Innovative Power

TM

- 1 -

www.active-semi.com

Copyright © 2009 Active-Semi, Inc.

ActivePMU

I

Product Brief, 12-Mar-09

Advanced Information―All Information Subject to Change

SYSTEM BLOCK DIAGRAM

Active-Semi

Six Channel ActivePath

OUT3

Adjustable, or

0.8V to 4.4V

Up to 0.55A

OUT4

Up to 30V

7s x 3p WLEDs

System

Control

nIRQ

ON1

ON4

ON2

nPBIN

ActivePath

TM

&

Single-Cell Li+

Battery Charger

Li+ Battery

Programmable

Up to 1A

VSYS

CHG_IN

CHGLEV

DCCC

OUT2

Adjustable, or

0.8V to 4.4V

Up to 1.0A

nSTAT

ACIN

nRSTO

SCL

SDA

VSEL

ISET

REG3

Step-Down

DC/DC

REG4

Step-Up

DC/DC

REG2

Step-Down

DC/DC

OUT1

Adjustable, or

0.8V to 4.4V

Up to 1.3A

REG1

Step-Down

DC/DC

ACT8828

TM

PMU

PMU

Active

ON3

FEATURES

Selection

 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

 Only 0.75mm Height

 RoHS Compliant

APPLICATIONS

GENERAL DESCRIPTION

The patent-pending ACT8828 is a complete, cost

effective,

highly-efficient

ActivePMU

TM

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

I

DC/DC converters.

Tiny 5mm × 5mm 40-pin Thin-QFN package that is

just 0.75mm thin.