ISO-9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP.
FEATURES:
DUAL OUTPUT
RADIATION HARDENED
HIGH EFFICIENCY, 9 AMP
SWITCHING REGULATORS
5047RH
SERIES
(315) 701-6751
4707 Dey Road Liverpool, N.Y. 13088
Up To 85% Efficiency
9 Amp Total Output Current
4.5V to 16V Input Range with Startup Bias
4.5V to 5.5V Input Range with VBias=V
IN
Preset 3.3V/2.5V, 3.3V/1.5V or 2.5/1.5V Output Voltage Combinations
Custom Output Voltages Available
300KHz Switching Frequency
Hermetic Package with Three Lead Form Options
-55°C to +125°C Operating Temperature Range
100K RAD Total Dose Rated
MIL-PRF-38534 CERTIFIED
DESCRIPTION:
The MSK5047RH series are high efficiency, 9 amp, radiation hardened switching regulators. The output voltages are
configured for 3.3V/2.5V, 3.3V/1.5V or 2.5V/1.5V internally with a tolerance of 1% at 4.0 amps. The operating
frequency of the MSK5047RH is 300KHz. A low quiescent current and greater than 80% operating efficiency keep the
total internal power dissipation of the MSK5047RH down to an absolute minimum. The device is packaged in a
hermetic power package for high reliability applications, and is available fully screened to MIL-PRF-38534 Class H or K.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
TYPICAL APPLICATIONS
Step-down Switching Regulator
Microprocessor, FPGA Power Source
High Efficiency Low Voltage
Subsystem Power Supply
1
2
3
4
5
6
7
8
9
10
1
PIN-OUT INFORMATION
VIN
VIN
VIN
VIN
VIN
VIN
VBIAS
CAP
ENABLE
CASE GND
20
19
18
17
16
15
14
13
12
11
VOUT MAIN
VOUT MAIN
VOUT MAIN
RETURN
RETURN
RETURN
RETURN
VOUT AUX
VOUT AUX
VOUT AUX
PRELIMINARY Rev. - 7/04
ABSOLUTE MAXIMUM RATINGS
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T
C
ELECTRICAL SPECIFICATIONS
NOTES:
1
2
3
4
5
6
V
Bias
=VIN=5.0V, I
OUT
=4.0A, CIN=100µF, COUT=200µF each output unless otherwise specified.
Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only.
All output parameters are tested using a low duty cycle pulse to maintain T
J
= T
C
.
Industrial grade and 'E' suffix devices shall be tested to subgroup 1 unless otherwise specified.
Military grade devices ('H' and 'K' suffix) shall be 100% tested to subgroups 1,2 and 3.
Subgroup 1 T
A
=T
C
=+25°C
Subgroup 2 T
A
=T
C
=+125°C
Subgroup 3 T
A
=T
C
=-55°C
7 Alternate output voltages are available. Please contact the factory.
2
PRELIMINARY Rev. - 7/04
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T
J
-40°C to +85°C
-55°C to +125°C
+150°C
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Input Voltage
Bias Voltage
Enable
Output Current
Thermal Resistance (@ 125°C)
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-0.3V, +16V
-0.3V, +5.5V
-0.3V, 10.5V
9.0 Amps Total
9.0°C/W
T
ST
T
LD
Storage Temperature Range
Lead Temperature Range
(10 Seconds)
Case Operating Temperature
MSK5047RH Series
MSK5047RH K/H/E Series
Junction Temperature
-65°C to +150°C
300°C
APPLICATION NOTES
INPUT VBIAS:
The VBias pin of the MSK5047RH provides bias to the
control circuitry for intial startup only. The Vbias pin can
be connected directly to the input bus for 4.5V to 5.5V
operation or it can be biased separately with a 4.5V to
5.5V source to extend the maximum input voltage of
the device from 5.5V to 16V. The bias pin draws ap-
proximately 480mA during intial startup and drops down
to approximately 1mA once the internal bootstrap takes
over. The startup supply operates at approximately
175KHz for approximately TBD mS. After the bootstrap
takes over the startup supply stops switching.
CAP PIN:
The cap pin of the MSK5047RH provides bulk storage
and high frequency decoupling for the bootstrap supply.
This pin requires 1µF ceramic and TBD bulk capacitance
for normal operation.
INPUT CAPACITOR SELECTION:
The MSK5047RH should have an external high fre-
quency ceramic capacitor (0.1uF) between VIN and GND.
Connect a low-ESR bulk capacitor directly to the input
pin of the MSK5047RH. Select the bulk input filter ca-
pacitor according to input ripple-current requirements and
voltage rating, rather than capacitor value. Electrolytic
capacitors that have low enough ESR to meet the ripple-
current requirement invariably have more than adequate
capacitance values. Aluminum-electrolytic capacitors
are preferred over tantalum types, which could cause
power-up surge-current failure when connecting to ro-
bust AC adapters or low-impedance batteries. When
operating the MSK5047RH with a separate bias supply
the VBias pin requires TBD capacitance to ground. Addi-
tionally the MSK5047RH requires TBD µF of capacitance
on the cap pin
.
CROSS REGULATION:
TBD
OUTPUT CAPACITOR SELECTION:
The output capacitor values are generally determined
by the ESR and voltage rating requirements rather than
capacitance requirements for stability. Low ESR capaci-
tors that meet the ESR requirement usually have more
output capacitance than required for stability. Only spe-
cialized low-ESR capacitors intended for switching-regu-
lator applications, such as AVX TPS, Sprague 595D,
Sanyo OS-CON, Nichicon PL series or Kemet T510 se-
ries should be used.
The output ripple is usually dominated by the ESR of
the filter capacitors and can be approximated as IRIPPLE
x RESR. Including the capacitive term, the full equation
for ripple in the continuous mode is VNOISE(p-p) =
IRIPPLE x (RESR + 1/(2ΠfC). The MSK5047RH can sup-
port up to TBD µF capacitive load on each output.
DROPOUT VOLTAGE:
TBD
ENABLE FUNCTION:
The enable function of the MSK5047RH is configured
for open collector drive. Leaving the pin open allows
normal operation. Pulling the pin low disables the de-
vice.
3
PRELIMINARY Rev. - 7/04
APPLICATION NOTES CONT'D
TYPICAL VBIAS = VIN APPLICATION
4
PRELIMINARY Rev. - 7/04
TYPICAL PERFORMANCE CURVES
TBD
5
PRELIMINARY Rev. - 7/04
