AAT3688 데이터 시트보기 (PDF) - Analog Technology Inc

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AAT3688

USB Port Lithium-Ion/Polymer Battery Charger

Analog Technology Inc 

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

Functional Description

The AAT3688 is a highly integrated single cell lithi-

um-ion/polymer battery charger IC designed to

operate from USB port VBUS supplies, while requir-

ing a minimum number of external components.

The device precisely regulates battery charge volt-

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

tery cells.

The AAT3688 is specifically designed for being

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 external-

ly 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

GND

maintaining the regulated port voltage. This sys-

tem assures the battery charge function will not

overload 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

monitored for fault conditions. In the event of an

over-voltage or over-temperature failure, the

device will automatically shut down, thus protecting

the charging device, control system, and the bat-

tery under charge. In addition 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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3688.2006.04.1.3

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