AAT3688 データシートの表示（PDF） - Advanced Analogic Technologies

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AAT3688

USB Port Lithium-Ion/Polymer Battery Charger

Advanced Analogic Technologies 

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PRODUCT DATASHEET

AAT3688

USB Port Lithium-Ion/Polymer Battery Charger

Functional Block Diagram

USB

USBSEL

USBH

USBL

CHR

STAT1

STAT2

DATA

Charge

Reduction

Loop

Current

Compare

Constant

Current

Charge

Status

Reverse Blocking

Charge

Control

CV/

Precharge

UVLO

Over-

Temperature

Protect

BAT

Serial

Data

IC enable

Window

Comparator

80μA

TS

EN

GND

Functional Description

The AAT3688 is a highly integrated single cell lithium-

ion/polymer battery charger IC designed to operate from

USB port VBUS supplies, while requiring a minimum num-

ber of external components. The device precisely regu-

lates battery charge voltage and current for 4.2V lithi-

um-ion/polymer battery cells.

The AAT3688 is specifically designed to be powered from

a USB port VBUS supply, but it can also be powered from

any input voltage source capable supplying 4.5V to 5.5V

for loads up to 500mA. Depending on the USB port type,

the AAT3688 constant charge current can be externally

programmed for two levels, USB high and USB low, for

maximum constant current charge levels up to 500mA.

Typically, the USB charge levels are set at 500mA and

100mA for the USBH and USBL modes; however, the

user may program either mode to any level they desire

below 500mA. The USBH/L mode has an automatic

Charge Reduction Loop control to allow users to charge

the battery with limited available current from a USB

port while maintaining the regulated port voltage. This

system assures the battery charge function will not over-

load a USB port while charging if other system demands

also share power with the respective port supply.

Status monitor output pins are provided to indicate the

battery charge status by directly driving two external

LEDs. A serial interface output is available to report 14

various charge states to a system microcontroller.

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

AAT3688 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.

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