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http://www.union-ic.com

Rev.05 Nov.2013

9/12

UM375xx

Pin Function

IN (Pin 1): Power for UM375xx and Load Power is supplied to the devices through the IN pin.

The IN pin should be locally bypassed to ground if the UM375xx series are more than a few

inches away from another source of bulk capacitance. In general, the output impedance of a

battery rises with frequency, so it is usually advisable to include an input bypass capacitor in

battery-powered circuits. A capacitor in the range of 0.1μF to 1μF is usually sufficient.

GND (Pin 2): Ground and Heat Sink. Solder to a ground plane or large pad to maximize heat

dissipation.

SHDN

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(Pin 3): Shutdown, Active Low. This pin is used to put the UM375xx into shutdown. The

SHDN

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pin cannot be left floating and must be tied to the input pin if not used.

NC (Pin 4): Not Connected.

OUT (Pin 5): Voltage Regulated Output. The OUT pin supplies power to the load. A minimum

output capacitor of 1μF is required to ensure stability. Larger output capacitors may be required

for applications with large transient loads to limit peak voltage transients.

Typical Application Circuit