Datasheet > A4002E3SVR

A4002E3SVR

更新时间： 2022-02-26 11:03:23

品牌	Logo	应用领域
创瑞 - AITSEMI		/
页数	文件大小	规格书
12页	550K
描述
BATTERY MANAGEMENT

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A4002E3SVR 数据手册

AiT Semiconductor Inc.

A4002

www.ait-ic.com

BATTERY MANAGEMENT

ONE CELL LITHIUM-ION/POLYMER BATTERY PROTECTION IC

charger detection voltage (V_CHA). When an abnormal charge current flows into a battery in the overdischarge

condition, the A4002 consequently turns the charging control FET off and stops charging after the battery

voltage becomes the overdischarge detection voltage and the overcharge detection delay time (t_CU) elapses.

Abnormal charge current detection is released when the voltage difference between VM pin and GND pin

becomes lower than the charger detection voltage (V_CHA) by separating the charger. Since the 0V battery

charging function has higher priority than the abnormal charge current detection function, abnormal charge

current may not be detected by the product with the 0V battery charging function while the battery voltage is

low.

Load Short-circuiting Condition

If voltage of VM pin is equal or below short-circuiting protection voltage (V_SHORT), the A4002 will stop

discharging and battery is disconnected from load. The maximum delay time to switch current off is t_SHORT

This status is released when voltage of VM pin is higher than short protection voltage (V_SHORT), such as when

disconnecting the load.

Delay Circuits

The detection delay time for overdischarge current 2 and load short-circuiting starts when overdischarge

current 1 is detected. As soon as overdischarge current 2 or load short-circuiting is detected over detection

delay time for overdischarge current 2 or load short-circuiting, the A4002 stops discharging. When battery

voltage falls below overdischarge detection voltage due to overdischarge current, the A4002 stop discharging

by overdischarge current detection. In this case the recovery of battery voltage is so slow that if battery

voltage after overdischarge voltage detection delay time is still lower than overdischarge detection voltage,

the A4002 shifts to power-down.

0V Battery Charging Function^{1 2 3}

This function enables the charging of a connected battery whose voltage is 0V by self-discharge. When a

charger having 0V battery start charging charger voltage (V_0CHA) or higher is connected between B+ and

B-pins, the charging control FET gate is fixed to V_DDpotential. When the voltage between the gate and the

source of the charging control FET becomes equal to or higher than the turn-on voltage by the charger

voltage, the charging control FET is turned on to start charging. At this time, the discharging control FET is off

and the charging current flows through the internal parasitic diode in the discharging control FET. If the

battery voltage becomes equal to or higher than the overdischarge release voltage (V_DU), the normal condition

returns.

REV1.0

- JUN 2018 RELEASED -

- 7 -

1...4 5 678 9 10...12

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