MSK5822-5.0KRHS - M.S. Kennedy Corp.

TYPICAL APPLICATIONS

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

MIL-PRF-38534 CERTIFIED 5822RH

SERIES

M.S.KENNEDY CORP.

FEATURES:

Satellite System Power Supplies

Switching Power Supply Post Regulators

Constant Voltage/Current Regulators

Microprocessor Power Supplies

RAD HARD

ULTRA LOW DROPOUT

POSITIVE LINEAR REGULATOR

EQUIVALENT SCHEMATIC

TYPICAL APPLICATIONS

DESCRIPTION:

The MSK 5822RH is a rad hard fixed linear regulator capable of delivering 5.0 amps of output current. Typical dropout

is only 0.22 volts with a 2.0 amp load. Separated power and bias simplifies supply tracking. This device also has latching

overload protection. The MSK 5822RH is radiation hardened and specifically designed for 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

VBIAS

VOUT

GND

LATCH

Manufactured using Space Qualified RH1573 Die

New "Harder" Version of MSK 5922RH

Total Dose Tested to 450K RAD (Method 1019.7 Condition A)

Low Dropout for Reduced Power Consumption

Latching Overload Protection

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

Alternate Output Voltages Available

Output Current Limit

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

Seperate Bias/Vin Pins for Improved Efficiency

Available to DSCC SMD 5962F09236

ELDRS Tested to 100 Krads(Si) (Method 1019.7 Condition D)

Rev. E 12/091

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

Bias Supply Voltage

Supply Voltage

Output Current

Case Operating Temperature Range

MSK5822K/H/E RH

MSK5822RH

-65°C to +150°C

300°C

See SOA Curve

150°C

TST

TLD

VBIAS

VIN

IOUT

Unless otherwise specified, VIN=VOUT+1V, VBIAS=5V and IOUT=10mA. 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.

Saturation voltage varies with load. See typical performance curves.

Pre and post irradiation limits, at +25°C, up to 300Krad TID, are identical unless otherwise specified.

Reference DSCC SMD 5962F09236 for electrical specifications for devices purchased as such.

NOTES:

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ELECTRICAL SPECIFICATIONS

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PART NUMBER

MSK5822-1.5

MSK5822-1.9

MSK5822-2.5

MSK5822-2.8

MSK5822-3.3

MSK5822-5.0

OUTPUT VOLTAGE

+1.5V

+1.9V

+2.5V

+2.8V

+3.3V

+5.0V

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Rev. E 12/09

APPLICATION NOTES

VIN - This pin provides the input power connection to the

MSK 5822RH. This is the supply that will be regulated to the

output. Input voltage range is VOUT + VDROPOUT to 6.5V.

VBIAS - This pin provides power to all internal circuitry

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

VBIAS voltage range is 2.9V to 6.5V. VBIAS should be

kept greater than or equal to VIN.

LATCH - The MSK 5822RH LATCH pin is used for both cur-

rent limit and thermal limit. A capacitor between the LATCH

pin and ground sets a time out delay in the event of an over

current or short circuit condition. The capacitor is charged

to approximately 1.6V from a 7.2µA (nominal) current source.

Exceeding the thermal limit charges the latch capacitor from

a larger current source for a near instant shutdown. Once

the latch capacitor is charged the device latches off until the

latch is reset. Momentarily pull the LATCH pin low, or cycle

the power to reset the latch. Cycling the bias power dis-

ables the device during the reset operation. Pulling the LATCH

pin low immediately enables the device for as long as the

LATCH pin is held low plus the time delay to re-charge the

latch capacitor whether or not the fault has been corrected.

Disable the latch feature by tying the LATCH pin low. With

the LATCH pin held low the thermal limit feature is disabled

and the current limit feature will force the output voltage to

droop but remain active if excessive current is drawn.

GND - Internally connected to ground, this pin should be

connected externally by the user to the circuit ground.

VOUT - This is the output pin for the device.

Output capacitors are required to maintain regulation and

stability. A 220µF surface mount tantalum capacitor from

the output to ground should suffice under most conditions.

