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Copyright © 2008 Active-Semi, Inc.

ActivePMU

ACT8770

Product Brief, 19-Feb-08

Advanced Information―All Information Subject to Change

SYSTEM BLOCK DIAGRAM

FEATURES

− Auto-Select Charge Current (AC or USB)

− ON/OFF Control and Status Indication

− 350mA PWM Step-Down DC/DC

− 550mA PWM Step-Down DC/DC

− 250mA High PSRR LDO

− 250mA High PSRR LDO

− 250mA High PSRR LDO

− Only 0.75mm Height

− RoHS Compliant

APPLICATIONS

GENERAL DESCRIPTION

The patent-pending ACT8770 is a complete, cost-

power management solution that is ideal for a wide

range of portable handheld equipment. This device

integrates two PWM step-down DC/DC converters,

three low dropout linear regulators (LDOs) 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 to 350mA and 550mA, respectively. The three

LDOs are high PSRR linear regulators, each capa-

ble of supplying up to 250mA. The battery charger

incorporates an internal power MOSFET for con-

stant-current/constant-voltage, thermally regulated

charging of a single-cell Li+ battery.

The ACT8770 is available in a tiny 4mm x 4mm

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

nMSTR

OUT3

1.4V to 3.7V

Up to 250mA

ON3

VIN

CHGLEV

Battery

Selectable up to 1A

nIRQ

ON5

ACT8770

System

Control

ON1

OUT1

0.645V to 3.3V

Up to 350mA

REG2

Step-Down

DC/DC

REG1

Step-Down

DC/DC

REG3

LDO

REG4

LDO

REG5

LDO

Single Cell

Li+ Battery

Charger

ACIN

nSTAT

OUT2

0.645V to 3.3V

Up to 550mA

OUT4

1.4V to 3.7V

Up to 250mA

OUT5

1.4V to 3.7V

Up to 250mA

TM

PMU

PMU

Active

Six Channel Integrated Power Management IC

for Handheld Portable Equipment