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AAT3681A

500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger

Analog Technology Inc 

Functional Block Diagram

ADP

Current

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AAT3681A

500mA USB Port or AC Adapter

Lithium-Ion/Polymer Battery Charger

Reverse Blocking

CV/

Precharge

BAT

ISET

Constant

Current

STAT

EN

Charge

Status

Charge

Control

UVLO

Over-

Temperature

Protection

GND

Functional Description

The AAT3681A is a high performance battery

charger designed to charge single cell lithium-

ion/polymer batteries with up to 500mA of current

from an external power source. It is a stand-alone

charging solution, with just one external compo-

nent required for complete functionality. The

AAT3681A precisely regulates battery charge volt-

age and current for 4.2V lithium-ion/polymer bat-

tery cells.

The adapter/USB charge input constant current

level can be programmed up to 500mA for rapid

charging applications. The AAT3681A is rated for

operation from -40°C to +85°C. In the event of oper-

ating ambient temperatures exceeding the power

dissipation abilities of the device package for a given

constant current charge level, the charge control will

enter into thermal limit.

8

A status monitor output pin is provided to indicate

the battery charge state by directly driving one

external LED.

Device junction 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, protecting the

charging device, control system, and the battery

under charge.

Charging Operation

The AAT3681A has four basic modes for the bat-

tery charge cycle: pre-conditioning/trickle charge;

constant current/fast charge; constant voltage; and

end of charge. (See Figure 1.) (AAT3681A-1 does

not have trickle charge.)

3681A.2007.10.1.2

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