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BQ29330: LiFePO4

Slava Prokopii
Intellectual 2075 points
Part Number: BQ29330
Other Parts Discussed in Thread: BQ76920, BQ76925, BQ76942

Hello, team.

Can BQ29330 device be used to handle 3 or4 LiFePO4 batteries?

  • 0
    TI__Guru 54715 points

    Hi Slava,

    Yes, it could.  Note the specifications in the BQ29330 data sheet Electrical Characteristics "CELL VOLTAGE MONITOR" section.  The output for monitoring cells is analog with a negative gain slope and rather limited range.  The BQ29330 is an old part and relatively expensive. 

  • 0 in reply to WM5295
    TI__Intellectual 2075 points

    HI, thank you for fast reply.

    What the device would you suggest to use instead  of BQ29330 for LiFePO4?

  • 0 in reply to Slava Prokopii
    TI__Guru 54715 points

    Hi Slava,

    The BQ76925 is an analog output part which will support down to 3 cells. BQ76920 will support down to 3 cells, it has digital outputs, accuracy has a wide tolerance at low voltages.  BQ76942 will support down to 3 cells and has better accuracy.  All these have budgetary prices lower than BQ29330.  Like most semiconductors right now demand is high and stock may be depleted.   

    With 3 LiFePO4 cells check how far you will be pulling the cells down to check the parts for POR level when making a component selection.