MIL-PRF-38534 AND 38535 CERTIFIED FACILITY
HIGH CURRENT,
LOW DROPOUT
VOLTAGE REGULATORS
FEATURES:
Extremely Compact 10 Pin Flatpack With Metal Base
Extremely Low Dropout Voltage: 350mV @ 1.5 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: 32mA Typical at Full Load
1% Guaranteed Accuracy
Output Current to 1.5 Amps
5102
SERIES
DESCRIPTION:
The MSK5102 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 1.5 amps are typical in this configuration, which drives efficiency up
and power dissipation down. Accuracy is guaranteed with a 1% output voltage tolerance. The series also offers a TTL/CMOS
compatible on/off enable function. The MSK5102 series is packaged in a space efficient 10 pin ceramic flatpack with a built
in metal base.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
High Efficiency, High Current Linear Regulators
Constant Voltage/Current Regulators
System Power Supplies
Switching Power Supply Post Regulators
Battery Powered Equipment
PIN-OUT INFORMATION
1
2
3
4
5
6
7
8
9
10
NC
ENABLE
VIN A
VIN B
NC
VOUT A
VOUT B
VOUT C
NC
NC
BASE
The base of the package is electrically
connected to ground.
8548-36 Rev. D 5/15
1
ABSOLUTE MAXIMUM RATINGS
VIN
P
VIN
V
EN
I
OUT
VIN Pulse (100mS max,1% Duty)
Input Voltage
Enable Voltage
Output Current
9
-20V to +60V
26V
-0.3V to 26V
3.5A
T
ST
T
LD
T
J
Storage Temperature Range
Lead Temperature
(10 Seconds Soldering)
Operating Temperature
MSK5102 Series
MSK5102H Series
-65°C to +150°C
300°C
-40°C to +85°C
-55°C to +125°C
ELECTRICAL SPECIFICATIONS
MSK5102H SERIES
Typ.
±0.5
±1.0
80
350
±0.2
±0.3
±0.05
±0.5
2.1
18
32
400
-
-
100
-
10
5.6
135
-
-
-
-
-
-
-
-
-
-
-
-
2.4
-
-
-
-
-
-
Parameter
Output Voltage Tolerance
Dropout Voltage
Load Regulation
Line Regulation
Output Current Limit
Ground Current
Output Noise
2
2
2
2
Test Conditions
1 3
I
OUT
=10mA; VIN=VOUT+1V
∆VOUT=-1%;
I
OUT
=100m
A
∆VOUT=-1%;
I
OUT
=1.5A
VIN=VOUT+1V
10mA
≤
I
OUT
≤
1.25A
(VOUT +1V)
≤
VIN
≤
26V
I
OUT
=10mA
VOUT=0V; VIN=VOUT+1V
VIN=VOUT+1V; I
OUT
=0.75A
VIN=VOUT+1V; I
OUT
=1.5A
C
L
=10µF; 10Hz
≤
f
≤
100KHz
HIGH/ON
LOW/OFF
HIGH/ON
LOW/OFF
2
Group A
1
2,3
1
1
1
2,3
1
2,3
-
-
-
-
1
1
1
1
-
-
-
MSK 5102 SERIES
Typ.
±0.5
-
80
350
±0.2
±0.3
±0.05
±0.5
2.1
18
32
400
-
-
100
-
10
5.6
135
Max.
±1.0
-
225
625
±1.2
-
±0.6
-
3.5
30
-
-
-
0.8
600
2
500
7
-
Units
%
%
mV
mV
%
%
%
%
A
mA
mA
µV
V
V
µA
µA
µA
°C/W
°C
-
-
-
-
-
-
-
-
-
-
-
-
2.4
-
-
-
-
-
-
Subgroup Min.
Max. Min.
±1.0
±2.0
200
600
±1.0
±2.0
±0.5
±1.0
3.5
30
-
-
-
0.8
600
2
500
6
-
2
8
Enable Input Voltage
Enable Input Current
2
Shutdown Output Current
Thermal Resistance
Thermal Shutdown
2
V
ENABLE
≤
0.8V
Junction to Case @ 125°C
T
J
NOTES:
1
Output decoupled to ground using 10µF minimum capacitor 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 T
J
= T
C
.
4
Industrial grade devices shall be tested to subgroups 1 and 4 unless otherwise specified.
5
Military grade devices ('H' suffix) shall be 100% tested to subgroups 1,2,3 and 4.
T
C
=+25°C
6 Subgroup 1,4
T
J
=+125°C
Subgroup 2
T
A
=-55°C
Subgroup 3
7
Please consult factory if alternate output voltages are desired.
8
Due to current limit, maximum output current may not be available at all values of V
IN
-V
OUT
and temperatures. See typical perfor-
mance curves for clarification.
9
Continuous operation at or above absolute maximum ratings may adversely effect the device performance and/or life cycle.
2
8548-36 Rev. D 5/15
APPLICATION NOTES
REGULATOR PROTECTION:
The MSK5102 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.
HEAT SINK SELECTION:
To select a heat sink for the MSK5102, the following formula for
convective heat flow may be used.
Governing Equation:
Tj = Pd x (R
θ
jc + R
θ
cs + R
θ
sa) + Ta
WHERE:
Tj = Junction Temperature
Pd = Total Power Dissipation
R
θ
jc = Junction to Case Thermal Resistance
R
θ
cs = Case to Heat Sink Thermal Resistance
R
θ
sa = Heat Sink to Ambient Thermal Resistance
Ta = Ambient Temperature
OUTPUT CAPACITOR:
The output voltage ripple of the MSK5102 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. Transient load response can also be
improved by placing a capacitor directly across the load.
LOAD CONNECTIONS:
In voltage regulator applications where very large load currents
are present, the load connection is very important. The path con-
necting 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.
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
maximum allowable junction temperature is 125°C. The equation
may now be rearranged to solve for the required heat sink to ambient
thermal resistance (R
θ
sa).
EXAMPLE:
An MSK5102-3.3 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.
R
θ
jc = 6°C/W and R
θ
cs = 0.5°C/W typically.
Power Dissipation = (5V - 3.3V) x (1A)
= 1.7 Watts
Solve for R
θ
sa:
R
θ
sa = 125°C - 25°C - 6°C/W - 0.5°C/W
1.7W
= 52.3°C/W
In this example, a heat sink with a thermal resistance of no more
than 52°C/W must be used to maintain a junction temperature of
no more than 125°C.
ENABLE PIN:
The MSK5102 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.
DEVICE SOLDERING/CASE CONNECTION:
The MSK5102 series are highly thermally conductive devices and
the thermal path from the package base to the internal junctions
is very short. Standard surface mount techniques should be used
when soldering the device into a circuit board. The external heat
sink/pad needs to be connected to ground because the base of
the MSK5102 is also electrically connected to ground. The user is
urged to keep this in mind when designing the printed circuit board
for the MSK5102. There should be no printed circuit traces making
contact with the base of the device except for ground. The ground
plane can be used to pull heat away from the device.
3
8548-36 Rev. D 5/15
TYPICAL PERFORMANCE CURVES
4
8548-36 Rev. D 5/15
MECHANICAL SPECIFICATIONS
ESD TRIANGLE INDICATES PIN 1
WEIGHT=0.3 GRAMS TYPICAL
ALL DIMENSIONS ARE SPECIFIED IN INCHES
ORDERING INFORMATION
MSK5102-3.3 H
SCREENING
BLANK=INDUSTRIAL; 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.
5
8548-36 Rev. D 5/15
