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Copyright © 2008 Active-Semi, Inc.

ActivePMU

I

SYSTEM BLOCK DIAGRAM

FEATURES

− Programmable Charge Current up to 1A

− ON/OFF Control

− 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

− Programmable Output Voltages

− Configurable Operating Modes

− Only 0.75mm Height

− RoHS Compliant

APPLICATIONS

GENERAL DESCRIPTION

The patent-pending ACT8740 is a complete, cost

agement solution that is ideal for a wide range of

portable handheld equipment. This device inte-

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

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

protection (OVP), three low dropout linear regula-

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

tery charger into a single, thin, space-saving pack-

ity 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 back-

lighting. REG3, REG4 and REG5 are low noise,

high PSRR linear regulators that are capable of

supplying up to 350mA, 250mA and 250mA, re-

spectively. The battery charger incorporates an

internal

power

MOSFET

for

constant-

current/constant-voltage, thermally regulated charg-

ing of a single-cell Li+ battery. All DC/DC converters

and LDOs output voltages are programmable and

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

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

Six Channel Integrated Power Management IC

for Handheld Portable Equipment

ACT8740

Product Brief, 03-Feb-08

Advanced Information―All Information Subject to Change

nMSTR

OUT3

1.4V to 3.7V

Up to 350mA

SDA

VIN

CHGLEV

Battery

Programmable

Up to 1A

nIRQ

ON1

ACT8740

System

Control

SCL

OUT1

1.1V to 4.4V

Up to 350mA

REG2

Step-Up

DC/DC

REG1

Step-Down

DC/DC

REG3

LDO

REG4

LDO

REG5

LDO

Single Cell Li+

Battery Charger

OUT2

WLED Bias

OUT4

1.4V to 3.7V

Up to 250mA

OUT5

1.4V to 3.7V

Up to 250mA

PMU

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