AAT3689(2007) 데이터 시트보기 (PDF) - Advanced Analogic Technologies

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AAT3689
(Rev.:2007)

0.5A/1.0A USB Port/Adapter Lithium-Ion/Polymer Battery Charger

Advanced Analogic Technologies 

BatteryManagerTM

PRODUCT DATASHEET

AAT3689

0.5A/1.0A USB Port/Adapter Lithium-Ion/Polymer Battery Charger

Functional Block Diagram

USB

USBSET

Current

Compare

Reverse Blocking

CV/

Precharge

ADPSET

ADP

STAT1

STAT2

EN

Constant

Current

Current

Compare

Charge

Control

UVLO

Over-

Temperature

Protection

BAT

Voltage

Sense

Charge

Status

Reverse Blocking

80uA

Window

Comparator

IC Enable

Watchdog

Timer

TS

CT

GND

Functional Description

The AAT3689 is a highly integrated single cell lithium-

ion/polymer battery charger IC designed to operate with

USB port and AC adapter inputs, while requiring a mini-

mum number of external components. The AAT3689

precisely regulates battery charge voltage and current

for 4.2V lithium-ion/polymer battery cells.

The adapter charge input constant current level may be

programmed up to 1.0A for rapid charging applications.

In the absence of a high current adapter input source,

the AAT3689 may be powered from a USB port VBUS sup-

ply. The USB constant charge current can be externally

programmed for maximum constant current charge lev-

els up to 500mA. The USB charge function is automati-

cally disabled when an adapter input power source

greater than 4.5V is present.

Status monitor output pins are provided to indicate the

battery charge status by directly driving two external

LEDs.

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, thus protecting the charging device,

control system, and the battery under charge. In addi-

tion to internal charge controller thermal protection, the

AAT3689 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.

Charging Operation

Regardless of which charge input function is selected

(i.e., either the adapter input or USB input), the AAT3689

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).

10

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3689.2007.12.1.1

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