MIL-PRF-38534 & 38535 CERTIFIED FACILITY
RADIATION HARDENED
HIGH EFFICIENCY, 5 AMP
SWITCHING REGULATORS
5046RH
SERIES
FEATURES:
Up To 92% Conversion Efficiency For 5V Version
5 Amp Output Current
3.1V to 18V Input Range with Separate Bias
12V to 18V Input Range with UVLO (VBIAS=VIN)
Preset 1.5V,1.7V,1.8V,1.9V,2.0V,2.5V,3.0V,3.3V,3.4V or 5.0V Output Versions
User Programmable Current Limit
Output Trim Capability
Custom Compensation & Outputs Available
350KHz Switching Frequency
Surface Mountable Hermetic Package
-55°C to +125°C Operating Temperature Range
Total Dose Hardened to 300 Krads(Si) (Method 1019.7 Condition A)
Available with Gull Wing Leads
DESCRIPTION:
The MSK5046RH series are high efficiency, 5 amp, radiation hardened switching regulators. The output voltage is configured
for 1.5V,1.7V,1.8V,1.9V,2.0V,2.5V,3.0V,3.3V,3.4V or 5.0V internally with a tolerance of 1%.The very low output impedance
allows the MSK5046RH to drive the start up surge current required by many CPU's and FPGA's with little or no decrease in
the output voltage. The operating frequency of the MSK5046RH is 350KHz. A low quiescent current and very good operating
efficiency keep the total internal power dissipation of the MSK5046RH down to an absolute minimum. The device is packaged
in a hermetic surface mountable package for high reliability applications.
EQUIVALENT SCHEMATIC
TYPICAL APPLICATIONS
PIN-OUT INFORMATION
POL Applications
Satellite System Power Supply
Step-down Switching Regulator
Microprocessor, FPGA Power Source
High Efficiency Low Voltage
Subsystem Power Supply
1
2
3
4
5
6
7
1
CASE
CS+
CSSIGNAL GROUND
SENSE
ADJUST
SIGNAL GROUND
8
9
10
11
12-22
23-33
34-44
NC
SOFT START
ENABLE
VBIAS
VIN
POWER GROUND
VOUT
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ABSOLUTE MAXIMUM RATINGS
Input Voltage
VBIAS Voltage
Enable
Output Current
Thermal Resistance MOSFET(@ 125°C)
Diode(@ 125°C)
11
-0.3V, +20V
-0.3V, 18V
-0.3V, VBIAS
5.0 Amps
6.0°C/W
7.5°C/W
TST
TLD
TC
TJ
Storage Temperature Range 13
Lead Temperature Range
(10 Seconds)
Case Operating Temperature
MSK5046RH K/H Series
MSK5046RH Series
Junction Temperature
ESD Rating
-65°C to +150°C
300°C
-55°C to +125°C
-40°C to +85°C
+150°C
Class 1C
ELECTRICAL SPECIFICATIONS
NOTES:
1
2
3
4
5
6
7
8
9
10
11
12
13
VIN=12V, VBIAS=12V, IOUT=4.0A, RSENSE=15mΩ, COUT=3x100µF Low ESR tantalum (AVX P/N TAZH107M015L) + 1.0µF ceramic, SOFT START=NC, ENABLE=NC,
ADJUST=NC, 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 TJ = TC.
Industrial grade devices shall be tested to subgroup 1 and 4 unless otherwise specified.
Military grade devices ('H' and 'K' suffix) shall be 100% tested to subgroups 1,2,3 and 4.
Subgroup 1,4
TA=TC=+25°C
Subgroup 2
TA=TC=+125°C
Subgroup 3
TA=TC=-55°C
The device can operate with input voltages as high as 18V, but efficiency is best at lower inputs.
With VBIAS connected to a separate source, VIN Min. is VOUT + VDROPOUT; see typical dropout curves.
Sense resistor losses and VBIAS power not included. See typical performance curves.
The disabled bias current is the sum of the enable pin sink current (approximately VBIAS/10KΩ) and the internal bias current.
Continuous operation at or above absolute maximum ratings may adversely effect the device performance and/or life cycle.
Pre and post irradiation limits, up to 300Krad TID, are identical unless otherwise specified.
Internal solder reflow temperature is 180°C, do not exceed.
