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BQ77216: Recommended Resistance Values for FETs in BQ77216

Tom Tsao
Expert 1200 points
Part Number: BQ77216
Other Parts Discussed in Thread: BQ76952

Tool/software:

Hi E2E,

When pairing with the BQ76952, could you please provide the recommended resistance values for the six highlighted FETs?

Thanks!

  • 0
    TI__Mastermind 40130 points

    Hello Tom,

    The gate MOSFET resistors could be something like 10-kOhm. For the pull-downs, they should be decently large. But low enough that the gate-source voltage turns-off the MOSFET when it is pulled low.

    Now, ensure that the DOUT/COUT pins also connect to CFETOFF/DFETOFF, so that this will properly work.

    Best Regards,

    Luis Hernandez Salomon

  • 0 in reply to Luis H. S.
    Expert 1200 points

    Hello Luis,

    Could you also recommend the size and resistance value for the pull-down resistor?

    Thank you!

  • 0 in reply to Tom Tsao
    TI__Mastermind 40130 points

    Hello Tom,

    I would recommend to not use these pull-down MOSFETs and instead just use the CFETOFF/DFETOFF.

    There is no exact values recommended for these resistors. The pull-down could be relatively large to limit current flow through the gate-source zener diode. 

    Best Regards,

    Luis Hernandez Salomon