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ACT8740

Six Channel Integrated Power Management IC for Handheld Portable Equipment

Active-Semi, Inc 

ACT8740

Rev PrB, 25-Feb-08

Advanced Product Information―All Information Subject to Change

Six 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

• Five Integrated Regulators

− 350mA PWM Step-Down DC/DC

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

− 350mA Low Noise LDO

− 250mA Low Noise LDO

− 250mA Low Noise LDO

• 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

• Wireless Handhelds

• DMB Enabled Devices

• GPS Receivers, etc.

GENERAL DESCRIPTION

The patent-pending ACT8740 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 integrates

one PWM step-down DC/DC converter, one PWM

step-up DC/DC converter with over-voltage protec-

tion (OVP), three low dropout linear regulators

(LDOs) and a full-featured linear-mode Li+ battery

charger into a single, thin, space-saving package.

An I2C Serial Interface provides programmability for

the DC/DC converters, LDOs and battery charger.

REG1 is a fixed-frequency, current-mode PWM step

-down DC/DC converter that is optimized for high

efficiency and is capable of supplying up to 350mA

output current. REG2 is a fixed-frequency, step-up

DC/DC converter that safely and efficiently biases a

string of up to seven white-LEDs for backlighting.

REG3, REG4, and REG5 are low noise, high PSRR

linear regulators that are capable of supplying up to

350mA, 250mA, and 250mA, respectively. The bat-

tery charger incorporates an internal power MOS-

FET for constant-current/constant-voltage, thermally

regulated charging of a single-cell Li+ battery. All

DC/DC converters and LDOs output voltages are

programmable and controllable via the I2C interface.

The ACT8740 is available in a tiny 4mm x 4mm

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

SYSTEM BLOCK DIAGRAM

VIN

CHGLEV

nMSTR

nIRQ

SCL

SDA

ON1

Single-Cell Li+

Battery Charger

System Control

ACT8740

PMU TM

Active

REG1

Step-Down

DC/DC

REG2

Step-Up

DC/DC

REG3

LDO

REG4

LDO

REG5

LDO

Innovative Products. Active Solutions.

-1-

ActivePMUTM is a trademark of Active-Semi.

I2CTM is a trademark of Philips Electronics.

Battery

Programmable

Up to 1A

OUT1

1.1V to 4.4V

Up to 350mA

OUT2

WLED Bias

OUT3

1.4 to 3.7V

Up to 350mA

OUT4

1.4 to 3.7V

Up to 250mA

OUT5

1.4 to 3.7V

Up to 250mA

Pb-free

www.active-semi.com

Copyright © 2008 Active-Semi, Inc.

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