CMPWR101 Datasheet, PDF (1/6 Pages) California Micro Devices Corp – 250mA SMARTOR Regulator with V switch

CALIFORNIA MICRO DEVICES
CMPWR101
250mA SmartOR^TM Regulator with V_AUX Switch
Features
Applications
• Automatic detection of V_CC input supply
• Glitch-free output during supply transitions
• Built-in hysteresis during supply selection
• 250mA output maximum load current
• Fully integrated V_AUX switch
• Overload current protection
• Short circuit current protection
• Operates from either V_CC or V_AUX
• 8-pin SOIC package
• PCI adapter cards
• Network Interface Cards (NIC’s)
• Dual power systems
• Systems with standby capabilities
Product Description
The California Micro Devices’ SmartOR^TM CMPWR101 is
a low dropout regulator that delivers up to 250mA 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 automati-
cally disable the regulator when V_CC falls below the
threshold level. When the regulator is disabled, a low
impedance, fully integrated switch is enabled which
allows the output to be directly powered from an auxil-
iary 3.3V supply.
When V is restored to a level above the select thresh-
CC
old, the low impedance 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 to be dynamically
CC
switched without loss of output voltage.
An output logic signal, DRIVE, is active LOW whenever
the internal regulator is disabled.
PIN DIAGRAM AND APPLICATION CIRCUIT
V_CC
V_AUX
V_AUX
GND
Top View
1
8 DRIVE
2
7
V_OUT
3
6
V_OUT
4
5 NC
CMPWR101
8-Pin SOIC
Pin Diagram
+ C_IN
V_CC
1µF
5V +
–
CMPWR101
V_CC DRIVE
V_AUX
V_OUT
GND
+ _VAUX
– ^3.3V
V_OUT
3.3V
250mA
+ C_OUT
4µF
GND
Typical Application Circuit
Package
Pins
8
STANDARD PART ORDERING INFORMATION
Ordering Part Number
Style
Tubes
Tape & Reel
SOIC
CMPWR101S/T
CMPWR101S/R
Part Marking
CMPWR101S
© 2001 California Micro Devices Corp. All rights reserved. SmartOR™ is a trademark of California Micro Devices Corporation.
215 Topaz Street, Milpitas, California 95035  Tel: [phone]
3/6/2001
Fax: [phone]
C1660101
www.calmicro.com
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