ACT8712 View Datasheet(PDF) - Active-Semi, Inc

Part Name

Description

Manufacturer

ACT8712

Four Channel Integrated Power Management IC for Handheld Portable Equipment

Active-Semi, Inc 

ACT8712

Rev0, 25-Feb-08

Advanced Product Information―All Information Subject to Change

Four Channel Integrated Power Management IC

for Handheld Portable Equipment

FEATURES

• Multiple Patents Pending

• Li+ Battery Charger with Integrated MOSFET

− Programmable Charge Current up to 1A

− ON/OFF Control and Status Indication

• Three Integrated Regulators

− 550mA Step-Down DC/DC

− 750mA Step-Down DC/DC

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

• I2CTM Compatible Serial Interface

− Programmable Output Voltages

− Configurable Operating Modes

• Minimal External Components

• 4x4mm, Thin-QFN (TQFN44-24) Package

− Only 0.75mm Height

− RoHS Compliant

APPLICATIONS

• Portable Devices and PDAs

• Digital Media Players

• Battery Operated Devices

• GPS Receivers, etc.

GENERAL DESCRIPTION

The patent-pending ACT8712 is a complete, cost

effective, highly efficient ActivePMUTM power man-

agement solution that is ideal for a wide range of

portable handheld equipment. This device inte-

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

PWM 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. An I2C Serial Interface provides program-

mability for the DC/DC converters and battery

charger.

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 PWM step-up 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. All DC/DC con-

verters’ output voltage are programmable and con-

trollable via the I2C interface.

The ACT8712 is available in a tiny 4mm x 4mm

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

SYSTEM BLOCK DIAGRAM

VIN

CHGLEV

nSTAT

nMSTR

nIRQ

nRSTO

SCL

SDA

ON1

ON2

Single-Cell Li+

Battery Charger

System Control

ACT8712

PMU TM

Active

REG1

Step-Down

DC/DC

REG2

Step-Down

DC/DC

REG3

Step-Up

DC/DC

Battery

Programmable

Up to 1A

OUT1

1.1V to 4.4V

Up to 550mA

OUT2

1.1V to 4.4V

Up to 750mA

OUT3

WLED Bias

Pb-free

Innovative Products. Active Solutions.

-1-

ActivePMUTM is a trademark of Active-Semi.

I2CTM is a trademark of Philips Electronics.

www.active-semi.com

Copyright © 2008 Active-Semi, Inc.

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