Datasheet > ACT8828_12

ACT8828_12

更新时间： 2022-05-26 03:50:45

品牌	Logo	应用领域
技领 - ACTIVE-SEMI		/
页数	文件大小	规格书
50页	720K
描述
Six Channel ActivePathTM Power Management IC

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ACT8828_12 数据手册

ACT8828

Rev 7, 15-Nov-12

Six Channel ActivePath^TMPower Management IC

FEATURES

GENERAL DESCRIPTION

• ActivePath^TMLi+ Charger with System Power

The patent-pending ACT8828 is a complete, cost

effective, highly-efficient ActivePMU^TMpower

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.

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

• I²C^TMSerial Interface

• Minimal External Components

• Compatible with USB or AC-Adapter Charging

• 5×5mm, Thin-QFN (TQFN55-40) Package

− Only 0.75mm Height

− RoHS Compliant

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.

APPLICATIONS

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.

• Personal Navigation Devices

• Portable Media Players

• Smart Phones

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

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

SYSTEM BLOCK DIAGRAM

Li+ Battery

Programmable

Up to 1A

CHG_IN

ActivePath^TM

CHGLEV

DCCC

ISET

VSYS

Single-Cell Li+

Battery Charger

REG1

Step-Down

DC/DC

OUT1

ACIN

Adjustable, or

0.8V to 4.4V

Up to 1.3A

nSTAT

REG2

Step-Down

DC/DC

nPBIN

nIRQ

nRSTO

SCL

OUT2

Adjustable, or

0.8V to 4.4V

Up to 1.0A

REG3

Step-Down

DC/DC

OUT3

Adjustable, or

0.8V to 4.4V

Up to 0.55A

SDA

System

Control

ON1

REG4

Step-Up

DC/DC

ON2

OUT4

Up to 30V

7s x 3p WLEDs

ON3

ON4

ACT8828

VSEL

ActivePMU

Innovative Power^TM

- 1 -

www.active-semi.com

ActivePMU^TMand ActivePath^TMare trademarks of Active-Semi.

I²C^TMis a trademark of NXP.

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