UM36550S Datasheet, PDF (6/10 Pages) Union Semiconductor, Inc. – 300mA, Micropower, VLDO Linear Regulator

Line Transient Response
V_IN=4.3V to 5.3V(1V/div)
V_OUT=3.3V (100mV/div)
UM365XX
Line Transient Response
V_IN=5.3V to 4.3V(1V/div)
V_OUT=3.3V (100mV/div)
V_IN=4.3V,Iout=10mA ,
100us/div
V_IN=4.3V,Iout=10mA ,
100us/div
Pin Function
IN (Pin 1): Power for UM365XXS and Load. Power is supplied to the devices through the IN pin.
The IN pin should be locally bypassed to ground if the UM365XXS 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. The
UM365XXS series are designed to withstand reverse voltages on the IN pin with respect to both
ground and the output pin. In the case of a reversed input, which can happen if a battery is
plugged in backwards, the UM365XXS will act as if there is a large resistor in series with its input
with only a small amount of current flow.
OUT (Pin 2): 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. See the Applications
Information section for more information on output capacitance.
GND (Pin3): Ground and Heat Sink. Solder to a ground plane or large pad to maximize heat
dissipation.
Typical Application Circuit
VIN
IN
OUT
VOUT
1μF
1μF
GND
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http://www.union-ic.com Rev.01 Nov.2010
6/10