MIL-PRF-38534 AND 38535 CERTIFIED FACILITY
HIGH CURRENT, LOW DROPOUT
SURFACE MOUNT
VOLTAGE REGULATORS
5215
SERIES
FEATURES:
Hermetic Surface Mount Package
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
On Board Thermal Shut Down
Reverse Battery and Load Dump Protection
Low Ground Current: 32mA Typical at Full Load
1% Maximum Guaranteed Accuracy
Output Current to 1.5 Amps
Alternate Output Voltages Available
DESCRIPTION:
The MSK5215 series voltage regulators are available in +1.5V, +1.7V, +1.8V, +1.9V, +2.5V, +3.3V, +5.0V, and +12.0V
output 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% maximum output voltage tolerance. The MSK5215 series
is packaged in a space efficient 3 pin power surface mount ceramic package.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
PIN-OUT INFORMATION
1 VIN
2 VOUT
3 GROUND
High Efficiency, High Current Linear Regulators
Constant Voltage/Current Regulators
System Power Supplies
Switching Power Supply Post Regulators
Battery Powered Equipment
LID=ISOLATED
1
8548-38 Rev. H 8/15
ABSOLUTE MAXIMUM RATINGS
VINP
VIN
VEN
IOUT
TST
TLD
-20V to +60V
26V
-0.3V to 26V
3.5A
Input Voltage (100mS 1%D.C.)
Input Voltage
Enable Voltage
Output Current
TJ
Storage Temperature Range
Lead Temperature
(10 Seconds Soldering)
Operating Temperature
MSK5251 Series
MSK5251H Series
ESD Rating
-65°C to +150°C
300°C
-40°C to +85°C
-55°C to +125°C
Class 1B
ELECTRICAL SPECIFICATIONS
Parameter
Test Conditions
1
Group A
Subgroup
3
MSK5215H SERIES
Min.
Typ.
Max.
MSK 5215 SERIES
Min.
Typ.
Max.
Units
1
-
±0.5
±1.0
-
±0.5
±1.0
%
2, 3
-
±1.0
±2.0
-
-
-
%
∆VOUT = -1%; IOUT = 100 mA
1
-
80
200
-
80
225
mV
∆VOUT = -1%; IOUT = 1.5A
1
-
350
600
-
350
625
mV
1
-
±0.2
±1.0
-
±0.2
±1.2
%
2, 3
-
±0.3
±2.0
-
±0.3
-
%
(VOUT +1V) ≤ VIN ≤ 26V
1
-
±0.05
±0.5
-
±0.05
±0.6
%
IOUT = 10 mA
2, 3
-
±0.5
±1.0
-
±0.5
-
%
VOUT = 0V; VIN = VOUT +1V
-
-
2.1
3.5
-
2.1
3.5
A
VIN = VOUT +1V; IOUT = 0.75A
-
-
18
30
-
18
30
mA
VIN = VOUT +1V; IOUT = 1.5A
-
-
32
-
-
32
-
mA
CL = 10µF; 10 HZ ≤ f ≤ 100 KHZ
-
-
400
-
-
400
-
µV
Thermal Resistance 2
Junction to Case @ 125°C
-
-
3.5
4.0
-
3.5
4.5
°C/W
Thermal Shutdown 2
TJ
-
-
130
-
-
130
-
°C
Output Voltage Tolerance
Dropout Voltage
2
Load Regulation 8
10 mA ≤ IOUT ≤ 1.25A
Line Regulation
Output Current Limit 2
Ground Current
IOUT = 10mA; VIN = VOUT +1V
2
Output Noise 2
PART 7
NUMBER
OUTPUT
VOLTAGE
MSK5215-1.5
+1.5V
MSK5215-1.7
+1.7V
MSK5215-1.8
+1.8V
MSK5215-1.9
+1.9V
MSK5215-2.5
+2.5V
NOTES:
MSK5215-3.3
+3.3V
1 Output decoupled to ground using 33µF minimum capacitor unless otherwise specified.
2 Guaranteed by design but no 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 ('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 current limit, maximum output current may not be available at all values of VIN-VOUT and temperatures.
See typical performance curves for clarification.
MSK5215-5.0
+5.0V
MSK5215-12
+12.0V
2
8548-38 Rev. H 8/15
APPLICATION NOTES
REGULATOR PROTECTION:
PACKAGE CONNECTIONS:
The MSK5215 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.
The MSK5215 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.
OUTPUT CAPACITOR:
HEAT SINK SELECTION:
The output voltage ripple of the MSK5215 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
33µF is recommended for optimum performance. Transient
load response can also be improved by placing a capacitor
directly across the load. The capacitor should not be an
ultra-low ESR type. Tantalum capacitors are best for fast
load transients but aluminum electrolytics will work fine in
most applications.
To select a heat sink for the MSK5215, 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
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.
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).
MINIMIZING POWER DISSIPATION:
Many applications can not take full advantage of the extremely low dropout specifications of the regulator due to
large input to output voltage differences. The simple circuit
below illustrates a method to reduce the input voltage at the
regulator to just over the dropout specification to keep the
internal power dissipation minimized:
EXAMPLE:
An MSK5215-3.3 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 = 3.5°C/W and Rθcs = 0.5°C/W typically.
Power Dissipation = (5V - 3.3V) x (1A)
= 1.7 Watts
Solve for Rθsa:
[
Rθsa = 125°C - 25°C
1.7W
= 54.82°C/W
For a given continuous maximum load of 1 amp, R1 can be
selected to drop the voltage seen at the regulator to 4V. This
allows for the output tolerance and dropout specifications.
Input voltage variations (5V) also should be included in the
calculations. The resistor should be sized according to the
power levels required for the application.
] - 3.5°C/W - 0.5°C/W
In this example, a heat sink with a thermal resistance of
no more than 54°C/W must be used to maintain a junction
temperature of no more than 125°C.
3
8548-38 Rev. H 8/15
TYPICAL PERFORMANCE CURVES
4
8548-38 Rev. H 8/15
MECHANICAL SPECIFICATIONS
ALL DIMENSIONS ARE SPECIFIED IN INCHES
WEIGHT=2.3 GRAMS TYPICAL
ORDERING INFORMATION
MSK5215-3.3 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
8548-38 Rev. H 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.
6
8548-38 Rev. H 8/15