Datasheet > AAT3680

AAT3680

更新时间： 2022-11-29 09:55:34

品牌	Logo	应用领域
ANALOGICTECH		电池控制器
页数	文件大小	规格书
18页	266K
描述
Lithium-Ion Linear Battery Charge Controller

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AAT3680 数据手册

AAT3680

Lithium-Ion 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

LED Signal

Generator

Comparator

Temperature Sense

Comparator

V_SS

Under

Over Current /

Power-On

Reset

Voltage

Lock Out

Short Circuit

Protection

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

the 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-tempera-

ture 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 one and two cell Lithium Ion or

Lithium Polymer batteries. It is a full-featured bat-

tery management system IC with multiple levels of

power savings, system communication and protec-

tion integrated inside. Refer to the block diagram

and flow chart in this section.

Cell Preconditioning

Before starting charging, the AAT3680 checks sev-

eral conditions in order to maintain a safe charging

environment. The input supply must be above the

minimum operating voltage, or undervoltage lock-

out threshold (V_UVLO), for the charging sequence to

begin. Also, the cell temperature, as reported by a

thermistor connected to TS pin, must be within the

proper window for safe charging. When these con-

ditions have been met, and a battery 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 pro-

grammed constant-current amount. For example if

Constant Current Charging

The 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 V_Pand CSI pins. The CSI pin monitors the

voltage across R_SENSEto provide feedback for the

current control loop. The AAT3680 remains in con-

stant current charge mode until the battery reaches

the voltage regulation point, V_CH

3680.2003.4.0.91

1 2 3 456 7 8...18

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AAT3680_06	ANALOGICTECH	Lithium-Ion/Polymer Linear Battery Charge Controller	获取价格
AAT3680IKS-4.1-T1	ANALOGICTECH	Lithium-Ion Linear Battery Charge Controller	获取价格
AAT3680IKS-4.2-T1	ANALOGICTECH	Lithium-Ion Linear Battery Charge Controller	获取价格
AAT3680IKS-4.2-T1	AAT	Lithium-Ion/Polymer Linear Battery Charge Controller	获取价格
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AAT3680IKS-8.4-T1	ANALOGICTECH	Lithium-Ion Linear Battery Charge Controller	获取价格

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