Lithium-ion Battery Pack Protection Circuit - National Semiconductor

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. The IC also monitors the bi-directional current flow in the bat- tery pack by measuring the voltage across a robust 4 m 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. 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. The limits for overcharge and overdischarge voltage, as well as independent limits for each direction of overcurrent are factory adjusted employing EEPROM By National Semiconductor Corporation
LM3641 's PackagesLM3641 's pdf datasheet



LM3641 Pinout, Pinouts
LM3641 pinout,Pin out
This is one package pinout of LM3641,If you need more pinouts please download LM3641's pdf datasheet.

LM3641 Application circuits
LM3641 circuits
This is one application circuit of LM3641,If you need more circuits,please download LM3641's pdf datasheet.


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