CALIFORNIA MICRO DEVICES
CMPWR300
Pin Diagram
500mA SmartOR
TM
DUAL REGULATOR WITH V
AUX
SWITCH
Features
8-pin Power SOIC package
Continuous 3.3V output from three inputs
Complete Power Management solution
V
CC
, V
SBY
Regulator supplies 500mA output
Built-in hysteresis when selecting input supplies
Integrated switch has very low R
DS(ON)
0.12Ω (typ.)
Large Bypass Capacitors on inputs not required
Applications
PCI adapter cards with Wake-On-LAN
Network Interface Cards (NICs)
Multiple Power Systems
Systems with Standby Capabilities
Product Description
The CMPWR300 is a dual input regulator with V
AUX
switch ca-
pable of delivering 3.3V/500mA continuously. The output power
is provided from three independent input voltage sources on a
prioritized basis. Power is always taken in priority using the fol-
lowing order V
CC
, V
SBY
, and V
AUX
.
When V
CC
(5V) or V
SBY
is present, the device automatically en-
ables 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 (0.12Ω 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 both V
CC
and V
SBY
to be dynamically
switched without loss of output voltage.
Typical Application Circuit
Simplified Electrical Schematic
Pins
8
ST
ANDAR
D PART ORDE RING INFORMATION
Package
Ordering Part Number
Style
Part Marking
SOIC Power
CMPWR300SA
When placing an order please specify desired shipping: Tubes or Tape & Reel.
© 2000 Calirornia Micro Devices Corp. All rights reserved. CMPWR300 is a trademark of California Micro Devices Corp.
12/5/2000
C0621199
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
1
CALMIRCO [ CALIFORNIA MICRO DEVICES CORP ]