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APPLICATION NOTES
INPUT BIAS AND UVLO:
OUTPUT CAPACITOR SELECTION:
The VBIAS pin of the MSK5046RH provides bias to the
control circuitry. The VBIAS pin can be connected directly
to the input bus for 12V to 18V operation or it can be biased
separately with a 12V to 18V source to extend the input range
of the device. Refer to the paragraph titled "INPUT VOLTAGE
RANGE". For bias voltages greater than 16V series diodes or
resistors are recommended to bring VBIAS below 16V. The
MSK5046RH's built-in under voltage lockout feature prevents
damage to downstream devices in the event of a drop in
bias voltage. Under voltage lockout occurs at bias voltages
of approximately 10.3V rising and 9.5V falling. The internal
bias draws approximately 40mA under normal operation.
The MSK5046RH has no internal output capacitance. Use
between 200 and 400µF of low ESR bulk capacitance for optimum performance. For optimal performance use three AVX
part number TAZH107M015L (MIL part number CWR29H107M). See typical gain and phase response curves. Less
capacitance will increase the gain; more capacitance will
decrease the gain. For loads with large excursions use
surge rated capacitors. Additional 0.1µF ceramic capacitors
close to the load will help suppress high frequency switching
noise. Custom compensation to maximize performance with
a variety of capacitive loads is available; consult the factory.
INPUT VOLTAGE RANGE
SOFT START:
The MSK5046RH's input range of 12V to 18V can be further
extended down to 3.1V by using a separate bias supply. In
this configuration very efficient low V to low V conversion
can be achieved.
The internal 0.1µF soft start capacitor charges from a 12µA
(nominal) current source. Connect additional capacitance to
the soft start pin to slow the output rise further. The output
rise time is dependant on the input to ouput voltage ratio as
well as the soft start capacitance. The output rise time at
50% load may be approximated with the following equation:
POWER CIRCUIT LAYOUT CONSIDERATIONS:
TRISE=
Layout of the power circuitry will affect the overall performance of the MSK5046RH. Input power should be tied as
close to VIN (pins 12-22) as possible. Create a single point
ground as close to the MSK5046RH power ground pins
(23-33) as possible. The input power return should be tied
between the MSK5046RH power ground pins and the load.
Keeping the input power return connection as close to the
MSK5046RH power ground pins as possible and keeping the
distance between the MSK5046RH power ground pins and
the load to a minimum will maximize the performance. Tie
the signal ground pins (4 and 7) to the single point ground
with a short low impedance connection. See remaining notes
for more layout and application performance.
(VOUT + 0.6V) 2 Css
(VIN + 0.3V) 14
Where VOUT = the output voltage in volts.
VIN = the input bus voltage in volts.
Css = 0.1 + external soft start capacitance in µF.
The soft start will begin as soon as the bias voltage exceeds
the under voltage lockout threshold or the inhibit pin is released; whichever comes last. If bias voltage is applied and
the inhibit pin is released before the input voltage is applied,
the soft start will have risen early and the output will rise at
approximately the same rate as VIN and may overshoot.
Any circuit that holds the enable pin low until VIN rises will
ensure soft start when VBIAS must rise before VIN. The
circuit below may be adapted to suit a variety of applications.
INPUT CAPACITOR SELECTION:
The MSK5046RH should have an external high frequency
ceramic capacitor (0.1uF) between VIN and power ground.
Connect a low-ESR bulk capacitor directly to the input pin
of the MSK5046RH. Select the bulk input filter capacitor
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 robust AC adapters or low-impedance batteries.
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APPLICATION NOTES CONT'D
SENSE:
ADJUST:
It is very important that the DC voltage returned to the
SENSE pin from the output be as noise and oscillation free
as possible. This voltage helps to determine the final output
and therefore must be a clean voltage. Excessive noise or
oscillation can cause the device to have an incorrect output
voltage. Proper PC board layout techniques can help to
achieve a noise free voltage at the SENSE pin.
The output voltage of the MSK5046RH may be adjusted
up or down to accomodate a variety of system requirements.
Connecting a resistor between the adjust pin and the sense
pin will decrease the output voltage. Connecting a resistor
between the adjust pin and ground will increase the output
voltage.
