AAT3697 查看數據表（PDF） - Advanced Analogic Technologies

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AAT3697

2A Lithium-Ion/Polymer Battery Charger

Advanced Analogic Technologies 

BatteryManagerTM

Functional Block Diagram

PRODUCT DATASHEET

AAT3697

2A Lithium-Ion/Polymer Battery Charger

ADPSET

ADP

ADPP#

4.2V

Voltage

Sense

Constant

Current

Current

Compare

Charge

Control

CV/

Precharge

UVLO

Over-

Temperature

Protection

BAT

Reverse Blocking

STAT1

Charge

TS

STAT2

Status

DATA

Serial

Data

IC enable

Watchdog

Timer

CT

EN

GND

Functional Description

The AAT3697 is a highly integrated single-cell lithium-

ion/polymer battery charger IC designed to operate with

standard AC adapter input sources, while requiring a

minimum number of external components. The AAT3697

precisely regulates battery charge voltage and current

for 4.2V lithium-ion/polymer battery cells.

The adapter charge input constant current level can be

programmed up to 2.0A for rapid charging applications.

The AAT3697 is rated for operation from -40°C to +85°C.

In the event of operating ambient temperatures exceed-

ing the power dissipation abilities of the device package

for a given constant current charge level, the charge

control will enter into thermal regulation. When the sys-

tem thermal regulation becomes active, the programmed

constant current charge amplitude will be automatically

reduced to a safe level for the current operating condi-

tion. Should the ambient operating temperature drop

below the thermal loop threshold, the system will auto-

matically resume charging at the full programmed con-

stant current level. This intelligent thermal management

system permits the AAT3697 to operate and safely

charge a battery cell over a wide range of ambient condi-

tions while maximizing the greatest possible charge cur-

rent for the given set of conditions.

Status monitor output pins are provided to indicate the

battery charge state by directly driving two external LEDs.

A serial interface output is also available to report any one

of 12 distinct charge states to the system microcontroller.

Battery temperature and charge state are fully monitored

for fault conditions. In the event of an over-voltage or

over-temperature failure, the device will automatically

shut down, thus protecting the charging device, control

system, and the battery under charge. In addition to

internal charge controller thermal protection, the AAT3697

also provides a temperature sense feedback function (TS

pin) from the battery to shut down the device in the

event the battery exceeds its own thermal limit during

charging. All fault events are reported to the user either

by the simple status LEDs or via the DATA pin function.

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