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BQ76942: TS2 Pin leakage current

Fabio Gou
Expert 4445 points
Part Number: BQ76942

Could you pls help to explain "the weakly driven with a 5V level during shutdown"?
Is it current source or what？

The customer is also planning to use the BJT circuit as below.

But they are very concerned that the leakage current of BJT under some bad working condition, like high temperature/high humidity/BJT aging.

Then even 1uA leakage current will prevent the TS2 voltage from pulling up to 5V.

Could you pls help to explain the internal "weak driven circuit" in detail to remove their concern? Or it is actually true?

  • 0
    TI__Mastermind 42060 points

    Hello Fabio,

    I think it is very clear from the datasheet, it is a weak pull-up resistor  of 4.6MOhm to 5-V. 

    I would agree with them. If the leakage of the BJT is too large, it could potentially pull TS2 down, since it is weakly driven up. Ideally they would select a component with very low leakage currents to avoid this.

    Best Regards,

    Luis Hernandez Salomon