CMPWR150 Datasheet, PDF (1/15 Pages) California Micro Devices Corp – 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 Power SOIC thermal package
• RoHS compliant (lead-free) finishing
Applications
• PCI adapter cards
• Network Interface Cards (NICs)
• Dual power systems
• Systems with standby capabilities
• USB powered devices such as printers,
scanners, MP3 players and Zip drives
• See Application Note AP-211
500mA/3.3V SmartOR^TM
Power Regulator
CMPWR150
Product Description
The 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 housed in an 8-pin SOIC
thermally enhanced package which is ideal for space
critical applications. The CMPWR150 is available
with RoHS compliant lead-free finishing.
©2010 SCILLC. All rights reserved.
June 2010 Rev. 3
Publication Order Number:
CMPWR150/D