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Features: Automatic battery disconnect when the cell is over-charged or over-discharged.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). Minimum cell voltage for MOSFET conduction =0.57•VMAX ±3.5% (0°C to +60°C)...

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SeekIC No. : 004395403 Detail

LM3641: Features: Automatic battery disconnect when the cell is over-charged or over-discharged.Maximum cell voltage for MOSFET conduction is factory programmable between 4.0V and 4.4V with a ±25 mV tolera...

LM3641 Data Sheet

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Part Number:: LM3641
Supply Ability:: 5000

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Upload time: 2024/4/27

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Product Details

Description

Features:

Automatic battery disconnect when the cell is over-charged or over-discharged.
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).
Minimum cell voltage for MOSFET conduction =0.57•VMAX ±3.5% (0°C to +60°C).
Internal 4 mW 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.
Automatic detection of safe pack conditions for recovery
    (MOSFET pair ON) from a fault condition (over/under
    discharged or overcurrent).
Average current drain = 1.2 µA typical.
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 not in use).
Over-current events cause connection of an internal 50 kW
   "FET-Bypass" resistance across OFF MOSFET
    pair. Loads >37 MW are required for return to conduction mode.
Over-charged states cause connection of a 5 kW
"Cell-Bypass" resistor to ensure that the cell is not
   allowed to be overcharged by leakage paths.

Pinout

Connection Diagram

Specifications

Maximum Input Supply Voltage
(VDD)
V+ or GATE or Full Pin Voltage
Enable or V− Pin Current
Power Dissipation (Note 2)
ESD Susceptibility
Human Body Model (Note 3)
Lead Temperature
(Soldering, 10s)

−0.3V to 5.5V
0.3V to VDD + 0.3V
±200 µA
Internally limited

2 kV

260°C

Description

The LM3641 Lithium Protection Integrated Circuit resides inside 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 electrical over-stress.

The LM3641 compares the cell voltage against internally programmed minimum and maximum limits. Transient voltage faults of approximately 1.25 seconds are tolerated. The IC also monitors the bi-directional current flow in the battery pack by measuring the voltage across a robust 4 mW current sensing resistor internal to the protection IC package.

The LM3641 turns OFF the MOSFET pair whenever any fault limit is exceeded. Momentary current surges <4 ms are tolerated. The Enable pin allows external ON/OFF control of the MOSFET pair and resets the IC after the MOSFET pair is turned OFF and the pack is safe to operate again.

The limits for overcharge and overdischarge voltage, as well as independent limits for each direction of overcurrent are factory adjusted employing EEPROM.

LM3641

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