CALIFORNIA MICRO DEVICES
CMPWR330
400mA SmartOR
TM
Dual Regulator with V
AUX
Switch
Features
• Continuous 3.3V output from three inputs
• Complete power management solution
• V
CC
, V
SBY
regulator supplies 400mA output
• Built-in hysteresis when selecting input supplies
• Integrated switch has very low R
DS(ON)
0.25Ω (TYP)
• Foldback current limiting protection
• Thermal overload shutdown protection
• 8-pin power SOIC package
Applications
• PCI adapter cards with Wake-On-LAN
• Network Interface Cards (NICs)
• Multiple power systems
• Systems with standby capabilities
Product Description
The CMPWR330 is a dual input regulator with a fully
integrated V
AUX
switch capable of delivering up to
400mA continuously at 3.3V. The output power is
provided from three independent input voltage sources
on a prioritized basis. Power is always taken in priority
using the following order V
CC
, V
SBY
, and V
AUX
.
When V
CC
(5V) or V
SBY
is present, the device automati-
cally enables the regulator and produces a stable 3.3V
output at V
OUT
.
When only V
AUX
(3.3V) is present, the device provides a
low impedance direct connection (0.25Ω TYP) from V
AUX
to V
OUT
.
All the necessary control circuitry needed to provide a
smooth and automatic transition between all three
supplies has been incorporated. This allows the V
CC
input supply to be dynamically switched without loss of
output voltage.
PIN DIAGRAM AND ELECTRICAL SCHEMATIC
Top View
V
SBY
V
CC
V
OUT
V
AUX
1
2
3
4
8
7
6
5
GND
GND
GND
GND
V
CC
5V
+
–
V
SBY
5V
+
–
1µF
CMPWR330
V
SBY
V
CC
1µF
+
–
GND
V
OUT
3.3V
400mA
CMPWR330
8-Pin Power SOIC
V
OUT
V
AUX
GND
V
AUX
3.3V
10µF
GND
Pin Diagram
Typical Application Circuit
STANDARD PART ORDERING INFORMATION
Package
Pins
8
Style
Power SOIC
Ordering Part Number
Tubes
Tape & Reel
CMPWR330SA/T
CMPWR330SA/R
Part Marking
CMPWR330SA
©2001 California Micro Devices Corp. All rights reserved. Smart OR™ is a trademark of California Micro Devices.
C1680101
215 Topaz Street, Milpitas, California 95035
3/6/2001
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
1
CALMIRCO [ CALIFORNIA MICRO DEVICES CORP ]
