MSK5920RH-5.0KD - M.S. Kennedy Corp.

TYPICAL APPLICATIONS

4707 Dey Road Liverpool, N.Y. 13088 (315) 701-6751

MIL-PRF-38534 CERTIFIED

5920RH

SERIES

ISO-9001 CERTIFIED BY DSCC

M.S.KENNEDY CORP.

FEATURES:

Satellite System Power Supplies

Switching Power Supply Post Regulators

Constant Voltage/Current Regulators

Microprocessor Power Supplies

RAD TOLERANT

ULTRA LOW DROPOUT

POSITIVE LINEAR REGULATOR

EQUIVALENT SCHEMATIC

TYPICAL APPLICATIONS

DESCRIPTION:

The MSK 5920RH is a rad tolerant fixed linear regulator capable of delivering 3.0 amps of output current with

typical dropout of only 0.30 volts. An external shutdown function is ideal for power supply sequencing. This device

also has internal latching overload protection. The MSK 5920RH is radiation tolerant to 300K RAD and specifically

designed for many space/satellite applications. The device is packaged in a hermetically sealed space efficient 5 pin

SIP that is electrically isolated from the internal circuitry allowing for direct heat sinking.

PIN-OUT INFORMATION

VIN

GND

VOUT

SHUTDOWN

N/C

Total Dose Rated to 300K RAD

Ultra Low Dropout for Reduced Power Consumption

External Shutdown Function

Latching Overload Protection

Available in 1.5V,1.9V,2.5V,2.8V,3.3V and 5.0V Output Voltages

Output Current Limit

Available in 3 Lead Form Options: Straight, Up and Down

Replaces IR OMR9601

PRELIMINARY Rev. A 4/051

Input Voltage Range

Quiescent Current

Line Regulation

Load Regulation

Dropout Voltage

Output Current Limit

Shutdown Threshold

Shutdown Hysteresis

Ripple Rejection

Thermal Resistance

Storage Temperature Range

Lead Temperature Range

(10 Seconds)

Power Dissipation

Junction Temperature

ABSOLUTE MAXIMUM RATINGS

+10V

-55°C to +125°C

-40°C to +85°C

Supply Voltage

Output Current

Case Operating Temperature Range

MSK5920RH K/H/E

MSK5920RH

-65°C to +150°C

300°C

See SOA Curve

150°C

TST

TLD

+VIN

IOUT

Unless otherwise specified, VIN=VOUT+1V, VSHUTDOWN=0V and IOUT=0A. See figure 2 for typical test circuit.

Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only.

Industrial grade and "E" suffix devices shall be tested to subgroups 1 and 4 unless otherwise requested.

Military grade devices ("H" and "K" suffix) shall be 100% tested to subgroups 1,2,3 and 4.

Subgroup 5 and 6 testing available upon request.

Subgroup 1,4 TC=+25°C

Subgroup 2,5 TC=+125°C

Subgroup 3,6 TA=-55°C

Output current limit is dependent upon the values of VIN and VOUT. See Figure 1 and typical performance curves.

Continuous operation at or above absolute maximum ratings may adversely effect the device performance and/or life cycle.

VIN shall be as specified or VIN min., whichever is greater.

NOTES:

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Group A

Subgroup

2,3

5,6

10mA ≤ IOUT ≤ 1.0A

VIN=6.5V

IOUT=50mA

VOUT+0.4V ≤ VIN ≤ VOUT+1.3V

50mA ≤ IOUT ≤ 3.0A

VIN = VOUT+1V

Delta VOUT=1% IOUT=3.0A

VIN=VOUT+1V Overcurrent Latch Up

VOUT ≤ 0.2V (OFF)

VOUT=Nominal (ON)

Difference between voltage

threshold of VSDI (ON) and VSDI (OFF)

f=120Hz

IOUT = 50mA

Junction to Case @ 125°C Output Device

Typ.

±0.01

±0.06

0.22

0.26

1.3

0.02

0.03

2.2

Test Conditions

Max.

6.5

±0.50

±0.80

0.40

1.6

0.2

4.0

Min.

2.9

3.0

1.0

Min.

2.9

3.0

1.0

Max.

6.5

±0.60

±1.0

0.45

1.6

0.2

4.0

Typ.

0.01

0.06

0.22

1.3

0.02

2.2

%VOUT

°C/W

MSK5920K/H/E RH MSK5920RH

Parameter

ELECTRICAL SPECIFICATIONS

Units

○○○ ○○○○○○○

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PART NUMBER

MSK5920RH-1.5

MSK5920RH-1.9

MSK5920RH-2.5

MSK5920RH-2.8

MSK5920RH-3.3

MSK5920RH-5.0

OUTPUT VOLTAGE

+1.5V

+1.9V

+2.5V

+2.8V

+3.3V

+5.0V

PRELIMINARY Rev. A 4/05

APPLICATION NOTES

PIN FUNCTIONS

VIN - This pin provides power to all internal circuitry in-

cluding bias, start-up, thermal limit and overcurrent latch.

Input voltage range is 2.9V to 6.5V.

