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Copyright © 2007 Active-Semi, Inc.

ActivePMU

ACT8701

Product Brief, 09-Nov-07

Advanced Information - All Information Subject to Change

Four Channel Integrated Power Management IC

for Handheld Portable Equipment

SYSTEM BLOCK DIAGRAM

FEATURES

− ON/OFF Control and Status Indication

− 350mA PWM Step-Down DC/DC

− 550mA PWM Step-Down DC/DC

− Step-Up DC/DC with OVP

− Only 0.75mm Height

− RoHS Compliant

APPLICATIONS

GENERAL DESCRIPTION

The patent-pending ACT8701 is a complete, cost-

effective, highly-efficient ActivePMU

agement solution that is ideal for a wide range of

portable handheld equipment. This device inte-

grates two step-down DC/DC converters, one step-

up DC/DC converter with over-voltage protection

(OVP), and a full-featured, linear-mode Li+ battery

charger into a single, thin, space-saving package.

REG1 and REG2 are fixed-frequency, current-mode

PWM step-down DC/DC converters that are opti-

mized for high efficiency and are capable of supply-

ing up to 350mA and 550mA, respectively. REG3 is

a fixed-frequency, step-up DC/DC converter that

can be configured to generate a 3.3V buck/boost

output or can be used in a wide variety of regulated-

voltage applications such as TFT panel biasing.

The battery charger incorporates an internal power

MOSFET

for

constant-current/constant-voltage

thermally regulated charging of a single-cell Li+

battery.

The ACT8701 is available in a tiny 4mm x 4mm

24-pin Thin-QFN package that is just 0.75mm thin.

nRSTO

OUT2

1.2V to 3.3V

Up to 550mA

ON1

VIN

nMSTR

CHGLEV

Battery

100mA/500mA

OUT3

Up to 27.5V

nIRQ

OUT1

1.2V to 3.3V

Up to 350mA

ON2

nSTAT

ACT8701

REG3

Step-Up

DC/DC

Single Cell

Li+ Battery

Charger

System

Control

REG2

Step-Down

DC/DC

REG1

Step-Down

DC/DC