CALIFORNIA MICRO DEVICES
CMPWR150
Pin Diagrams
Top View
n.c.
V
CC
GND
V
OUT
Drive
CMPWR150TO
5-pin TO-263 Package
n.c.
V
CC
V
OUT
Drive
Top View
GND
GND
GND
GND
500mA / 3.3V SmartOR POWER REGULATOR
Features
Automatic detection of V
CC
input supply
Drive output logic to control external switch
Glitch-free output during supply transitions
500mA output maximum load current
Built-in hysteresis during supply selection
Controller operates from either V
CC
or V
OUT
8-pin SOIC Thermal or 5-pin TO-263 packages
Applications
PCI adapter cards
Network Interface Cards (NICs)
Dual power systems
Systems with standby capabilities
See Application Note AP-211
Product Description
California Micro Devices SmartOR
TM
CMPWR150 is a
low dropout regulator that delivers up to 500mA of
load current at a fixed 3.3V output. An internal threshold
level (typically 4.1V) is used to prevent the regulator
from being operated below dropout voltage. The device
continuously monitors the input supply and will
automatically disable the regulator when V
CC
falls below
the threshold level. When the regulator is disabled, the
control signal Drive (Active Low) is enabled, which
allows an external PMOS switch to power the load from
an auxiliary 3.3V supply.
When V
CC
is restored to a level above the select threshold,
the control signal for the external PMOS switch is disabled
and the regulator is once again enabled.
All the necessary control circuitry needed to provide a
smooth and automatic transition between the supplies
has been incorporated. This allows V
CC
to be dynamically
switched without loss of output voltage.
The CMPWR150 is available in either an 8-pin SOIC
thermally enhanced package, ideal for space critical
applications, or a 5-pin TO-263 package.
CMPWR150SA
8-pin SOIC Thermal Package
Typical Application Circuit
CMPWR150
Simplified Electrical Schematic
STANDARD PART ORDERING INFORMATION
Pa c k a g e
Orde ring Part N um be r
Pins
Style
Part Mark ing
Tape & R e e l
Tube s
8
5
SOIC Thermal
TO-263
CMPWR150SA
CMPWR150TO
CMPWR150SA/R
CMPWR150TO/R
CMPWR150SA/T
CMPWR150TO/T
© 1999 California Micro Devices Corp. All rights reserved. SmartOR is a trademark of California Micro Devices Corp.
9/99
C0590899
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
1
CALMIRCO [ CALIFORNIA MICRO DEVICES CORP ]
