Datasheet > AAT3680

AAT3680

更新时间： 2022-12-26 18:52:05

品牌	Logo	应用领域
AAT		电池控制器
页数	文件大小	规格书
18页	213K
描述
Lithium-Ion/Polymer Linear Battery Charge Controller

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AAT3680 数据手册

AAT3680

Lithium-Ion/Polymer

Linear Battery Charge Controller

Functional Block Diagram

Microcontroller

Read Enable

2x Trickle

Charge

Control

Loop Select

MUX Driver

T2X

CSI

DRV

Current Loop

Error Amp

Microcontroller

Status Generator

STAT

REF

Voltage Loop

Error Amp

Charge Status

Logic Control

MUX

BAT

Voltage

Comparator

LED Signal

Generator

Temperature Sense

Comparator

VSS

Under-

Voltage

Lock Out

Over-Current /

Short-Circuit

Protection

Power-On

Reset

example, if the programmed charge current is

500mA, then the preconditioning mode (trickle

charge) current will be 50mA. Cell preconditioning

is a safety precaution for deeply discharged cells

and, furthermore, limits power dissipation in the

pass transistor when the voltage across the device

is largest. The AAT3680 features an optional T2X

mode, which allows faster trickle charging at

approximately two times the default rate. This

mode is selected by connecting the T2X pin to V_SS.

If an over-temperature fault is triggered, the fast

trickle charge will be latched off, and the AAT3680

will continue at the default 10% charge current.

Functional Description

The AAT3680 is a linear charge controller designed

for single-cell lithium-ion/polymer batteries. It is a

full-featured battery management system IC with

multiple levels of integrated power savings, system

communication, and protection. Refer to the block

diagram (above) and flow chart (Figure 1) in this

section for details.

Cell Preconditioning

Before the start of charging, the AAT3680 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 (V_UVLO), 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.

When these conditions have been met and a bat-

tery is connected to the BAT pin, the AAT3680

checks the state of the battery. If the cell voltage is

below V_MIN, the AAT3680 begins preconditioning

the cell. This is performed by charging the cell with

10% of the programmed constant current. For

Constant Current Charging

Cell preconditioning continues until the voltage on

the BAT pin reaches V_MIN

At this point, the

AAT3680 begins constant current charging (fast

charging). Current level for this mode is pro-

grammed using a current sense resistor R_SENSE

between the VP and CSI pins. The CSI pin moni-

tors the voltage across R_SENSEto provide feedback

for the current control loop. The AAT3680 remains

in constant current charge mode until the battery

reaches the voltage regulation point, V_CH

3680.2006.03.1.6

1 2 3 456 7 8...18

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