AAT3682(2005) Просмотр технического описания (PDF) - Advanced Analogic Technologies

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AAT3682
(Rev.:2005)

Lithium-Ion/Polymer Linear Battery Charger

Advanced Analogic Technologies 

AAT3682

Lithium-Ion/Polymer Linear Battery Charger

Functional Block Diagram

VP

T2X

CSI

BSENSE

TS

VCC

2X Trickle

Charge

Control

Current Loop

Error Amp

VREF

Voltage Loop

Error Amp

Voltage

Comparator

Temperature

Sense

Comparator

Loop Select

MUX

Driver

Charge Status

Logic Control

Microcontroller

Status Generator

MUX

LED Signal

Generator

Microcontroller

Read Enable

T2X

Power-On

Reset

Under-Voltage

Lock Out

Over-Current /

Short-Circuit

Protection

BAT

GATE

DRV

STAT

VSS

Functional Description

The AAT3682 is a linear charger designed for single

cell lithium-ion/polymer batteries. It is a full-featured

battery management system IC with multiple levels

of power savings, system communication, and pro-

tection integrated inside. Refer to the block diagram

above and the flow chart and typical charge profile

graph (Figures 1 and 2) in this section.

Cell Preconditioning

Before the start of charging, the AAT3682 checks

several conditions in order to maintain a safe charg-

ing environment. The input supply must be above

the minimum operating voltage, or under-voltage

lockout threshold (VUVLO), for the charging

sequence to begin. Also, the cell temperature, as

reported by a thermistor connected to the TS pin,

must be within the proper window for safe charging.

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3682.2005.02.1.1

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