ISO-9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP.
FEATURES:
HIGH CURRENT,
LOW DROPOUT
VOLTAGE REGULATORS
5101
SERIES
(315) 701-6751
4707 Dey Road Liverpool, N.Y. 13088
Extremely Compact 10 Pin Flatpack With Metal Base
Extremely Low Dropout Voltage: 350mV @ 1.5 Amps
Available in 3.3V, 5.0V, 12.0V and Adjustable Versions
Open Collector Error Flag Output Available on Fixed Voltage Versions
TTL Level Enable Pin: Zero Current Shutdown Mode
Reverse Battery and Load Dump Protection
Low Ground Current: 22mA Typical at Full Load
1% Guaranteed Accuracy
Output Current to 1.5 Amps
MIL-PRF-38534 CERTIFIED
DESCRIPTION:
The MSK 5101 series voltage regulators are available in +3.3V, +5.0V, +12.0V or adjustable 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% output voltage tolerance. The series also offers a TTL/CMOS
compatible on/off enable function as well as an output flag pin on the fixed voltage versions. The MSK 5101 series is
packaged in a space efficient 10 pin ceramic flatpack with a built in metal base.
EQUIVALENT SCHEMATIC
Schematic shown for fixed output voltage versions
TYPICAL APPLICATIONS
High Efficiency, High Current Linear Regulators
Constant Voltage/Current Regulators
System Power Supplies
Switching Power Supply Post Regulators
Battery Powered Equipment
1
2
3
4
5
6
7
8
9
10
PIN-OUT INFORMATION
MSK5101-00
NC
Enable
Vin A
Vin B
NC
Vout A
Vout B
NC
Adj
NC
MSK5101-3.3,-5.0,-12
1
2
3
4
5
6
7
8
9
10
NC
Enable
Vin A
Vin B
NC
Vout A
Vout B
Vout C
NC
Flag
BASE
The base of the package is electrically
connected to ground.
1
Rev. E 1/05
ABSOLUTE MAXIMUM RATINGS
V
INP
V
IN
V
EN
I
OUT
10
T
J
-40°C to +85°C
-55°C to +125°C
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ELECTRICAL SPECIFICATIONS
Parameter
Test Conditions
1 3
Group A MSK 5101H/E SERIES
Subgroup
1
Min.
-
-
-
-
-
-
-
-
-
-
-
-
2.4
-
-
-
-
-
-
-
1.22
-
-
-
-
Typ.
±0.5
±1.0
80
350
±0.2
±0.3
±0.05
±0.5
2.1
8
22
400
-
-
20
1
10
0.01
0.2
75
1.24
20
40
5.6
135
Max.
±1.0
±2.0
200
600
±1.0
±2.0
±0.5
±1.0
3.5
20
-
-
-
0.8
75
2
20
2
0.4
-
1.26
-
120
6.0
-
MSK 5101 SERIES
Min.
-
-
-
-
-
-
-
-
-
-
-
-
2.4
-
-
-
-
-
-
-
1.22
-
-
-
-
Typ.
±0.5
-
80
350
±0.2
±0.3
±0.05
±0.5
2.1
8
22
400
-
-
20
1
10
0.01
0.2
75
1.24
20
40
5.6
135
Max.
