AAT3682

DATA SHEET

Li-Ion/Polymer Linear Battery Charger

8

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

201884B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

Functional Description

The AAT3682 is a linear charger designed for single-cell

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

tery management system IC with multiple levels of

power savings, system communication, and protection

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 sev-

eral conditions in order to maintain a safe charging envi-

ronment. The input supply must be above the minimum

operating voltage, or under-voltage lockout threshold

temperature, as reported by a thermistor connected to

the TS pin, must be within the proper window for safe

charging.

Functional Block Diagram

MUX

T2X

LED Signal

Generator

Microcontroller

Status Generator

Microcontroller

Read Enable

Charge Status

Logic Control

Power-On

Reset

VSS

STAT

DRV

GATE

BAT

Under-Voltage

Lock Out

Over-Current /

Short-Circuit

Protection

2X Trickle

Charge

Control

Loop Select

MUX

Driver

V

REF

Temperature

Sense

Comparator

Voltage

Comparator

Voltage Loop

Error Amp

Current Loop

Error Amp

VP

VCC

BSENSE

T2X

TS

CSI