AAT3697IWP-4.2-T1 Ver la hoja de datos (PDF) - Analog Technology Inc

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AAT3697IWP-4.2-T1

2A Lithium-Ion/Polymer Battery Charger

Analog Technology Inc 

AAT3697

2A Lithium-Ion/Polymer Battery Charger

Functional Block Diagram

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 lithi-

um-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 exceeding the power dissi-

pation abilities of the device package for a given

constant current charge level, the charge control

will enter into thermal regulation. When the system

thermal regulation becomes active, the pro-

grammed constant current charge amplitude will

be automatically reduced to a safe level for the cur-

rent operating condition. Should the ambient oper-

ating temperature drop below the thermal loop

threshold, the system will automatically resume

charging at the full programmed constant 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 current 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 bat-

tery 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.

3697.2007.02.1.1

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