MSK5046-3.0KRH - M.S. Kennedy Corp.

The MSK 5046RH 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 MSK 5046RH 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 MSK 5046RH is 350KHz. A

low quiescent current and very good operating efficiency keep the total internal power dissipation of the MSK

5046RH down to an absolute minimum. The device is packaged in a hermetic surface mountable package for high

reliability applications.

4707 Dey Road Liverpool, N.Y. 13088

M.S.KENNEDY CORP.

(315) 701-6751

FEATURES:

5046RH

SERIES

RADIATION HARDENED

HIGH EFFICIENCY, 5 AMP

SWITCHING REGULATORS

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 Tested to 300K RAD

Available with Gull Wing Leads

Contact MSK for MIL-PRF-38534 Qualification and Appendix G (Radiation Status)

DESCRIPTION:

EQUIVALENT SCHEMATIC

MIL-PRF-38534 CERTIFIED

TYPICAL APPLICATIONS PIN-OUT INFORMATION

Satellite System Power Supply

Step-down Switching Regulator

Microprocessor, FPGA Power Source

High Efficiency Low Voltage

Subsystem Power Supply

PRELIMINARY Rev. G 2/06

CASE

CS+

CS-

SIGNAL GROUND

SENSE

ADJUST

SIGNAL GROUND

12-22

23-33

34-44

SOFT START

ENABLE

VBIAS

VIN

POWER GROUND

VOUT

-0.3V, +20V

-0.3V, 18V

-0.3V, VBIAS

5.0 Amps

6.0°C/W

7.5°C/W

TST

TLD

Storage Temperature Range

Lead Temperature Range

(10 Seconds)

Case Operating Temperature

MSK5046RH K/H/E Series

MSK5046RH Series

Junction Temperature

ABSOLUTE MAXIMUM RATINGS

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-65°C to +150°C

300°C

-55°C to +125°C

-40°C to +85°C

+150°C

Input Voltage

VBIAS Voltage

Enable

Output Current

Thermal Resistance MOSFET(@ 125°C)

Diode(@ 125°C)

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ELECTRICAL SPECIFICATIONS

PRELIMINARY Rev. G 2/06

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NOTES:

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 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 1,2,3,4 and 7.

Subgroup 1,4,7

Subgroup 2

Subgroup 3

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.

Contact factory for post radiation limits.

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.

TA=TC=+25°C

TA=TC=+125°C

TA=TC=-55°C

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APPLICATION NOTES

PRELIMINARY Rev. G 2/06

INPUT CAPACITOR SELECTION:

The MSK 5046RH should have an external high fre-

quency ceramic capacitor (0.1uF) between VIN and power

ground. 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 require-

ments 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 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 para-

graph titled "INPUT VOLTAGE RANGE". For bias volt-

ages greater than 16V series diodes or resistors are rec-

ommended to bring VBIAS below 16V. 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 volt-

ages of approximately 10.3V rising and 9.5V falling. The

internal bias draws approximately 40mA under normal

operation.

INPUT VOLTAGE RANGE

The MSK 5046RH'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.

OUTPUT CAPACITOR SELECTION:

The MSK 5046RH has no internal output capacitance.

Use between 200 and 400µF of low ESR bulk capaci-

tance for optimum performance. For optimal performance

use three AVX part number TAZH107M015L (MIL part

number CWR29H-107M). For loads with large excur-

sions use surge rated capacitors. Additional 0.1µF ce-

ramic 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.

SOFT START:

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 capaci-

tance. The output rise time at 50% load may be ap-

proximated with the following equation:

TRISE= (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.

POWER CIRCUIT LAYOUT CONSIDERATIONS:

Layout of the power circuitry will affect the overall

performance of the MSK 5046RH. Input power should

be tied as close to VIN (pins 12-22) as possible. Create

a single point ground as close to the MSK 5046RH power

ground pins (23-33) as possible. The input power return

should be tied between the MSK 5046RH power ground

pins and the load. Keeping the input power return con-

nection as close to the MSK 5046RH power ground pins

as possible and keeping the distance between the MSK

5046RH 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.

The soft start will begin as soon as the bias voltage

exceeds the under voltage lockout threshold or the in-

hibit pin is released; whichever comes last. If bias volt-

age 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.

APPLICATION NOTES CONT'D

PRELIMINARY Rev. G 2/06

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. The enable pin will source up to 3mA when

pulled low with high line voltage.

It is very important that the DC voltage returned to

the SENSE pin from the output be as noise and oscilla-

tion 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 lay-

out techniques can help to achieve a noise free voltage

at the SENSE pin.

CURRENT LIMIT:

The MSK 5046RH 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 MSK 5046RH will reset and attempt

a restart cycle. In noisy systems, the use of a twisted

pair helps reduce noise succeptability of the sense cir-

cuit. 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.

ADJUST:

The output voltage of the MSK5046RH may be ad-

justed 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.

MINIMUM LOAD:

The MSK 5046RH requires less than 2mA minimum

load to maintain regulation. Minimum loads greater than

200mA at low line voltage and 400mA at high line volt-

age provide faster load response.

APPLICATION NOTES CONT'D

TYPICAL LOW VOLTAGE APPLICATION

PRELIMINARY Rev. G 2/06

TYPICAL PERFORMANCE CURVES

PRELIMINARY Rev. G 2/06

NOTE: Overall efficiency curves include VBias power consumption.

RADIATION CURVES

PRELIMINARY Rev. G 2/06

TBD

MECHANICAL SPECIFICATIONS

PRELIMINARY Rev. G 2/06

The above example is a +3.3V, Class H screened regulator with gull wing leads.

ESD Triangle indicates Pin 1.

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

ORDERING INFORMATION

MSK5046-3.3 H RH G

LEAD FORM OPTIONS

BLANK=STRAIGHT; G=GULL WING

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; 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

WEIGHT= 17 GRAMS TYPICAL

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 Qualification and Appendix G (radiation) status.

MECHANICAL SPECIFICATIONS CONTINUED

M.S. Kennedy Corp.

4707 Dey Road, Liverpool, New York 13088

Phone (315) 701-6751

FAX (315) 701-6752

www.mskennedy.com

PRELIMINARY Rev. G 2/06

The above example is a +3.3V, Class H screened regulator.

ESD Triangle indicates Pin 1.

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

ORDERING INFORMATION

MSK5046-3.3 H RH

LEAD FORM OPTIONS

BLANK=STRAIGHT; G=GULL WING

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; 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

WEIGHT= 17 GRAMS TYPICAL