MIL-PRF-38534 AND 38535 CERTIFIED FACILITY
5115
HIGH CURRENT,
LOW DROPOUT
VOLTAGE REGULATOR
FEATURES:
Electrically Isolated Top Tab or Z Tab SIP
Extremely Low Dropout Voltage: 350mV @ 1.5 Amps
Available Adjustable Version only
TTL Level Enable Pin: Zero Current Shutdown Mode
Reverse Battery and Load Dump Protection
Low Ground Current: 22mA Typical at Full Load
1% Maximum Guaranteed Accuracy
Output Current to 1.5 Amps
DESCRIPTION:
The MSK5115 voltage regulator is available in the adjustable output configuration only. The ultra low dropout specification
is due to the utilization of a super PNP output pass transistor with monolithic technology. Dropout voltages of 350mV at 1.5
amps are typical in this configuration, which drives efficiency up and power dissipation down. The device also offers a TTL/
CMOS compatible on/off enable function. The MSK5115 is packaged in a space efficient 5 pin power SIP available in two
styles with three lead bend options.
EQUIVALENT SCHEMATIC
PIN-OUT INFORMATION
TYPICAL APPLICATIONS
MSK5115-00
High Efficiency, High Current Linear Regulators
Constant Voltage/Current Regulators
System Power Supplies
Switching Power Supply Post Regulators
Battery Powered Equipment
1 ENABLE
2 VIN
3 GROUND
4 VOUT
5 ADJUST
CASE=ISOLATED
1
8548-37 Rev. K 8/15
ABSOLUTE MAXIMUM RATINGS
VINP
VIN
VEN
IOUT
Input Voltage (100mS 1%D.C.)
Input Voltage
Enable Voltage
Output Current
9
TST
TLD
-20V to +60V
26V
-0.3V to 26V
3.5A
TJ
Storage Temperature Range
Lead Temperature
(10 Seconds Soldering)
Operating Temperature
MSK 5115
MSK 5115B
ESD Rating
10
-65°C to +150°C
300°C
-40°C to +85°C
-55°C to +125°C
Class 1B
ELECTRICAL SPECIFICATIONS
NOTES:
1 Output decoupled to ground using 28µF 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 devices shall be tested to subgroup 1 unless otherwise specified.
5 Military grade devices ('B' suffix) shall be 100% tested to subgroups 1,2,3.
TC=+25°C
6 Subgroup 1
TJ=+125°C
Subgroup 2
TA=-55°C
Subgroup 3
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.
10 Internal solder reflow temperature is 180°C, do not exceed.
2
8548-37 Rev. K 8/15
APPLICATION NOTES
REGULATOR PROTECTION:
HEAT SINK SELECTION:
The MSK5115 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 MSK5115, the following formula for
convective heat flow may be used.
OUTPUT CAPACITOR:
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
Governing Equation:
Tj = Pd x (Rθjc + Rθcs + Rθsa) + Ta
The output voltage ripple of the MSK5115 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, 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
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 MSK5115 requires a minimum of 10mA of load current to stay
in regulation.
EXAMPLE:
An MSK5115 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 = 3.6°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 - 3.6°C/W - 0.15°C/W
1.7W
ENABLE PIN
The MSK 5115 of voltage regulator is 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.
= 55.07°C/W
In this example, a heat sink with a thermal resistance of no more
than 55°C/W must be used to maintain a junction temperature of
no more than 125°C.
DEVICE/CASE CONNECTION:
MSK5115-00 OUTPUT ADJUSTMENT:
The MSK5115 is a highly thermally conductive device, and the
thermal path from the package heat sink to the internal junction is
very short. Since the case is electrically isolated from the internal
circuitry, the package can be directly connected to a heat sink.
The diagram below illustrates proper adjustment technique for the
output voltage. The series resistance of R1+R2 should be selected
to pass the minimum regulator output current requirement of 10mA.
3
8548-37 Rev. K 8/15
TYPICAL PERFORMANCE CURVES
4
8548-37 Rev. K 8/15
MECHANICAL SPECIFICATIONS
ESD TRIANGLE INDICATES PIN 1
WEIGHT=7.7 GRAMS TYPICAL
ALL DIMENSIONS ARE SPECIFIED IN INCHES
ORDERING INFORMATION
MSK5115-00 B T U
LEAD CONFIGURATIONS
S= STRAIGHT; U= BENT UP; D= BENT DOWN
PACKAGE STYLE
T= TOP TAB
SCREENING
BLANK= INDUSTRIAL; B=MIL-PRF 38534 CLASS H
OUTPUT VOLTAGE
00=ADJ
GENERAL PART NUMBER
5
8548-37 Rev. K 8/15
MECHANICAL SPECIFICATIONS
ESD TRIANGLE INDICATES PIN 1
WEIGHT=8.1 GRAMS TYPICAL
ALL DIMENSIONS ARE SPECIFIED IN INCHES
ORDERING INFORMATION
MSK5115-00 B Z U
LEAD CONFIGURATIONS
S= STRAIGHT; U= BENT UP; D= BENT DOWN
PACKAGE STYLE
Z= Z PACK
SCREENING
BLANK= INDUSTRIAL; B=MIL-PRF 38534 CLASS H
OUTPUT VOLTAGE
00=ADJ
GENERAL PART NUMBER
6
8548-37 Rev. K 8/15
REVISION HISTORY
MSK
www.anaren.com/msk
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.
7
8548-37 Rev. K 8/15