±1.0
-
225
625
±1.2
-
±0.6
-
3.5
20
-
-
-
0.8
75
2
20
2
0.4
-
1.26
-
150
7
-
Units
%
%
mV
mV
%
%
%
%
A
mA
mA
µV
V
V
µA
µA
µA
µA
V
mV
V
ppm/°C
nA
°C/W
°C
Output Voltage Tolerance
I
OUT
=10mA; V
IN
=V
OUT
+1V
2,3
∆V
OUT
=-1%; I
OUT
=100m
A
∆V
OUT
=-1%; I
OUT
=1.5A
V
IN
=V
OUT
+1V
10mA
≤
I
OUT
≤
1.25A
(V
OUT
+1V)
≤
V
IN
≤
26V
I
OUT
=10mA
1
1
1
2,3
1
2,3
-
-
-
-
1
1
1
1
-
-
1
-
1
-
-
-
-
Dropout Voltage
2
Load Regulation
9
Line Regulation
Output Current Limit
2
Ground Current
Output Noise
2
2
V
OUT
=0V; V
IN
=V
OUT
+1V
V
IN
=V
OUT
+1V; I
OUT
=0.75A
V
IN
=V
OUT
+1V; I
OUT
=1.5A
C
L
=10µF; 10Hz
≤
f
≤
100KHz
HIGH/ON
LOW/OFF
Enable Input Voltage
2
Enable Input Current
2
Shutdown Output Current
2
Flag Output Leakage
2 8
Flag Output On Voltage
8
Flag Threshold
2 8
HIGH/ON
LOW/OFF
V
ENABLE
≤
0.8V
V
OH
=26V
I
OL
≤
250µA; V
IN
=V
OUT
-2V
V
IN
=V
OUT
-7%
Normal Operation
Normal Operation
Full Temp; V
IN
=V
OUT
+1V
Junction to Case @ 125°C
T
J
Reference Voltage
7
Reference Voltage Temp Drift
2 7
Adjust Pin Bias Current
2 7
Thermal Resistance
Thermal Shutdown
2
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 and class E 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
Subgroup 2
T
J
=+125°C
Subgroup 3
T
A
=-55°C
7 Applies to MSK5101-00 adjustable version only.
8 Applies to fixed output devices only.
9 Due to current limit, maximum output current may not be available at all values of V
IN
-V
OUT
and
temperatures. See typical performance curves for clarification.
10 Continuous operation at or above absolute maximum ratings may adversly effect the device
performance and/or life cycle.
PART
NUMBER
MSK5101-00
MSK5101-3.3
MSK5101-5.0
MSK5101-12
OUTPUT
VOLTAGE
Adjustable
+3.3V
+5.0V
+12.0V
2
Rev. E
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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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T
ST
T
LD
Storage Temperature Range
Lead Temperature
(10 Seconds Soldering)
Operating Temperature
MSK5101 Series
MSK5101H/E Series
-65°C to +150°C
300°C
1/05
APPLICATION NOTES
REGULATOR PROTECTION:
The MSK 5101 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 MSK 5100, 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 MSK 5101 series voltage regu-
lators 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
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 MSK 5101 series requires a mini-
mum of 10mA of load current to stay in regulation.
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 MSK 5101-3.3 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 tem-
perature 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 MSK 5101 series of voltage regulators are equipped with a
TTL compatible ENABLE pin. A TTL high level on this pin acti-
vates 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 only 5µA of quiescent current. If the
enable function is not used, simply connect the enable pin to
the input.
FLAG OUTPUT PIN:
All of the fixed output voltage versions of the MSK 5101 series
are equipped with a flag output pin. Since the flag pin is an
open collector configuration it can be pulled up to any voltage
between 3V and 26V. This feature allows direct interfacing to
practically any logic. This active low output has a typical level
of 0.22V when the flag comparator detects an "out of regula-
tion" condition. Flag states include low input voltage and
output current limit. Extremely high level input voltage tran-
sients will also cause the flag output pin to activate.
DEVICE SOLDERING/CASE CONNECTION:
MSK5101-00 OUTPUT ADJUSTMENT:
The MSK 5101-00 is an adjustable version in the series of high
performance regulators. The diagram below illustrates proper
adjustment technique for the output voltage. The series resis-
tance of R1+R2 should be selected to pass the minimum regu-
lator output current requirement of 10mA.
The MSK 5101 series are highly thermally conductive devices
and the thermal path from the package base to the internal junc-
tions 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 MSK 5101 is also electrically connected to
ground. The user is urged to keep this in mind when designing
the printed circuit board for the MSK 5101. 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
Rev. E
1/05
MECHANICAL SPECIFICATIONS
WEIGHT= 0.3 GRAMS TYPICAL
NOTE: ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED.
ESD Triangle indicates Pin 1.
ORDERING INFORMATION
MSK5101-3.3 H
SCREENING
BLANK=INDUSTRIAL, E=EXTENDED RELIABILITY;
H=CLASS H
OUTPUT VOLTAGE
00=Adjustable; 3.3=+3.3V; 5.0=+5.0V; 12=+12.0V
GENERAL PART NUMBER
The above example is a +3.3V, Military regulator.
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.
5
Rev. E
1/05
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