MSK5920-2.5RHS datasheet(3/7 Pages) MSK

Part #	MSK5920-2.5RHS

Description	RAD TOLERANT ULTRA LOW DROPOUT POSITIVE LINEAR REGULATOR

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Manufacturer	MSK [M.S. Kennedy Corporation]

Direct Link	http://www.mskennedy.com

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3 / 7 page

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

1.6V 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. ESR of the output capacitors should be maintained

at 0.1

Ω to 1Ω.

INPUT POWER SUPPLY BYPASSING

3

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.

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/IRUH33P253AIM

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

for the IR OMR9601 or IRUH33P253AIM, the user should

recognize that the MSK 5920-2.5RH does not contain in-

ternal tantalum capacitors on the input and output. MSK

does not typically use tantalum capacitors in space level

standard products of this nature.

Rev. G

1/06

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