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LM3641 - Lithium-Ion Battery Pack Protection Circuit

General 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).

Key Features

  • n Automatic battery disconnect when the cell is over-charged or over-discharged. 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.
  • VMAX ± 3.5% (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 si.

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The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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LM3641 Lithium-Ion Battery Pack Protection Circuit January 1999 LM3641 Lithium-Ion Battery Pack Protection Circuit General 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 IC compares the cell voltage against internally programmed minimum and maximum limits. Transient voltage faults of approximately 1.25 seconds are tolerated.