ISO-9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP.
HIGH CURRENT,
SUPER LOW DROPOUT
FIXED VOLTAGE REGULATORS
5010
SERIES
4707 Dey Road Liverpool, N.Y. 13088
(315) 701-6751
MIL-PRF-38534 QUALIFIED
FEATURES:
Extremely Low Dropout Voltage 0.45V @ 10 Amps
Available in 3.3V, 5.0V and 12.0V versions
Output Voltages Are Internally Set to ±1.5% maximum
TTL Level Enable Pin
Electrically Isolated Case
Low Quiescent Current
Output Current to 10 Amps
Available in Two Package Styles
Available with Three Lead Form Options
DESCRIPTION:
The MSK 5010 series voltage regulators are available in a +3.3V, +5.0V or +12.0V fixed output configuration.
All three boast ultra low dropout specifications due to the utilization of a MOSFET output pass transistor with
extremely low Rds(on). Dropout voltages of 0.45V at 10 amps are typical, in this configuration, which drives
efficiency up and power dissipation down. Accuracy is guaranteed with a 1.5% maximum initial output voltage
tolerance that varies only ±2% with temperature. The MSK 5010 series is packaged in a space efficient 5 pin SIP
that is electrically isolated from the internal circuitry allowing direct heat sinking for maximum heat dissipation.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
High Efficiency, High Current Linear Regulators
Constant Voltage/Current Regulators
System Power Supplies
Switching Power Supply Post Regulators
1
Rev. H 10/02
ABSOLUTE MAXIMUM RATINGS
VIN
VEN
IOUT
TJ
Input Voltage
Enable Voltage
Output Current
Junction Temperature
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TST
TLD
36V
-0.3V to 36V
10A within SOA
+175°C
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TC
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Storage Temperature Range -65°C to +150°C
Lead Temperature Range
300°C
(10 Seconds)
Case Operating Temperature
MSK5010 Series
-40°C to +85°C
MSK5010B/E Series
-55°C to +125°C
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ELECTRICAL SPECIFICATIONS
Group A MSK 5010B/E SERIES
Test Conditions 3
Parameter
Output Voltage Tolerance
IOUT=100mA; VIN=VOUT+3V
MSK 5010 SERIES
Subgroup
Min.
Typ.
Max.
Min.
Typ.
Max. Units
1
-
±0.3
±1.5
-
±0.5
±1.5
%
2,3
-
±1.0
±2.0
-
-
-
%
IOUT= 0A
1
-
0.002
0.010
-
0.002
0.015
V
IOUT=10A
1
-
0.45
0.75
-
0.5
1.0
V
Load Regulation
VIN=VOUT+3V
1
-
±0.5
±1.0
-
±0.5
±1.5
%
100mA ≤ IOUT ≤ 9A
2,3
-
±0.5
±2.0
-
-
-
%
Line Regulation
(VOUT +1.5V) ≤ VIN ≤ (VOUT+15V)
1
-
±0.3
±1.0
-
±0.5
±1.5
%
IOUT=100mA
2,3
-
±0.5
±1.0
-
-
-
%
VEN=VIN; VIN=VOUT+3V; IOUT=0A
1,2,3
-
4.5
10
-
4.5
10
mA
2 VEN=0V; VIN=VOUT+3V; IOUT=0A
Dropout Voltage 2
Quiescent Current
Ripple Rejection 2
Thermal Resistance
2
1,2,3
-
0.15
5.0
-
0.15
5.0
µA
f=120Hz
-
-
45
-
-
45
-
dB
Junction to Case
-
-
0.7
0.8
-
0.7
1.0
°C/W
HIGH
1
2.4
1.2
-
2.4
1.2
-
V
LOW
1
-
1.2
0.8
-
1.2
0.8
V
HIGH
1
-
12.5
50
-
20
50
µA
LOW
1
-
0.8
25
-
10
25
µA
-
-
5
-
-
5
-
µS
Enable Input Voltage 2
Enable Input Current 2
Output Settling Time 2
8
To within 10mV
NOTES:
1 Output decoupled to ground using 47µF minimum capacitor unless otherwise specified.
2 Guaranteed by design but not 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 and "E" suffix 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.
