ISO-9001 CERTIFIED BY DSCC
5175
VERY HIGH CURRENT,
LOW DROPOUT
VOLTAGE REGULATORS
M.S.KENNEDY CORP.
SERIES
4707 Dey Road Liverpool, N.Y. 13088
(315) 701-6751
FEATURES:
MIL-PRF-38534 QUALIFIED
Electrically Isolated Top Tab or Z Tab SIP
Extremely Low Dropout Voltage: 425mV @ 7.5 Amps
Available in 3.3V, 5.0V, 12.0V and Adjustable Versions
Open Collector Error Flag Output
TTL Level Enable Pin: Zero Current Shutdown Mode
Reverse Battery and Load Dump Protection
Low Ground Current: 120mA Typical at Full Load
1% Maximum Guaranteed Accuracy
Output Current to 7.5 Amps
DESCRIPTION:
The MSK 5175 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 425mV at 7.5 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 series also offers a TTL/CMOS compatible on/off enable function as well as an output flag pin. The MSK 5175
series is packaged in a space efficient 5 pin power SIP available in two styles with three lead bend options.
EQUIVALENT SCHEMATIC
Schematic shown for fixed output voltage versions
TYPICAL APPLICATIONS
PIN-OUT INFORMATION
MSK5175-00
High Efficiency, Ultra High Current Linear Regulators
Constant Voltage/Current Regulators
System Power Supplies
Switching Power Supply Post Regulators
Battery Powered Equipment
1
2
3
4
5
1
Enable
Vin
Ground
Vout
Adjust
MSK5175-3.3,-5.0,-12
1
2
3
4
5
Enable
Vin
Ground
Vout
Flag
Rev. C 7/00
ABSOLUTE MAXIMUM RATINGS
VINP
VIN
VEN
IOUT
TST
TLD
Input Voltage (100mS 1%D.C.) -20V to +60V
Input Voltage
26V
Enable Voltage
-0.3V to 26V
Output Current
8A
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TJ
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Storage Temperature Range -65°C to +150°C
Lead Temperature
300°C
(10 Seconds Soldering)
Operating Temperature
MSK 5175 Series
-40°C to +85°C
MSK 5175B Series
-55°C to +125°C
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ELECTRICAL SPECIFICATIONS
Test Conditions 1 3
Parameter
Output Voltage Tolerance
Dropout Voltage
IOUT=10mA; VIN=VOUT+1V
±0.5
±1.0
-
±0.5
±1.0
%
-
-
%
-
80
225
mV
2
∆VOUT=-1%; IOUT=7.5A
1
-
425
600
-
425
625
mV
VIN=VOUT+5V
1
-
±0.2
±1.0
-
±0.2
±1.2
%
10mA ≤ IOUT ≤ 7.5A
2,3
-
±0.3
±2.0
-
±0.3
-
%
(VOUT +1V) ≤ VIN ≤ 26V
1
-
±0.05
±0.5
-
±0.05
±0.6
%
IOUT=10mA
2,3
-
±0.5
±1.0
-
±0.5
-
%
VOUT=0V; VIN=VOUT+1V
-
-
9.5
15
-
9.5
15
A
VIN=VOUT+1V; IOUT=4A
-
-
35
75
-
35
80
mA
VIN=VOUT+1V; IOUT=7.5A
-
-
120
-
-
120
-
mA
9
9
Reference Voltage 8
Reference Voltage Temp Drift 2 8
Thermal Shutdown 2
-
2,3
-
-
-
260
-
-
260
-
µV
HIGH/ON
1
2.4
1.2
-
2.4
1.2
-
V
LOW/OFF
1
-
1.2
0.8
-
1.2
0.8
V
HIGH/ON
1
-
20
75
-
20
75
µA
LOW/OFF
1
-
1
2
-
1
2
µA
VENABLE ≤ 0.8V
-
-
10
20
-
10
20
µA
VOH=26V
-
-
0.01
2
-
0.01
2
µA
IOL ≤ 250µA; VIN=VOUT-2V
1
-
0.2
0.4
-
0.2
0.4
V
VIN=VOUT-7%
-
-
75
-
-
75
-
mV
Normal Operation
1
1.22
1.24
1.26
1.22
1.24
1.26
V
Normal Operation
-
-
20
-
-
20
-
ppm/°C
Full Temp; VIN=VOUT+1V
-
-
40
120
-
40
150
nA
Junction to Case
-
-
0.9
1.3
-
0.9
1.5
°C/W
TJ
-
-
135
-
-
135
-
°C
2
2
Units
200
Flag Output On Voltage 9
Thermal Resistance
Max.
