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AAT3684

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

Analog Technology Inc 

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AAT3684

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

Functional Block Diagram

ADP

Reverse Blocking

BAT

Current

Compare

CV/

Precharge

ISET

Constant

Current

STAT

EN

Charge

Status

Charge

Control

UVLO

Over-

Temperature

Protection

GND

Functional Description

The AAT3684 is a high performance battery charger

designed to charge single cell lithium-ion/polymer bat-

teries with up to 500mA of current from an external

power source. It is a stand-alone charging solution, with

just one external component required for complete func-

tionality. The AAT3684 precisely regulates battery charge

voltage and current for 4.2V lithium-ion/polymer battery

cells.

The adapter/USB charge input constant current level can

be programmed up to 500mA for rapid charging applica-

tions. The AAT3684 is rated for operation from -40°C to

+85°C. In the event of operating 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.

A status monitor output pin is provided to indicate the

battery charge state by directly driving one external

LED.

Battery temperature and charge state are fully moni-

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

or over-temperature failure, the device will automati-

cally shut down, protecting the charging device, control

system, and the battery under charge.

Charging Operation

The AAT3684 has four basic modes for the battery

charge cycle: pre-conditioning/trickle charge; constant

current/fast charge; constant voltage; and end of

charge. (See Figure 1.) (AAT3684-1 does not have trick-

le charge.)

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3684.2007.12.1.2

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