6 Subgroup 1
TA=TC=+25°C
Subgroup 2
TA=TC=+125°C
Subgroup 3
TA=TC= -55°C
7 Please consult the factory if alternate output voltages are required.
8 After application of enable pulse
2
PART 7 OUTPUT
NUMBER VOLTAGE
MSK5010-3.3
+3.3V
MSK5010-5.0
+5.0V
MSK5010-12
+12.0V
Rev. H 10/02
APPLICATION NOTES
MINIMIZING OUTPUT RIPPLE:
HEAT SINK SELECTION:
The output voltage ripple of the MSK 5010 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 and is best determined by
experimentation. Transient load response can also be improved
by placing a (10uF to 20uF) capacitor directly across the load.
To select a heat sink for the MSK 5010, the following formula
for convective heat flow must 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
CASE CONNECTIONS:
The case of the MSK 5010 is electrically isolated from the
internal circuitry so that a direct connection can be made to
the heat sink for most efficient heat dissipation. However, it
may be necessary in some applications to connect the case
to ground. Grounding the case will help eliminate oscillations
and produce a clean, noise free output.
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 175°C.
The equation may now be rearranged to solve for the required
heat sink to ambient thermal resistance (Rθsa).
LOAD REGULATION:
For best results, the ground pin should be connected directly to
the load (see next note). This effectively reduces the ground
loop effect and eliminates excessive voltage drop in the sense
leg. It is also important to keep the output connection between the regulator and the load as short as possible since this
directly affects the load regulation. For example, if 20 gauge
wire were used which has a resistance of about .008 ohms per
foot, this would result in a drop of 8mV/ft at a load current of
1 amp.
EXAMPLE;
An MSK 5010-3.3 is configured for Vin = +7V and Vout =
+3.3V. Iout is a continuous 10A DC level. The ambient temperature is +25°C. The maximum desired junction temperature is 150°C. Rθjc = 0.8°C/W and Rθcs = 0.15°C/W typically.
Power Dissipation = (7V - 3.3V) x (10A)
= 37 Watts
Solve for Rθsa:
Rθsa = 150°C - 25°C - 0.8°C/W - 0.15°C/W
37W
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 same holds true for
the connection from the low end of the load to ground. For
best load regulation, the low end of the load must be connected directly to pin 2 of the MSK 5010 and not to a
ground plane inches away from the hybrid.
In this example, a heat sink with a thermal resistance of no
more than 2.43°C/W must be used to maintain a junction temperature of no more than 150°C. The Thermalloy Corporation
makes a heat sink with a thermal resistance of 2.2°C/W that
would work well for this application.
(See Thermalloy part number 7023)
POWER DISSIPATION:
The output pass transistor in the MSK 5010 is rated to
dissipate nearly 100 watts. The limiting factor of this device
is effective dissipation of heat generated under such conditions. For example, to dissipate 100 watts, calculations
show that the MSK 5010 would have to be bolted to the
underbelly of a submarine submerged in the Arctic Ocean!
Careful consideration must be paid to heat dissipation and
junction temperature when applying this device.
ENABLE/SHUTDOWN PIN:
The MSK 5010 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 a maximum of 5µA of quiescent
current.
CHARGE CAPACITOR:
For all applications, the user must connect a 1.0uF capacitor
from pin 5 directly to ground. This capacitor is part of the
circuit which drives the gate of the internal MOSFET.
Approximately three times the voltage seen on the input will
appear across this capacitor. Careful attention must be paid
to capacitor voltage rating since voltages larger than the
power supply are present.
3
Rev. H 10/02
TYPICAL PERFORMANCE CURVES
4
Rev. H 10/02
MECHANICAL SPECIFICATIONS
TOP TAB
Z- TAB
NOTE: ESD Triangle indicates Pin 1.
ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED
MSK5010-3.3 B T U
ORDERING INFORMATION
LEAD CONFIGURATIONS
S= STRAIGHT; U= BENT UP; D= BENT DOWN
PACKAGE STYLE
T= TOP TAB; Z= Z PACK
SCREENING
BLANK=INDUSTRIAL; E=EXTENDED RELIABILITY
B=MIL-PRF-38534 CLASS H
OUTPUT VOLTAGE
3.3=+3.3V; 5=+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.
Please visit our website for the most recent revision of this datasheet.
5
Rev. H 10/02