Load
1% Maximum Guaranteed Accuracy
Output Current to 3 Amps
Contact MSK for MIL-PRF-38534 Qualification Status
DESCRIPTION:
The MSK 5131 series voltage regulators are available in +1.5V,+1.7V,+1.8V,+1.9V,+2.5V,+3.3V,+5.0V and
+12.0V configurations. All boast ultra low dropout specifications due to the utilization of a super PNP output pass
transistor with monolithic technology. Dropout voltages of 350mV at 3 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. The MSK 5131 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
1
2
3
4
5
High Efficiency, High Current Linear Regulators
Constant Voltage/Current Regulators
System Power Supplies
Switching Power Supply Post Regulators
Battery Powered Equipment
1
Enable
Vin
Ground
Vout
N/C
Rev. B 2/06
9
ABSOLUTE MAXIMUM RATINGS
VINP
VIN
VEN
IOUT
TST
TLD
Input Voltage (100mS 1%D.C.) -20V to +60V
Input Voltage
26V
Enable Voltage
-0.3V to 26V
Output Current
3.5A
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TJ
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Storage Temperature Range -65°C to +150°C
Lead Temperature
300°C
(10 Seconds Soldering)
Operating Temperature
MSK 5131 Series
-40°C to +85°C
MSK 5131H/E Series
-55°C to +125°C
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ELECTRICAL SPECIFICATIONS
Test Conditions 1 3
Parameter
Load Regulation
2
8
Line Regulation
Output Current Limit 2
Ground Current
Output Noise
Min.
Typ.
1
-
2,3
∆VOUT=-1%; IOUT=100mA
1
∆VOUT=-1%; IOUT=3A
1
-
VIN=VOUT+1.5V
1
-
10mA ≤ IOUT ≤ 2.5A
2,3
-
(VOUT +1V) ≤ VIN ≤ 26V
1
-
IOUT=10mA
2,3
-
VOUT=0V; VIN=VOUT+1V
-
-
VIN=VOUT+1V; IOUT=1.5A
-
VIN=VOUT+1V; IOUT=3A
-
CL=20µF; 10Hz ≤ f ≤ 100KHz
-
-
HIGH/ON
1
2.4
LOW/OFF
1
HIGH/ON
1
LOW/OFF
1
-
VENABLE ≤ 0.8V
-
-
Junction to Case @ 125°C
-
-
TJ
-
-
IOUT=10mA; VIN=VOUT+1V
Output Voltage Tolerance
Dropout Voltage
Group A MSK 5131H/E SERIES
Subgroup
2
2
Enable Input Voltage
2
2
Enable Input Current
Shutdown Output Current 2
Thermal Resistance
Thermal Shutdown
2
2
MSK 5131 SERIES
Max.
Min.
Typ.
Max.
Units
±0.5
±1.0
-
±0.5
±1.0
%
-
±1.0
±2.0
-
-
-
%
-
80
175
-
80
200
mV
350
600
-
350
625
mV
±0.2
±1.0
-
±0.2
±1.2
%
±0.3
±2.0
-
±0.3
-
%
±0.05
±0.5
-
±0.05
±0.6
%
±0.5
±1.0
-
±0.5
-
%
4.5
5.0
-
4.5
5.0
A
-
20
45
-
20
45
mA
-
42
-
-
42
-
mA
400
-
-
400
-
µV
1.2
-
2.4
1.2
-
V
-
1.2
0.8
-
1.2
0.8
V
-
20
600
-
20
600
µA
-
2
-
-
2
µA
10
500
-
10
500
µA
2.1
2.4
-
2.1
2.5
°C/W
135
-
-
135
-
°C
NOTES:
1 Output decoupled to ground using 27µF minimum capacitance unless otherwise specified.
2 This parameter is guaranteed by design but need not be 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 unless otherwise specified.
5 Military grade devices ('H' suffix) shall be 100% tested to subgroups 1,2 and 3.
6 Subgroup 1
TC=+25°C
Subgroup 2
TJ=+125°C
Subgroup 3
TA=-55°C
7 Please consult the factory if alternate output voltages are required.
8 Due to current limit, maximum output current may not be available at all values of VIN-VOUT and
temperatures. See typical performance curves for clarification.
9 Continuous operation at or above absolute maximum ratings may adversely effect the device
performance and/or life cycle.
2
Rev. B 2/06
APPLICATION NOTES
REGULATOR PROTECTION:
HEAT SINK SELECTION:
The MSK 5131 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.
To select a heat sink for the MSK 5131, the following formula
for convective heat flow may be used.
Governing Equation:
Tj = Pd x (Rθjc + Rθcs + Rθsa) + Ta
WHERE:
Tj = Junction Temperature
Pd = Total Power Dissipation
Rθjc = Junction to Case Thermal Resistance
Rθcs = Case to Heat Sink Thermal Resistance
Rθsa = Heat Sink to Ambient Thermal Resistance
Ta = Ambient Temperature
OUTPUT CAPACITOR:
The output voltage ripple of the MSK 5131 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, but a minimum of 10µF
is recommended for optimum performance. This capacitor need
not be an expensive low ESR type: aluminum electrolytics are
adequate. In fact, extremely low ESR capacitors may contribute to instability. Tantalum 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.
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 125°C.
The equation may now be rearranged to solve for the required
heat sink to ambient thermal resistance (Rθsa).
LOAD CONNECTIONS:
EXAMPLE:
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.
An MSK 5131-3.3 is configured for Vin=+5V and
Vout=+3.3V. Iout is a continuous 1A DC level. The ambient
temperature is +25°C. The maximum desired junction temperature is 125°C.
Rθjc = 2.4°C/W and Rθcs = 0.15°C/W for most thermal greases
Power Dissipation =
(5V - 3.3V) x (1A)
= 1.7 Watts
Solve for Rθsa:
Rθsa = 125°C - 25°C - 2.4°C/W - 0.15°C/W
1.7W
ENABLE PIN:
The MSK 5131 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 10µA of quiescent current. If the enable function is not used, simply connect the
enable pin to the input.
= 56.27°C/W
In this example, a heat sink with a thermal resistance of no
more than 56°C/W must be used to maintain a junction temperature of no more than 125°C.
DEVICE/CASE CONNECTION:
The MSK 5131 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.
3
Rev. B 2/06
TYPICAL PERFORMANCE CURVES
4
Rev. B 2/06
MECHANICAL SPECIFICATIONS
NOTE: ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED.
ESD Triangle indicates Pin 1.
WEIGHT = 7.5 GRAMS TYPICAL.
ORDERING INFORMATION
MSK5131-3.3 H 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
H=MIL-PRF 38534 CLASS H
OUTPUT VOLTAGE
1.5=+1.5V; 1.7=+1.7V; 1.8=+1.8V; 1.9=+1.9V;
2.5=+2.5V; 3.3=+3.3V; 5.0=+5.0V; 12=+12.0V
GENERAL PART NUMBER
The above example is a +3.3V, Military regulator using the top tab package with leads bent up.
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.
Contact MSK for MIL-PRF-38534 qualification status.
5
Rev. B 2/06