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ACT8828
(Rev.:2009)

Six Channel ActivePath™ Power Management IC

Active-Semi, Inc 

Active-Semi

ACT8828

Rev 3, 24-Sep-09

Six Channel ActivePathTM Power Management IC

FEATURES

• ActivePathTM Li+ Charger with System Power

Selection

• Four Integrated Regulators:

− 1.3A High Efficiency Step-Down DC/DC

− 1.0A High Efficiency Step-Down DC/DC

− 0.55A High Efficiency Step-Down DC/DC

− 30V Step-Up DC/DC for up to 7s × 3p WLEDs

• I2CTM Serial Interface

• Minimal External Components

• Compatible with USB or AC-Adapter Charging

• 5×5mm, Thin-QFN (TQFN55-40) Package

− Only 0.75mm Height

− RoHS Compliant

APPLICATIONS

• Personal Navigation Devices

• Portable Media Players

• Smart Phones

GENERAL DESCRIPTION

The patent-pending ACT8828 is a complete, cost

effective, highly-efficient ActivePMUTM power

management solution that is ideal for a wide range of

high performance portable handheld applications such

as personal navigation devices (PNDs). This device

integrates the ActivePath complete battery charging

and management system with four power supply

channels.

The ActivePath architecture automatically selects the

best available input supply for the system. If the

external input source is not present or the system load

current is more than the input source can provide, the

ActivePath supplies additional current from the battery

to the system. The charger is a complete, thermally-

regulated, stand-alone single-cell linear Li+ charger

that incorporates an internal power MOSFET.

REG1, REG2, and REG3 are three independent,

fixed-frequency, current-mode step-down DC/DC

converters that output 1.3A, 1.0A, and 0.55A,

respectively. REG4 is a fixed-frequency, step-up

DC/DC converter that safely and efficiently biases

strings of up to 7 white-LEDs (up to a total of 21

LEDs) for display backlight applications. Finally, an

I2C serial interface provides programmability for the

DC/DC converters.

The ACT8828 is available in a tiny 5mm × 5mm 40-

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

SYSTEM BLOCK DIAGRAM

CHG_IN

CHGLEV

DCCC

ISET

ACIN

nSTAT

nPBIN

nIRQ

nRSTO

SCL

SDA

ON1

ON2

ON3

ON4

VSEL

ActivePathTM

&

Single-Cell Li+

Battery Charger

System

Control

REG1

Step-Down

DC/DC

REG2

Step-Down

DC/DC

REG3

Step-Down

DC/DC

REG4

Step-Up

DC/DC

ACT8828

PMU TM

Active

Innovative PowerTM

-1-

ActivePMUTM and ActivePathTM are trademarks of Active-Semi.

I2CTM is a trademark of Philips Electronics.

Li+ Battery

Programmable

Up to 1A

VSYS

OUT1

Adjustable, or

0.8V to 4.4V

Up to 1.3A

OUT2

Adjustable, or

0.8V to 4.4V

Up to 1.0A

OUT3

Adjustable, or

0.8V to 4.4V

Up to 0.55A

OUT4

Up to 30V

7s x 3p WLEDs

www.active-semi.com

Copyright © 2009 Active-Semi, Inc.

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