CMPWR330SA CALMIRCO [California Micro Devices Corp], CMPWR330SA Datasheet - Page 3

• Manufacturer Part Number: CMPWR330SA
• Description: 400mA SMARTOR Dual Regulator with V switch?
• Manufacturer: CALMIRCO [California Micro Devices Corp]

©2001 California Micro Devices Corp. All rights reserved. Smart OR™ is a trademark of California Micro Devices.
3/6/2001
Interface Signals
V
Whenever this supply voltage exceeds the V
(4.4V), it will immediately be given priority and be used
to power the regulator output. If this supply voltage falls
below the V
deselected and no longer provide power for the regula-
tor output. An internal hysteresis voltage of 0.2V is used
to prevent any chatter during selection and deselection
of V
kept below 0.3Ω to ensure changeover disturbances do
not exceed the hysteresis level.
If the connection to V
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.
V
ately used to power the regulator output whenever V
below the deselect level (4.2V).
CC
SBY
215 Topaz Street, Milpitas, California 95035 
5 - 8
CALIFORNIA MICRO DEVICES
is a positive input supply for the voltage regulator.
CC
Pin
is the standby input supply (5V), which is immedi-
1
2
3
4
. The effective source impedance of V
CCDES
Symbol
V
V
V
GND
V
OUT
SYB
AUX
CC
level (4.2V) it will immediately be
CC
is made within a few inches of
3.3V
Standby supply voltage (5V) input for regulator whenever V
Primary supply voltage (5V) input for regulator
Regulator voltage output (3.3V) regulator when either V
Auxiliary supply voltage (3.3V) input for low impedance switch
Reference for all voltages
5V
5V
GND
SBY
AUX
CC
V
DESELECT
4.2V
Simplified Electrical Schematic
CONTROLLER
+
+
–
CC
A
A
CCSEL
0.25Ω
UX
UX
should be
INTERFACE SIGNALS
S
S
W
W
Tel: [phone]
level
CC
V
3.3V
SELECT (V
ENABLE
REF
is
Description
REGULATOR AMP
+
If the V
main input filter, a bypass capacitor may not be neces-
sary. Otherwise a bypass filter capacitor in the range of
1µF to 10µF will ensure adequate filtering.
V
selected only when V
not present. Under these conditions an internal switch is
enabled and provides a very low impedance connection
directly between V
V
regulator or via the low impedance auxiliary switch. This
output requires a capacitance of 10µF to ensure regula-
tor stability and minimize the peak output disturbance
during power supply changeover.
GND provides the reference for all voltages.
–
CC
AUX
OUT
/V
V
is the auxiliary voltage power source. This supply is
is the output voltage. Power is provided from the
SBY
CC
V
SBY
SBY
)
connection is made within a few inches of the
Fax: [phone]
CC
or V
CC
OUT
falls below 4.2V.
SYB
CC
and V
falls below 4.2V and the V
is present
GND
400mA
V
3.3V
AUX
OUT
.
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CMPWR330
SBY
is
3