AAT3680 Datasheet, PDF(9/18 Page) Advanced Analogic Technologies – Lithium-Ion Linear Battery Charge Controller

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AAT3680 Datasheet, PDF (9/18 Pages) Advanced Analogic Technologies – Lithium-Ion Linear Battery Charge Controller

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AAT3680

Lithium-Ion Linear Battery Charge Controller

STAT

RSENSE

0.2

FZT788B

2.5k

4.7ÂµF

100k

DRV

TX2

100k

CSI

BAT

AAT3680

VSS

STAT

BATT+

10ÂµF

BATT-

RT1

TEMP

RT2

Battery

0.1ÂµF Pack

High Speed Data Reporting Application Schematic

Protection Circuitry

The AAT3680 is truly a highly integrated battery

management system IC including several protection

features. In addition to battery temperature monitor-

ing, the IC constantly monitors for over-current and

over-voltage conditions; if an over-current situation

occurs, the AAT3680 latches off the pass device to

prevent damage to the battery or the system, and

enters shutdown mode until the over-current event is

terminated.

An over voltage condition is defined as a condition

where the voltage on the BAT pin exceeds the max-

imum battery charge voltage. If an over-voltage con-

dition occurs, the IC turns off the pass device until

voltage on the BAT pin drops below the maximum

battery charge constant voltage threshold. The

AAT3680 will resume normal operation after the

over-current or over voltage condition is removed.

During an over-current or over-voltage event, the

STAT will report a FAULT signal.

In the event of a battery over-temperature condition,

the IC will turn off the pass device and report a

FAULT signal on the STAT pin. After the system

recovers from a temperature fault, the IC will resume

operation in the 1X trickle charge mode to prevent

damage to the system in the event a defective bat-

tery is placed under charge. Once the battery volt-

age rises above the trickle charge to constant cur-

rent charge threshold, the IC will resume the con-

stant current mode.

Preconditioning

(Trickle Charge)

Phase

Constant Current

Phase

Constant Voltage

Phase

Output Charge

Voltage (VCH)

Preconditioning

Voltage Threshold

(VMIN)

Regulation

Current

(ICHARGE(REG))

Trickle Charge

and Termination

Threshold

Figure 4: Typical Charge Profile

3680.2003.4.0.91

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