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BQ77PL900, BQ77910 compatibility with Lithium Iron Phosphate

TIguru
Expert 1430 points
Other Parts Discussed in Thread: BQ77PL900

Team

  Are TI's BQ77PL900 and BQ77910 devices compatible with Lithium Iron Phosphate batteries?  If there is any literature available that contrasts Li-Ion and Li-Fe-Phosphate please point me to it. 

 

Thanks,

Enrique

  • 0
    TI__Guru 54715 points

    Either are compatible with Lithium Iron Phosphate batteries within their capabilities.

    The bq77PL900 would function as an AFE allowing a micro-controller to monitor voltages. It can take action for under voltage, over current and temperature which may be appropriate for the LiFePO4 cells, but would rely on the microcontoller to take action for over voltage since the over voltage range is higher than practical for the LiFePO4 cells.  For a non-micro over voltage response the system would need a separate protector for over-voltage. The micro and separate protector indicate a more complex system.

    The bq77910 overvoltage protection ranges include the typical LiFePO4 values, so it will support this cell type with a simpler circuit. It does not have a host mode or the AFE function.

    I'm not aware that we have a detailed explanation of various chemistries, most of our information will be specific to the IC devices. You should be able to find good information on the Internet, perhaps from educational institutions, battery suppliers or cell manufacturers who provide both conventional Lithium-ion and LiFePO4 cells.