GND - Internally connected to ground, this pin should be

connected externally by the user to the circuit ground.

SHUTDOWN - There are two functions to the SHUTDOWN

pin. It may be used to disable the output voltage or to

reset a current latch condition. To activate the shutdown/

reset functions the user must apply a voltage greater than

1.3V to the SHUTDOWN pin. The output voltage will turn

on when the SHUTDOWN pin is pulled below the thresh-

old voltage. If the SHUTDOWN pin is not used, it should

be connected to ground. It should be noted that with the

shutdown pin tied to ground, a current latch condition

can only be reset by cycling power off, then on.

VOUT - This is the output pin for the device.

OUTPUT CAPACITOR SELECTION

Output capacitors are required to maintain regulation

and stability. A 220µF surface mount tantalum capacitor

in parallel with a 1.0µF ceramic capacitor from the output

to ground should suffice under most conditions. If the

user finds that tighter voltage regulation is needed during

output transients, more capacitance may be added. If more

capacitance is added to the output, the bandwidth may

suffer.

INPUT POWER SUPPLY BYPASSING

FIGURE 1

Overcurrent protection is provided by the MSK 5920RH

series through the use of a timed latch off circuit. The

internal latch timeout is triggered by an overcurrent con-

dition. To allow for start up surge currents, the timeout is

approximately 5.5mS at 25°C. If the overcurrent condi-

tion remains at the end of the timeout cycle, the regulator

will latch off until the latch is reset. The latch condition

can be reset by pulling the shutdown pin high or cycling

VIN off then back on. A thermal limit condition will trigger

the latch with no time out delay.

PRELIMINARY Rev. A 4/05

OVERCURRENT LATCH

To maximize transient response and minimize power sup-

ply transients it is recommended that a 100µF tantalum

capacitor is connected between VIN and ground. A 0.1µF

ceramic capacitor should also be used for high frequency

bypassing.

CURRENT LIMIT AND SOA

The MSK 5920RH current limit function is directly af-

fected by the input and output voltages. Figure 1 illus-

trates the relationship between VIN and ICL for various

output voltages. It is very important for the user to con-

sult the SOA curve when using input voltages which re-

sult in current limit conditions beyond 4.5 Amps. When

using input voltages which result in current limit above

4.5 Amps, the user must maintain output current within

the SOA curve to avoid damage to the device. Note that 5

Amp maximum is due to current carrying capability of the

internal wirebonds.

REPLACING THE OMR9601

When the MSK 5920RH-2.5 is used as a replacement

for the IR OMR9601, the user should recognize that the

MSK 5920RH-2.5 does not contain internal tantalum ca-

pacitors on the input and output. MSK does not typically

use tantalum capacitors in space level standard products

of this nature.

APPLICATION NOTES CONT.

HEAT SINK SELECTION

To select a heat sink for the MSK 5920RH, the follow-

ing formula for convective heat flow may 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

Power Dissipation=(VIN-VOUT) x IOUT

Next, the user must select a maximum junction tem-

perature. The absolute maximum allowable junction tem-

perature is 150°C. The equation may now be rearranged

to solve for the required heat sink to ambient thermal

resistance (RθSA).

Example:

An MSK 5920RH is connected for VIN=+3.3V and

VOUT=+2.5V. IOUT is a continuous 3A DC level. The am-

bient temperature is +25°C. The maximum desired junc-

tion temperature is +125°C.

RθJC=4.0°C/W and RθCS=0.15°C/W for most thermal

greases Power Dissipation=(3.3V-2.5V) x (3A)

=2.4 Watts

Solve for RθSA:

125°C - 25°C

2.4W

= 36.5°C/W

In this example, a heat sink with a thermal resistance

of no more than 36.5°C/W must be used to maintain a

junction temperature of no more than 125°C.

THERMAL LIMITING

The MSK 5920RH control circuitry has a thermal shut-

down temperature of approximately 150°C. This ther-

mal shutdown can be used as a protection feature, but

for continuous operation, the junction temperature of the

pass transistor must be maintained below 150°C. Proper

heat sink selection is essential to maintain these condi-

tions.

TYPICAL APPLICATIONS CIRCUIT

RθSA= -4.0°C/W - 0.15°C/W

PRELIMINARY Rev. A 4/05

FIGURE 2

TYPICAL PERFORMANCE CURVES

5 PRELIMINARY Rev. A 4/05

RADIATION PERFORMANCE CURVES

6 PRELIMINARY Rev. A 4/05

MECHANICAL SPECIFICATIONS

ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED.

ESD Triangle indicates pin 1.

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.

M.S. Kennedy Corp.

4707 Dey Road, Liverpool, New York 13088

Phone (315) 701-6751

FAX (315) 701-6752

www.mskennedy.com

ORDERING INFORMATION

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; 1.9=+1.9V; 2.5=+2.5V; 2.8=+2.8V;

3.3=+3.3V; 5.0=+5.0V

GENERAL PART NUMBER

MSK5920-3.3 K RH U

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

WEIGHT=7.7 GRAMS TYPICAL

PRELIMINARY Rev. A 4/05