Datasheet > LM3641

LM3641

更新时间： 2024-09-25 22:51:51

品牌	Logo	应用领域
美国国家半导体 - NSC		电池
页数	文件大小	规格书
17页	331K
描述
Lithium-Ion Battery Pack Protection Circuit

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LM3641 数据手册

January 1999

LM3641

Lithium-Ion Battery Pack Protection Circuit

General Description

Features

n Automatic battery disconnect when the cell is

over-charged or over-discharged.

The LM3641 Lithium Protection Integrated Circuit resides in-

side a 3.6V Lithium-Ion battery pack consisting of a single

cell or multiple parallel cells. The IC controls the ON/OFF

state of a pair of low threshold N-channel power MOSFETs

placed in series with the battery cell(s). The purpose of this

MOSFET pair is to protect the cell(s) from inadvertent elec-

trical over-stress. The IC compares the cell voltage against

internally programmed minimum and maximum limits. Tran-

sient voltage faults of approximately 1.25 seconds are toler-

ated.

n Maximum cell voltage for MOSFET conduction is factory

programmable between 4.0V and 4.4V with a 25 mV

tolerance (0˚C to +60˚C).

n Minimum cell voltage for MOSFET conduction =

0.57•V_MAX3.5% (0˚C to +60˚C).

n Internal 4 mΩ current sense resistor provides 0.5A

maximum accuracy for detection of overcurrent faults.

The maximum charge and discharge current is factory

programmable between 1A and 5A. A single overcurrent

fault event opens and protects the MOSFET pair.

n Automatic detection of safe pack conditions for recovery

(MOSFET pair ON) from a fault condition (over/under

discharged or overcurrent).

The IC also monitors the bi-directional current flow in the bat-

tery pack by measuring the voltage across a robust 4 mΩ

current sensing resistor internal to the protection IC pack-

age. The IC turns OFF the MOSFET pair whenever any fault

limit is exceeded. Momentary current surges 4 ms are tol-

erated.

n Average current drain = 1.2 µA typical.

The Enable pin allows external ON/OFF control of the MOS-

FET pair and resets the IC after the MOSFET pair is turned

OFF and the pack is safe to operate again.

n Optional Enable pack terminal can be used to prevent

accidental short circuit of pack and for maximizing the

shelf life of the pack (IC powers down when the pack is

not in use).

n Over-current events cause connection of an internal

50 kΩ “FET-Bypass” resistance across OFF MOSFET

The limits for overcharge and overdischarge voltage, as well

as independent limits for each direction of overcurrent are

factory adjusted employing EEPROM.

pair. Loads 3–7 MΩ are required for return to

conduction mode.

n Over-charged states cause connection of a 5 kΩ

“Cell-Bypass” resistor to ensure that the cell is not

allowed to be overcharged by leakage paths.

Typical Application

DS012931-1

TRI-STATE^®is a registered trademark of National Semiconductor Corporation.

DS012931

www.national.com

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与LM3641相关器件

型号	品牌	获取价格	描述	数据表
LM3641M	NSC	获取价格	Lithium-Ion Battery Pack Protection Circuit
LM3642	TI	获取价格	具有高侧电流的 1.5A 同步升压 LED 闪光灯驱动器
LM3642TLE/NOPB	TI	获取价格	具有高侧电流的 1.5A 同步升压 LED 闪光灯驱动器 \| YZR \| 9 \| -40
LM3642TLE-LT/NOPB	TI	获取价格	具有高侧电流的 1.5A 同步升压 LED 闪光灯驱动器 \| YZR \| 9 \| -40
LM3642TLX/NOPB	TI	获取价格	具有高侧电流的 1.5A 同步升压 LED 闪光灯驱动器 \| YZR \| 9 \| -40
LM3642TLX-LT/NOPB	TI	获取价格	具有高侧电流的 1.5A 同步升压 LED 闪光灯驱动器 \| YZR \| 9 \| -40
LM3643	TI	获取价格	Synchronous Boost Dual LED Flash Driver with 1.5-A High-Side Current Sources
LM3643_15	TI	获取价格	Synchronous Boost Dual LED Flash Driver with 1.5-A High-Side Current Sources
LM3643A	TI	获取价格	Synchronous Boost Dual LED Flash Driver with 1.5-A High-Side Current Sources
LM3643AYFFR	TI	获取价格	Synchronous Boost Dual LED Flash Driver with 1.5-A High-Side Current Sources

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