MIL-PRF-38534 AND 38535 CERTIFIED FACILITY
M.S.KENNEDY CORP.
HIGH CURRENT, VERY LOW OUTPUT
SURFACE MOUNT
VOLTAGE REGULATORS
5450
SERIES
FEATURES:
Very Low Output Voltage
Available in 0.7V, 0.8V, 0.9V, 1.0V, 1.2V, 1.3V and 1.5V
On Board Thermal Shut Down and Current Limit
1% Maximum Guaranteed Accuracy
Output Current to 5 Amps
Alternate Output Voltages Available
Contact MSK for MIL-PRF-38534 Qualification Status
DESCRIPTION:
The MSK5450 series voltage regulators offer high current and low output voltage capability ideal for use with low voltage
microprocessors. Low output impedance and minimal output capacitance requirements make the MSK 5450 an excellent
choice for ASIC and FPGA core voltage supplies. The device is available in +0.7V, +0.8V, +0.9V, +1.0V, +1.2V, +1.3V
and +1.5V output configurations with output accuracy guaranteed to 1% maximum. The MSK5450 series is packaged in
a 3 pin hermetically sealed power surface mount ceramic package.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
PIN-OUT INFORMATION
1 VIN
2 VOUT
3 Ground
PLD/FPGA Core Power Supply
ASIC Core Voltage Regulator
System Power Supplies
Switching Power Supply Post Regulators
Linear Point-of-Load Conversion
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8548-122 Rev. B 5/14
10
ABSOLUTE MAXIMUM RATINGS
VIN Input Voltage
PD
Power Dissipation
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+6.0V
Internally Limited
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TST Storage Temperature Range
TLD Lead Temperature
(10 Seconds)
TJ Operating Temperature
MSK5450 Series
MSK5450H Series
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-65°C to +150°C
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300°C
-40°C to +85°C
-55°C to +125°C
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ELECTRICAL SPECIFICATIONS
PART
NUMBER
NOTES:
OUTPUT
VOLTAGE
MSK5450-0.7
7
+0.7V
MSK5450-0.8
+0.8V
MSK5450-0.9
+0.9V
MSK5450-1.0
+1.0V
MSK5450-1.2
+1.2V
+1.3V
MSK5450-1.3
1 Output decoupled to ground using 10μF minimum capacitor unless otherwise specified.
2 This parameter is guaranteed by design but need not be tested.
+1.5V
MSK5450-1.5
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 devices shall be tested to subgroup 1 unless otherwise specified.
5 Military grade devices ('H' suffix) shall be 100% tested to subgroups 1,2,3.
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 internal thermal shutdown, maximum output current may not be available at all values of VIN-VOUT and temperatures.
See typical performance curves for clarification.
9 Not applicable to versions where VIN=VIN min.
10 Continuous operation at or above absolute maximum ratings may adversely effect the device performance and/or life cycle.
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THERMAL SHUTDOWN:
APPLICATION NOTES
The MSK5450 series of devices is equipped with a thermal shutdown
circuit that will turn off the device when the junction temperature
reaches approximately 150°C. It is important for the user to be
aware that high temperature operation will limit the current capability of the device due to this thermal shutdown protection. In cases of
maximum input voltage and high case temperature, the output current available may be less than 3 Amps. See curve below for clarification.
REGULATOR PROTECTION:
The MSK5450 series are high performance linear regulators for high
current, low voltage applications requiring fast transient response.
The devices are fully protected from damage due to fault conditions,
offering constant current limiting and thermal shutdown. The thermal
shutdown junction temperature is typically 150°C.
MINIMIZING POWER DISSIPATION:
To maximize the performance and reduce power dissipation of
the MSK5450 series devices, VIN should be maintained as close to
dropout or at VIN minimum when possible. See Input Supply Voltage
requirements. A series resistor can be used to lower VIN close to the
dropout specification, lowering the input to output voltage differential. In turn, this will decrease the power that the device is required
to dissipate. Knowing peak current requirements and worst case voltages, a resistor can be selected that will drop a portion of the excess
voltage and help to distribute the heating. The circuit below illustrates this method.
PACKAGE CONNECTIONS:
The MSK5450 series are highly thermally conductive devices and the
thermal path from the package heat sink to the internal junctions is
very short. Standard surface mount soldering techniques should be
used when mounting the device. Some applications may require additional heat sinking of the device.
The maximum resistor value can be calculated from the
following:
R1 max =
HEAT SINK SELECTION:
To select a heat sink for the MSK5450, the following formula for convective heat flow may be used:
VIN min - (VOUT max + VDROP)
IOUT peak + Quiescent Current
First, the power dissipation must be calculated as follows:
Where:
VIN min=Minimum input voltage
VOUT max=Maximum output voltage across the full
temperature range
VDROP=Worst case dropout voltage (Typically 500mV)
IOUT peak=Maximum load current
Quiescent Current=Max. quiescent current at Iout peak
Power Dissipation = (VIN - VOUT) x IOUT + VIN x Quiescent Current
Next, the user must select a maximum junction temperature.
The equation may now be arranged to solve for the required
heat sink to ambient thermal resistance (Rθsa).
EXAMPLE:
INPUT CAPACITOR:
An MSK5450-1.3 is configured for VIN=+1.8V and VOUT=+1.3V.
Iout is a continuous 5Amp DC level. Under these conditions the
maximum ground current would be 150mA. The ambient temperature
is +100°C and the maximum junction temperature is 125°C.
If the device is to be located more than 4 inches from the bulk supply
capacitance, a minimum 1uF capacitor should be placed as close to
the input pin as possible for proper bypassing. A smaller value capacitor such as 0.01uF should be placed in parallel with the larger
value capacitor. Larger input capacitor values will help to improve
ripple rejection.
Rθjc = 2.0°C/W and Rθcs = 0.5°C/W typically.
Power Dissipation = (1.8V - 1.3V) x 5A + (1.8 x 150mA)
OUTPUT CAPACITOR:
Solve for Rθsa given PD: = 2.77 Watts
The MSK5450 series devices require a minimum of external components to maintain stability. A minimum of output capacitance is necessary for stable operation. Due to the wide bandwidth design, the
device will operate with a wide range of capacitance and ESR values. For most applications, a 10uF ceramic capacitor will suffice.
Ideally, this should be an X7R ceramic capacitor or a tantalum capacitor due to their thermal performance. There is no upper limit to
the amount of output capacitance that may be used.
[
Rθsa = 125°C - 100°C
2.77W
]
- 2.0°C/W - 0.5°C/W
= 6.53°C/W
In this example, a heat sink with a thermal resistance of no
more than 6.5°C/W must be used to maintain a junction
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TYPICAL PERFORMANCE CURVES
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MECHANICAL SPECIFICATIONS
ALL DIMENSIONS ARE SPECIFIED IN INCHES
WEIGHT=2.0 GRAMS TYPICAL
ORDERING INFORMATION
MSK5450-1.3 H
SCREENING
BLANK= INDUSTRIAL; H= MIL-PRF-38534 CLASS H
OUTPUT VOLTAGE
0.7=+0.7V; 0.8=+0.8V; 0.9=+0.9V; 1.0=+1.0V;
1.2=+1.2V; 1.3=+1.3V; 1.5=+1.5V
GENERAL PART NUMBER
The above example is a +1.3V, Military regulator.
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REVISION HISTORY
M.S. Kennedy Corp.
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.
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