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Copyright © 2007 Active-Semi, Inc.

ActivePMU

ACT8700

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

 500mA 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 ACT8700 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) for WLED bias, 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 500mA, 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 ACT8700 is available in a tiny 4mm x 4mm

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

Product Brief, 10-Aug-07

Advanced Product Information–All Information Subject to Change