CURRENT LIMIT:
The MSK5046RH current limit is user programmable by
means of an external low value sense resistor. The current
limit trips at approximately 100mV, ±20% across the sense
resistor. The output voltage will decrease when the current
limit is reached. In the case of a sudden and severe overload,
the MSK5046RH will reset and attempt a restart cycle. In
noisy systems, the use of a twisted pair helps reduce noise
succeptability of the sense circuit. The voltage present on the
sense resistor will have an AC component at the switching
frequency. The peak of the AC plus DC voltage will trip the
current fault. If current limit is not desired, simply connect
CS+ to ground and CS- to VOUT to disable the current
sense. Reference the MSK5046RH radiation test report for
typical current limit response to radiation dose. See total
dose radiation test performance paragraph at the end of this
section for a link to the radiation test report.
Devices configured for ouput voltages less than 2.5V are
trimmed in the negative direction by placing a resistor in
series with the sense connection. 2.5V devices can not be
trimmed in the negative direction. The table below gives approximate resistor values to trim the devices -5% and -10%.
Variable resistors may be used but high quality fixed resistors
are recommended. Keep extermal trim to a minimum to limit
the effect of temperature coeficient mismatch between the
external trim resistor and the internal components. Trim
beyond 5 or 10% is not recommended.
ENABLE FUNCTION:
The ENABLE pin of the MSK5046RH is designed for open
collector drive. Leaving the pin open will allow for normal
operation. Pulling the pin low will shut the device down.
The enable pin will source up to 3mA when pulled low with
high line voltage.
TOTAL DOSE RADIATION TEST
PERFORMANCE
Radiation performance curves for TID testing have been
generated for all radiation testing performed by MSK. These
curves show performance trends throughout the TID test
process and can be located in the MSK5046RH radiation
test report. The complete radiation test report is available in
the RAD HARD PRODUCTS section on the MSK website.
MINIMUM LOAD:
The MSK5046RH requires less than 2mA minimum load
to maintain regulation. Minimum loads greater than 200mA
at low line voltage and 400mA at high line voltage provide
faster load response.
http://www.mskennedy.com/store.asp?pid=9951&catid=19680
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APPLICATION NOTES CONT'D
TYPICAL LOW VOLTAGE APPLICATION
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TYPICAL PERFORMANCE CURVES
NOTE: Overall efficiency curves include VBias power consumption.
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TYPICAL PERFORMANCE CURVES CONT'D
GAIN AND PHASE RESPONSE
(SEE TYPICAL APPLICATION CIRCUIT)
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MECHANICAL SPECIFICATIONS
ESD TRIANGLE INDICATES PIN 1
WEIGHT=17 GRAMS TYPICAL
MSK5046-3.3 H RH G
ALL DIMENSIONS ARE SPECIFIED IN INCHES
ORDERING INFORMATION
LEAD FORM OPTIONS
BLANK=STRAIGHT; G=GULL WING
RADIATION HARDENED
SCREENING
BLANK= INDUSTRIAL; H=MIL-PRF-38534 CLASS H;
K= MIL-PRF-38534 CLASS K
OUTPUT VOLTAGE
1.5=+1.5V; 1.7=+1.7V; 1.8=+1.8V; 1.9=+1.9V; 2.0=+2.0V;
2.5=+2.5V; 3.0=+3.0V; 3.3=+3.3V; 3.4=+3.4V; 5.0=+5.0V
GENERAL PART NUMBER
The above example is a +3.3V, Class H screened regulator with gull wing leads.
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8548-62 Rev. L 2/15
MECHANICAL SPECIFICATIONS CONT'D
ESD TRIANGLE INDICATES PIN 1
WEIGHT=17 GRAMS TYPICAL
MSK5046-3.3 H RH
ALL DIMENSIONS ARE SPECIFIED IN INCHES
ORDERING INFORMATION
LEAD FORM OPTIONS
BLANK=STRAIGHT; G=GULL WING
RADIATION HARDENED
SCREENING
BLANK= INDUSTRIAL; H=MIL-PRF-38534 CLASS H;
K= MIL-PRF-38534 CLASS K
OUTPUT VOLTAGE
1.5=+1.5V; 1.7=+1.7V; 1.8=+1.8V; 1.9=+1.9V; 2.0=+2.0V;
2.5=+2.5V; 3.0=+3.0V; 3.3=+3.3V; 3.4=+3.4V; 5.0=+5.0V
GENERAL PART NUMBER
The above example is a +3.3V, Class H screened regulator.
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8548-62 Rev. L 2/15
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.
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