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Copyright © 2007 Active-Semi, Inc.

ActivePMU

ACT8704

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

− 550mA PWM Step-Down DC/DC

− 750mA PWM Step-Down DC/DC

− Step-Up DC/DC with OVP for WLED Bias

− Only 0.75mm Height

− RoHS Compliant

APPLICATIONS

GENERAL DESCRIPTION

The patent-pending ACT8704 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 for proces-

sor core and I/O power, one step-up DC/DC con-

verter with over-voltage protection (OVP) and a full-

featured, linear-mode Li+ battery charger into a sin-

gle, 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 550mA and 750mA, respectively. REG3 is

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

safely and efficiently biases a string of up to seven

white-LEDs for backlighting. The battery

charger

incorporates an internal power MOSFET for con-

stant-current/constant-voltage, thermally regulated

charging of a single-cell Li+ battery.

The ACT8704 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 750mA

ON1

VIN

nMSTR

CHGLEV

Battery

100mA/500mA

OUT3

WLED Bias

nIRQ

OUT1

1.2V to 3.3V

Up to 550mA

ON2

nSTAT

ACT8704

REG3

Step-Up

DC/DC

Single Cell

Li+ Battery

Charger

System

Control

REG2

Step-Down

DC/DC

REG1

Step-Down

DC/DC