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AAT3681AIJS-4.2-1-T1

更新时间： 2024-01-20 05:54:27

品牌	Logo	应用领域
ANALOGICTECH		电池
页数	文件大小	规格书
17页	204K
描述
500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger

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AAT3681A

500mA USB Port or AC Adapter

Lithium-Ion/Polymer Battery Charger

Functional Block Diagram

Reverse Blocking

ADP

BAT

Current

Compare

CV/

Precharge

UVLO

Charge

Control

Constant

Current

ISET

Over-

Temperature

Protection

Charge

Status

STAT

GND

A status monitor output pin is provided to indicate

the battery charge state by directly driving one

external LED.

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.

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 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.

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

1...5 6 789 10 11...17

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