AAT3670 データシートの表示（PDF） - Advanced Analogic Technologies

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AAT3670

1.6A Dynamic Battery Charger and Power Manager

Advanced Analogic Technologies 

BatteryManagerTM

Functional Block Diagram

ADP

Switch 1

PRODUCT DATASHEET

AAT3670

1.6A Dynamic Battery Charger and Power Manager

OUT

USB

EN

ENBAT

CT

TERM

ADPSET

USBSET

ADPLIM

USBLIM

USBSEL

CHRADP

CHRUSB

Switch 2

Charge

System

Control

Temperature and

Current Sense

BAT

BATS

Voltage

Sense

Ref.

Temp.

Sense

TS

VTS

Ref.

STAT1 STAT2

GND

Functional Description

The AAT3670 is a dual input dynamic battery charge and

power control IC. The dual input capability is designed to

accommodate both AC power adapter and USB port

power sources. In addition, this device also provides

dynamic power control to charge a single cell Li-ion bat-

tery cell and power a system simultaneously.

The device contains separate charge regulation pass

devices to control the charge current or voltage for both

the adapter (ADP) and USB (USB) input power paths.

The AAT3670 also contains three additional load switches

to control and route input power to charge the battery,

supply the system load and manage power from the bat-

tery to the system load. This charge control and switch

array permits dynamic charging of the battery cell and

control of power to the system load simultaneously.

When an input power source is applied to the AAT3670,

the device selects the adapter or USB input to provide

power to the system load and charge the battery. If power

is present on both the ADP and USB inputs, the system

will select the ADP input since it provides greater power

levels and charges the battery with a greater current.

Without a valid ADP/USB supply present, the battery will

power the system load as long as the battery voltage is

greater than 2.9V. The battery voltage sense circuit will

disconnect the battery from the load if the cell voltage

falls below 2.9V to protect the battery cell from over-

discharge which would result in shortened battery life.

The system load current drawn from the battery is limited

internally. The AAT3670 precisely regulates battery charge

voltage and current for 4.2V Li-ion battery cells, and the

battery charge current can be programmed up to 1.6A for

16

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3670.2008.04.1.5

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