CALIFORNIA MICRO DEVICES

©2000 California Micro Devices Corp. All rights reserved. SmartOR™ is a trademark of California Micro Devices Corporation.

12/5/2000

1

215 Topaz Street, Milpitas, California 95035



Tel: (408) 263-3214

Fax: (408) 263-7846

www.calmicro.com

CMPWR160

USB Peripheral Power Management

Features

• 3.3V regulated output up to 500mA

• Quiescent current 35µA (typical)

• Shutdown mode current 7µA (typical)

• 30ms active LOW Power-On Reset (POR) pulse

• Thermal overload protection

• Foldback current limiting protection

• Reverse-current protection

• 8 pin SOIC power package

Applications

• Bus-powered USB peripherals

• Self-powered USB peripherals

• Portable/battery-powered devices

• Critical power monitoring, hot-insertion devices

C1571000

1

2

3

4

SD

POR

8

7

6

5

GND

GND

GND

GND

Top View

CMPWR160

8 LEAD SOIC

3.3V/500mA

POR

3.3V

+

–

SD

2.9V

GND

+

30ms

–

SD

Pin Diagram

Simplified Electrical Schematic

Standard Part Ordering Information

Package

Ordering Part Number

Pin

Style

Tubes

Tape & Reel

Part Marking

8

Power SOIC

CMPWR160SA/T

CMPWR160SA/R

CMPWR160SA

Regulator (LDO) with a Power-On Reset (POR) pulse

generator, and is intended for Universal Serial Bus

(USB) peripherals. To meet the specification require-

ments of both USB 1.0 and USB 2.0, the CMPWR160

draws a very low quiescent current (35µA), and delivers

up to 500mA of load current at a fixed 3.3V output.

The POR pulse (active LOW) has a typical duration of

30ms after the output has exceeded and stabilized

above 2.9V. Thus a new POR pulse is developed each

time the regulator power is interrupted and restored,

which occurs often on USB buses when cables are

connected (or disconnected) by the user. It is not

necessary to have a V

allowing the CMPWR160 to work in Wired-ORed power

systems.

When V

enter reverse-current protection mode and maintain

isolation between V

tions that can use power from the USB port in addition to

internal batteries or an AC adapter supply (Wired-ORed

power systems). In the event of V

V

and fully isolate the V

powered down on demand. While in shutdown mode the

POR circuitry will remain active, making the device

suitable for systems which contain backup or alternative

power sources.

The CMPWR160 is available in an 8-pin SOIC thermally

enhanced package, ideal for applications where space

is tight.

Block Diagram