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Copyright © 2007 Active-Semi, Inc.

ActivePMU

ACT8706

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 ACT8706 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

constant-current/constant-voltage, thermally regu-

lated charging of a single-cell Li+ battery.

The ACT8706 is available in a tiny 4mm x 4mm

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