CALIFORNIA MICRO DEVICES
CMPWR300
500mA SmartORTM DUAL REGULATOR WITH VAUX SWITCH
Features
8-pin Power SOIC package
Pin Diagram
Continuous 3.3V output from three inputs
Complete Power Management solution
VCC, VSBY Regulator supplies 500mA output
Built-in hysteresis when selecting input supplies
Integrated switch has very low RDS(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
Typical Application Circuit
The CMPWR300 is a dual input regulator with VAUX switch ca-
pableofdelivering3.3V/500mAcontinuously. Theoutputpower
is provided from three independent input voltage sources on a
prioritized basis. Power is always taken in priority using the fol-
lowing order VCC, VSBY, and VAUX
.
When VCC (5V) or VSBY is present, the device automatically en-
ables the regulator and produces a stable 3.3V output at VOUT
When only VAUX (3.3V) is present, the device provides a low
impedance direct connection (0.12Ω typ.) from VAUX to VOUT
.
.
All the necessary control circuitry needed to provide a smooth
and automatic transition between all three supplies has been
incorporated. This allows both VCC and VSBY to be dynamically
switched without loss of output voltage.
Simplified Electrical Schematic
S TA N D A R D P A R T O R D E R IN G IN F O R M A TIO N
Package
Ordering Part Num ber
Part Marking
Pins
Style
8
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.
C0621199
12/5/2000
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
1
CALMIRCO [ CALIFORNIA MICRO DEVICES CORP ]