Ceramic output capacitors (0.1µF typical) should be placed

directly across the load power connections as close to the

load as possible. If the user finds that tighter voltage regula-

tion 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

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.

START UP OPTIONS

The MSK 5822RH starts up and begins regulating immedi-

ately when VBIAS and VIN are applied simultaneously. Ap-

plying VBIAS before VIN starts the MSK 5822RH up in a

disabled or latched state. When starting in a latched state

the device output can be enabled by pulling the latch pin low

to drain the latch capacitor. Hold the latch pin low and re-

lease after VIN comes up to ensure automatic startup when

applying VBIAS before VIN. The basic circuit below can be

adapted to a variety of applications for automatic start up

when VBIAS rises before VIN.

As previously mentioned, the LATCH pin provides over

current/output short circuit protection with a timed latch-

off circuit. Reference the LATCH pin description note. The

latch off time out is determined with an external capacitor

connected from the LATCH pin to ground. The time-out

period is equal to the time it takes to charge this external

capacitor from 0V to 1.6V. The latch charging current is

provided by an internal current source. This current is a

function of bias voltage and temperature (see latch charg-

ing current curve). For instance, at 25°C, the latch charg-

ing current is 7.2µA at VBIAS=3V and 8µA at

VBIAS=6.5V.

In the latch-off mode, some additional current will be

drawn from the bias supply. This additional latching cur-

rent is also a function of bias voltage and temperature

(see typical performance curves).

The MSK 5822RH current limit function is directly affected

by the input and output voltages. Custom current limit is

available; contact the factory for more information.

OVERCURRENT LATCH-OFF/LATCH PIN CAPACITOR

SELECTION

OUTPUT CAPACITOR SELECTION

Rev. E 12/09

The MSK 5822RH sinks increased current during startup

to bring up the output voltage. Reference the "Saturated Drive

Current vs. Input Voltage" graph in the typical performance

curves of this data sheet and the "Understanding Startup

Surge Current With MS Kennedy's RH1573 Based Rad Hard

LDO Regulators" application note in the application notes

section of the MS Kennedy Web site for more information.

http://www.mskennedy.com/

START UP CURRENT

PIN FUNCTIONS

APPLICATION NOTES CONT.

To select a heat sink for the MSK 5822RH, the following

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 5822-2.5RH is connected for VIN=+3.3V and

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

ent temperature is +25°C. The maximum desired junction

temperature is +125°C.

RθJC=3.0°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

= 38.5°C/W

In this example, a heat sink with a thermal resistance

of no more than 38°C/W must be used to maintain a

junction temperature of no more than 125°C.

The MSK 5822RH 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. Exceeding the thermal limit activates the latch fea-

ture of the MSK 5822RH. Momentarily pull the latch pin

low or cycle the power to reset the latch.

TYPICAL APPLICATIONS CIRCUIT

RθSA= - 3.0°C/W - 0.15°C/W

FIGURE 2

THERMAL LIMITING

HEAT SINK SELECTION

Radiation performance curves for TID testing have been

generated for all radiation testing performed by MS Kennedy.

These curves show performance trends throughout the TID

test process and are located in the MSK 5822RH radiation

test report. The complete radiation test report will be avail-

able in the RAD HARD PRODUCTS section on the MSK

website.

TOTAL DOSE RADIATION TEST

PERFORMANCE

Rev. E 12/09

http://www.mskennedy.com/store.asp?pid=9951&catid=19680

Reference the MSK 5826RH RAD REPORT for ELDRS Re-

sults.

TYPICAL PERFORMANCE CURVES

5 Rev. E 12/09

TYPICAL PERFORMANCE CURVES

Rev. E 12/09

GAIN AND PHASE RESPONSE

The gain and phase response curves are for the MSK typical application circuit and are representative of typical device

performance, but are for reference only. The performance should be analyzed for each application to insure individual

program requirements are met. External factors such as temperature, input and output voltages, capacitors, etc. all can be

major contributors. Please consult factory for additional details.

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.

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

MSK5822-3.3 K RH U

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

NOTE: See DSCC SMD 5962F09236 for DSCC part number options.

WEIGHT=7.7 GRAMS TYPICAL

Rev. E 12/09