CMPWR330 datasheet(2/13 Pages) ONSEMI

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CMPWR330

Rev. 3 | Page 2 of 13 | www.onsemi.com

Simplified Electrical Schematic

Typical Application Circuit

PIN DESCRIPTIONS

PIN(S)

NAME

DESCRIPTION

SBY

SBY is the standby input supply (5V), which is used to power the regulator whenever VCC is below

the deselect level (4.2V). If the V

SBY connection is made within a few inches of the main input filter,

a bypass capacitor may not be necessary. Otherwise a bypass filter capacitor in the range of 1µF

to 10µF will ensure adequate filtering.

CC is a positive input supply for the voltage regulator. Whenever this supply voltage exceeds the

CCSEL level (4.4V), it will be given priority and be used to power the regulator output. If this supply

voltage falls below the V

CCDES level (4.2V) it will immediately be deselected and no longer provide

power for the regulator output. An internal hysteresis voltage of 0.2V is used to prevent any

chatter during selection and deselection of V

CC. The effective source impedance of VCC should be

kept below 0.3

Ω to ensure changeover disturbances do not exceed the hysteresis level.

If the connection to V

CC is made within a few inches of the main input filter, a bypass capacitor

may not be necessary. Otherwise a bypass filter capacitor in the range of 1µF to 10µF will ensure

adequate filtering.

OUT

OUT is the output voltage. Power is provided from the regulator or via the low impedance auxiliary

switch. This output requires a capacitance of 10µF to ensure regulator stability and minimize the

peak output disturbance during power supply changeover.

AUX

AUX is the auxiliary voltage power source. This supply is selected only when VCC falls below 4.2V

and the V

SBY is not present. Under these conditions an internal switch is enabled and provides a

very low impedance connection directly between V

AUX and VOUT.

5-8

GND

The negative reference for all voltages. Also functions as a thermal path for heat dissipation.

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