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CMPWR330SAT

400mA SmartORTM Dual Regulator with VAUX Switch

California Micro Devices Corp 

CALIFORNIA MICRO DEVICES

CMPWR330

400mA SmartORTM Dual Regulator with VAUX Switch

Features

Applications

• Continuous 3.3V output from three inputs

• Complete power management solution

• VCC, VSBY regulator supplies 400mA output

• Built-in hysteresis when selecting input supplies

• Integrated switch has very low RDS(ON) 0.25Ω (TYP)

• Foldback current limiting protection

• Thermal overload shutdown protection

• 8-pin power SOIC package

• 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 VAUX 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 , V , and V .

CC SBY

AUX

When VCC (5V) or VSBY is present, the device automati-

cally enables 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 (0.25Ω 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 the VCC

input supply to be dynamically switched without loss of

output voltage.

PIN DIAGRAM AND ELECTRICAL SCHEMATIC

Top View

VSBY

1

VCC

2

VOUT

3

VAUX

4

8 GND

7 GND

6 GND

5 GND

CMPWR330

8-Pin Power SOIC

Pin Diagram

VSBY +

5V – 1µF

GND

CMPWR330

VSBY

VCC +

5V –

VCC

VAUX

VOUT

1µF

GND

+ VAUX

– 3.3V

VOUT

3.3V

400mA

10µF

GND

Typical Application Circuit

Package

Pins

8

STANDARD PART ORDERING INFORMATION

Ordering Part Number

Style

Tubes

Tape & Reel

Power SOIC

CMPWR330SA/T

CMPWR330SA/R

Part Marking

CMPWR330SA

©2001 California Micro Devices Corp. All rights reserved. Smart OR™ is a trademark of California Micro Devices.

215 Topaz Street, Milpitas, California 95035  Tel: (408) 263-3214

3/6/2001

Fax: (408) 263-7846

C1680101

www.calmicro.com

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