MSK5046-5.0RHU - M.S. Kennedy Corp.

The MSK 5046RH series are high efficiency, 4 amp, radiation hardened switching regulators. The output voltage is

configured for 1.5V, 2.5V, 3.0V, 3.3V or 5.0V internally with a tolerance of 1% at 1.5 amps. The operating frequency

of the MSK 5046RH is 300KHz. A low quiescent current and greater than TBD operating efficiency keep the total

internal power dissipation of the MSK 5046RH down to an absolute minimum. The device is packaged in a hermetic

power package for high reliability applications, and is available fully compliant to MIL-PRF-38534 Class H or K.

4707 Dey Road Liverpool, N.Y. 13088

M.S.KENNEDY CORP.

(315) 701-6751

FEATURES:

5046RH

SERIES

ISO-9001 CERTIFIED BY DSCC

RADIATION HARDENED

HIGH EFFICIENCY, 4 AMP

SWITCHING REGULATORS

Up To 92% Conversion Efficiency For 5V Version

4 Amp Output Current

3.1V to 18V Input Range with Startup Bias

12V to 18V Input Range with UVLO (VBias=VIN)

Preset 1.5V, 2.5V, 3.0V, 3.3V or 5.0V Output Versions

Custom Output Voltages Available

300KHz Switching Frequency

Hermetic Package with Three Lead Form Options

-55°C to +125°C Operating Temperature Range

Total Dose Rated to TBDK RAD

DESCRIPTION:

EQUIVALENT SCHEMATIC

MIL-PRF-38534 CERTIFIED

TYPICAL APPLICATIONS PIN-OUT INFORMATION

Step-down Switching Regulator

Microprocessor, FPGA Power Source

High Efficiency Low Voltage

Subsystem Power Supply

COMP

ENABLE

VBOOT

VBIAS

VIN

SENSE

VOUT

RETURN

PRELIMINARY Rev. B 11/03

TST

TLD

Storage Temperature Range

Lead Temperature Range

(10 Seconds)

Case Operating Temperature

MSK5046RH Series

MSK5046RH K/H/E Series

Junction Temperature

ABSOLUTE MAXIMUM RATINGS

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-65°C to +150°C

300°C

-40°C to +85°C

-55°C to +125°C

+150°C

Input Voltage

Enable

Output Current

Thermal Resistance (@ 125°C)

-0.3V, +20V

-0.3V, 10.5V

4.0 Amps

10°C/W

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ELECTRICAL SPECIFICATIONS

PRELIMINARY Rev. B 11/03

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NOTES:

VIN=12V, VBias=12V, IOUT=1.5A 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 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 1,2,3 and 4.

Subgroup 1

Subgroup 2

Subgroup 3

Alternate output voltages are available. Please contact the factory.

VBoot is measured with a 40mA load on the VBoot pin.

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 approximately 3.1V.

Contact factory for post radiation limits.

Includes VBias power consumption.

TA=TC=+25°C

TA=TC=+125°C

TA=TC=-55°C

APPLICATION NOTES

BOOTSTRAPPING:

The MSK 5046RH's Vboot output can be used to supply

bias voltage once the device is operating. Use a diode to "OR"

the startup bias supply with the Vboot output if the startup

supply voltage is less than Vboot. Use a switching scheme if

Vboot is less than or equal to Vstartup. Additional bypass

capacitance is required on the Vbias input pin when

bootstrapping the MSK 5046RH. Since the bootstrap voltage

is stepped up from the output voltage, it will vary with load.

Any voltage drop between the output and the sense pin will

increase the bootstrap voltage. Direct biasing of the VBias

input may be more efficient due to the additional conversion

involved in bootstrapping.

PRELIMINARY Rev. B 11/03

INPUT CAPACITOR SELECTION:

The MSK 5046RH should have an external high frequency

ceramic capacitor (0.1uF) between VIN and GND. Connect a

low-ESR bulk capacitor directly to the input pin of the MSK

5046RH. 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 ca-

pacitors are preferred over tantalum types, which could cause

power-up surge-current failure when connecting to robust AC

adapters or low-impedance batteries.

INPUT BIAS AND UVLO:

The VBias pin of the MSK 5046RH provides bias to the con-

trol circuitry. The Vbias pin can be connected directly to the

input bus for 12V to 16V operation or it can be biased sepa-

rately with a 12V to 16V source to extend the input range of

the device refer to the paragraph titled "INPUT VOLTAGE

RANGE". The MSK 5046RH'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 opera-

tion.

INPUT VOLTAGE RANGE

The MSK 5046RH's input range of 12V to 16V can be fur-

ther 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.

OUTPUT CAPACITOR SELECTION:

SENSE:

ENABLE FUNCTION:

The ENABLE pin of the MSK 5046RH is designed for

open collector drive. Leaving the pin open will allow for

normal operation. Pulling the pin low will shut the de-

vice down.

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 incor-

rect output voltage. Proper PC board layout techniques

can help to achieve a noise free voltage at the SENSE

pin.

COMPENSATION:

When driving large capacitive loads it may be neces-

sary to connect a 10 to 20nF ceramic capacitor between

the VSENSE pin and the COMP pin. This will add a zero/

pole pair to the overall loop transfer function to prevent

oscillation and improve bandwidth.

The MSK 5046RH has an internal 0.1µF ceramic ca-

pacitor between VOUT and RETURN. An additional 1µF

of ceramic capacitance on the output will help suppress

the high frequency switching noise. Use between 100

and 300µF of low ESR bulk capacitance for optimum

performance. Larger output capacitance may require ad-

ditional loop compensation, refer to the paragraph titled

"Compensation".

APPLICATION NOTES CONT'D

TYPICAL BOOTSTRAPPED APPLICATION

PRELIMINARY Rev. B 11/03

TYPICAL PERFORMANCE CURVES

PRELIMINARY Rev. B 11/03

NOTE: Overall efficiency curves include VBias power consumption.

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.

Contact MSK for MIL-PRF-38534 Class H, Class K and Appendix G (radiation) status.

MECHANICAL SPECIFICATIONS

M.S. Kennedy Corp.

4707 Dey Road, Liverpool, New York 13088

Phone (315) 701-6751

FAX (315) 701-6752

www.mskennedy.com

PRELIMINARY Rev. B 11/03

The above example is a +3.3V, Military regulator with leads bent up.

ESD Triangle indicates Pin 1.

NOTE: ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED.

ORDERING INFORMATION

MSK5046-3.3 H RH U

LEAD CONFIGURATIONS

S= STRAIGHT; U= BENT UP; D= BENT DOWN

RADIATION HARDENED

SCREENING

BLANK= INDUSTRIAL; E=EXTENDED RELIABILITY

H=MIL-PRF-38534 CLASS H; K= MIL-PRF-38534 CLASS K

OUTPUT VOLTAGE

1.5=+1.5V; 2.5=+2.5V; 3.0=+3.0V; 3.3=+3.3V; 5.0=+5.0V

GENERAL PART NUMBER