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www.active-semi.com

Copyright © 2009Active-Semi, Inc.

Product Brief, 24-Sep-09

Advanced Information―All Information Subject to Change

ACT8935

SYSTEM BLOCK DIAGRAM

Active-Semi

FEATURES

Selection

− 2×900mA High Efficiency Step-Down

DC/DCs

− 700mA High Efficiency Step-Down DC/DC

− 4×150mA Low Noise, High PSRR LDOs

− Only 0.75mm Height,

− RoHS Compliant

APPLICATIONS

GENERAL DESCRIPTION

The ACT8935 is a complete, cost effective, highly-

that is ideal for a wide range of high performance

portable handheld applications such as personal

navigation devices (PNDs). This device integrates

management system with seven 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 Li+ charger.

REG1, REG2, and REG3 are fixed-frequency,

current-mode step-down DC/DC converters. REG1

and REG3 are capable of supplying up to 900mA of

output current, while REG2 supports up to 700mA.

REG4, REG5, REG6, and REG7 are high

performance,

low-noise,

low-dropout

linear

regulators that output up to 150mA each. Finally, an

DC/DC converters and LDOs.

Pb

Pb-free

OUT2

0.6V to 3.9V

Up to 700mA

OUT5

0.6V to 3.9V

Up to 150mA

System

Control

OUT4

0.6V to 3.9V

Up to 150mA

PBIN

SCL

&

Single-Cell Li+

Battery Charger

Li+ Battery

VSYS

OUT1

0.6V to 3.9V

Up to 900mA

PWRHLD

SDA

OUT7

0.6V to 3.9V

Up to 150mA

OUT6

0.6V to 3.9V

Up to 150mA

PWREN

nRSTO

nIRQ

nPBSTAT

nLBO

TH

ACT8935

CHGIN

ACIN

nSTAT

ISET

REG6

LDO

REG5

LDO

REG4

LDO

REG2

Step-Down

DC/DC

REG1

Step-Down

DC/DC

REG7

LDO

OUT3

0.6V to 3.9V

Up to 900mA

REG3

Step-Down

DC/DC

LBI

CHGLEV

EXTON

PMU

PMU

Active