CALIFORNIA MICRO DEVICES
CMPWR130
300mA SmartOR
TM
Regulator with V
AUX
Drive
Features
• Automatic detection of V
CC
input supply
• Glitch-free output during supply transitions
• Built-in hysteresis during supply selection
• 300mA output maximum load current
• Overload current protection
• Short circuit current protection
• Operates from either V
CC
or V
OUT
• 8-pin SOIC package
Applications
• PCI adapter cards
• Network Interface Cards (NIC’s)
• Dual power systems
• Systems with standby capabilities
Product Description
The SmartOR
TM
CMPWR130 is a low dropout regulator
that delivers up to 300mA of load current at a fixed 3.3V
output. An internal threshold level (TYP 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 thresh-
old, 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.
PIN DIAGRAM AND APPLICATION CIRCUIT
MGSF1PO2ELT1
Top View
V
CC
NC
NC
GND
1
2
3
4
8
7
6
5
DRIVE
V
OUT
V
OUT
NC
V
CC
5V
+
–
V
AUX
3.3V
GND
C
IN
1µF
CMPWR130
V
CC
+
DRIVE
V
OUT
GND
+
V
OUT
3.3V
300mA
C
OUT
4µF
GND
+
–
CMPWR130
8-Pin SOIC
Pin Diagram
Typical Application Circuit
STANDARD PART ORDERING INFORMATION
Package
Pins
8
Style
SOIC
Ordering Part Number
Tubes
Tape & Reel
CMPWR130S/T
CMPWR130S/R
Part Marking
CMPWR130S
C1670101
© 2001 California Micro Devices Corp. All rights reserved. SmartOR™ is a trademark of California Micro Devices Corp
215 Topaz Street, Milpitas, California 95035
3/5/2001
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
1
CALMIRCO [ CALIFORNIA MICRO DEVICES CORP ]
