CMPWR330

©2010 SCILLC. All rights reserved.

Publication Order Number:

June 2010 Rev. 3

CMPWR330/D

Features

•

Continuous 3.3V output from three inputs

•

Complete power management solution

•

V

•

Built-in hysteresis when selecting input supplies

•

Integrated switch has very low R

of 0.25

Ω (TYP)

•

Foldback current limiting protection

•

Thermal overload shutdown protection

•

8-pin power SOIC package

•

RoHS compliant (lead-free) finishing

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 VAUX switch capable of delivering up to

400mA continuously at 3.3V. The input is taken from

three independent voltage sources on a prioritized

basis. Power is always taken in priority using the

order of V

When V

CC,

(5V) or V

SBY

is present, the device

automatically enables the regulator and produces a

stable 3.3V output at V

When only V

a low impedance direct connection (0.25

Ω TYP.)

from V

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.

The CMPWR330 is housed in an 8-pin SOIC

package and is available with RoHS compliant lead-

free finishing.