CMPWR150 Datasheet, PDF (1/8 Pages) California Micro Devices Corp – 500mA/3.3V SMARTOR Power Regulator

CALIFORNIA MICRO DEVICES
CMPWR150
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 (NIC’s)
• 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.
Pin Diagrams
n.c.
V_CC
GND
V_OUT
Drive
Top View
CMPWR150TO
5-pin TO-263 Package
n.c.
V_CC
V_OUT
Drive
Top View
GND
GND
GND
GND
CMPWR150SA
8-pin SOIC Thermal Package
Typical Application Circuit
CMPWR150
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.
Simplified Electrical Schematic
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.
STANDARD PART ORDERING INFORMATION
Package
Ordering Part Number
Pins
Style
Part Marking
Tape & Reel
Tubes
8
SOIC Thermal
CMPWR150SA
CMPWR150SA/R
CMPWR150SA/T
5
TO-263
CMPWR150TO
CMPWR150TO/R
CMPWR150TO/T
© 1999 California Micro Devices Corp. All rights reserved. SmartOR™ is a trademark of California Micro Devices Corp.
9/99
215 Topaz Street, Milpitas, California 95035 Tel: [phone]
Fax: [phone]
C0590899
www.calmicro.com
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