UM37550S Datasheet, PDF (9/12 Pages) Union Semiconductor, Inc. – 300mA, Micropower, VLDO Linear Regulator

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
(Pin 3): Shutdown, Active Low. This pin is used to put the UM375xx into shutdown. The
SHDN ^___________ 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
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http://www.union-ic.com Rev.05 Nov.2013
9/12