±2.0
2
Adjust Pin Bias Current 2 8
Typ.
80
CL=33µF; 10Hz ≤ f ≤ 100KHz
2
Min.
±1.0
Shutdown Output Current 2
Flag Threshold
Max.
-
2
Flag Output Leakage 2
Typ.
-
2
Enable Input Current
Min.
1
1
Output Current Limit 2
Enable Input Voltage
Subgroup
MSK 5175 SERIES
∆VOUT=-1%; IOUT=250m A
Line Regulation
Output Noise
MSK 5175B SERIES
2
Load Regulation
Ground Current
Group A
NOTES:
1 Output decoupled to ground using 33µF 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 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 and 3.
TC=+25°C
6 Subgroup 1
Subgroup 2
TJ=+125°C
Subgroup 3
TA=-55°C
7 Please consult the factory if alternate output voltages are required.
8 Applies to MSK5175-00 adjustable version only.
9 Applies to fixed output devices only.
2
PART
NUMBER
OUTPUT
VOLTAGE
MSK5175-00
Adjustable
MSK5175-3.3
+3.3V
MSK5175-5.0
+5.0V
MSK5175-12
+12.0V
Rev. C 7/00
APPLICATION NOTES
REGULATOR PROTECTION:
HEAT SINK SELECTION:
The MSK 5175 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.
To select a heat sink for the MSK 5175, 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
OUTPUT CAPACITOR:
The output voltage ripple of the MSK 5175 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.
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 MSK 5175 series requires a minimum of 10mA of load current to stay in regulation.
EXAMPLE;
An MSK 5175-3.3 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 = 1.3°C/W and Rθcs = 0.5°C/W typically.
Power Dissipation = (5V - 3.3V) x (1A)
= 1.7 Watts
Solve for Rθsa:
125°C - 25°C
- 1.3°C/W - 0.5°C/W
Rθsa =
1.7W
ENABLE PIN:
The MSK 5175 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 only 5µA of quiescent current. If the
enable function is not used, simply connect the enable pin to
the input.
= 57.02°C/W
In this example, a heat sink with a thermal resistance of no
more than 57°C/W must be used to maintain a junction temperature of no more than 125°C.
FLAG OUTPUT PIN:
MSK5175-00 OUTPUT ADJUSTMENT:
All of the fixed output voltage versions of the MSK 5175 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 regulation" condition. Flag states include low input voltage, out of
regulation and output current limit. Extremely high level input
voltage transients will also cause the flag output pin to activate.
The MSK 5175-00 is an adjustable version in the series of high
performance regulators. The diagram below illustrates proper
adjustment technique for the output voltage. The series resistance of R1+R2 should be selected to pass the minimum regulator output current requirement of 10mA.
DEVICE/CASE CONNECTION:
The MSK 5175 series are highly thermally conductive devices
and the thermal path from the package heat sink to the internal
junctions is very short. Since the case is electrically isolated
from the internal circuitry, the package can be directly connected to a heat sink.
3
Rev. C 7/00
TYPICAL PERFORMANCE CURVES
4
Rev. C 7/00
MECHANICAL SPECIFICATIONS
NOTE: ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED.
ESD Triangle indicates Pin 1.
ORDERING INFORMATION
MSK5175-3.3 B T U
LEAD CONFIGURATIONS
S= STRAIGHT; U= BENT UP; D= BENT DOWN
PACKAGE STYLE
T= TOP TAB; Z= Z PACK
SCREENING
BLANK= INDUSTRIAL; B= MIL-PRF-38534
OUTPUT VOLTAGE
00=ADJ; 3.3=+3.3V; 5.0=+5.0V; 12=+12.0V
GENERAL PART NUMBER
The above example is a +3.3V, Military regulator using the top tab package with
leads bent up.
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.
5
Rev. C 7/00