CMPWR330 Ver la hoja de datos (PDF) - ON Semiconductor
Número de pieza
componentes Descripción
Fabricante
CMPWR330 Datasheet PDF : 13 Pages
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Typical Application Circuit
CMPWR330
Simplified Electrical Schematic
PIN(S)
1
2
3
4
5-8
PIN DESCRIPTIONS
NAME
VSBY
DESCRIPTION
VSBY 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 connection is made within a few inches of the main input filter,
SBY
a bypass capacitor may not be necessary. Otherwise a bypass filter capacitor in the range of 1µF
to 10µF will ensure adequate filtering.
VCC
VCC is a positive input supply for the voltage regulator. Whenever this supply voltage exceeds the
VCCSEL level (4.4V), it will be given priority and be used to power the regulator output. If this supply
voltage falls below the V level (4.2V) it will immediately be deselected and no longer provide
CCDES
power for the regulator output. An internal hysteresis voltage of 0.2V is used to prevent any
chatter during selection and deselection of V . The effective source impedance of V should be
CC
CC
kept below 0.3Ω to ensure changeover disturbances do not exceed the hysteresis level.
If the connection to V is made within a few inches of the main input filter, a bypass capacitor
CC
may not be necessary. Otherwise a bypass filter capacitor in the range of 1µF to 10µF will ensure
adequate filtering.
VOUT
V
AUX
GND
VOUT 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.
V is the auxiliary voltage power source. This supply is selected only when V falls below 4.2V
AUX
CC
and the V is not present. Under these conditions an internal switch is enabled and provides a
SBY
very low impedance connection directly between V and V .
AUX
OUT
The negative reference for all voltages. Also functions as a thermal path for heat dissipation.
Rev. 3 | Page 2 of 13 | www.onsemi.com
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