CMPWR101 datasheet(2/12 Pages) ONSEMI

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CMPWR101

Rev. 3 | Page 2 of 12 | www.onsemi.com

Simplified Electrical Schematic

Typical Application Circuit

PIN DESCRIPTIONS

PIN(S)

NAME

DESCRIPTION

CC is the power source for the internal regulator and is monitored continuously by an internal controller

circuit. Whenever V

CC exceeds VCCSEL (4.25V typically), the internal regulator will be enabled and deliver

a fixed 3.3V at V

OUT.

When V

CC falls below VCCDES (4.10V typically), the regulator will be disabled. Internal loading on this pin is

typically 0.6mA when the regulator is enabled, which reduces to 0.1mA whenever the regulator is

disabled. If V

CC falls below the voltage on the VAUX pin, the VCC loading will further reduce to only a few

microamperes. During a V

CC power-up or power-down sequence, there will be an effective step increase

in V

CC line current when the regulator is enabled/disabled. This line current transient will cause a voltage

disturbance at the V

CC pin. The magnitude of the disturbance will be directly proportional to the effective

power supply source impedance being delivered to the V

CC input.

A built-in hysteresis voltage of 150mV has been incorporated to minimize any chatter during supply

changeover. It is recommended that the power supply connected to the V

CC input should have a source

resistance of less than 0.25

Ω to minimize the event of chatter during the enabling/disabling of the

regulator.

If the V

CC pin is within a few inches of the main input filter, a capacitor may not be necessary. Otherwise

an input filter capacitor in the range of 1µF to 10µF will help to lower the effective source impedance.

2 - 3

AUX

AUX is the auxiliary power source. When selected, (VCC < VCCDES), the auxiliary supply is directly

connected to V

OUT, via the low impedance (0.3Ω typically) fully integrated switch.

The internal loading on this pin is typically less than 10µA and will increase to 100µA if V

CC falls below

the voltage on V

AUX.

When V

AUX = 0V, the VCCDES voltage is inhibited which prevents the regulator from being disabled.

GND

GND is the negative reference for all voltages. The current that flows in the ground connection is very

low (typically 0.6mA) and has minimal variation over all load conditions.

NC is an unconnected pin which is electrically isolated from the internal circuitry

6 - 7

OUT

OUT is the regulator output voltage connection used to power the load. An output capacitor of 4.7µF is

used to provide the necessary phase compensation, thereby preventing oscillation. The capacitor also

helps to minimize the peak output disturbance during power supply changeover.

DRIVE

DRIVE is a CMOS output logic signal (Active Low) referenced to the V

CC supply. This output is taken low

whenever the internal regulator is not enabled. This output is intended only as a control signal for

external circuitry.

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