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TPS22924C: What is the input impedance of Switch Control Pin(C2) on TPS22924C (LOAD SWITCH) IC

venkatesh j
Prodigy 165 points
Part Number: TPS22924C
Other Parts Discussed in Thread: TPS3306

What is the input impedance of Switch Control Pin(C2) on TPS22924C (LOAD SWITCH) IC

  • 0
    TI__Genius 15780 points

    Hi Venkatesh,

    Can you please help us understand why this information is needed? The ON pin does not have any pull down circuitry to bring the pin voltage down. It is a high impedance pin, and the leakage current spec can be found in the datasheet.

    Thanks,

    Alek Kaknevicius

  • 0 in reply to Aleksandras_Kaknevicius
    Prodigy 165 points
    Hi Alek Kaknevicius,

    Thanks for your Response.
    I have comparator circuit with a pull up on output,which is being used to Enable the Load Switch.Also its being connected to Supervisory chip TPS3306 as well. Enable Pin impedance will come in parallel path,so want to know its impedance to make sure i don't see a drop in Suvervisory chip sense input(should not go below its threshold voltage) to raise false Reset.

    Regards,
    Venky
  • 0 in reply to venkatesh j
    TI__Genius 15780 points

    Hi Venky,

    The input impedance of the ON pin will be very high, in the range of megaohms. Another way to look at this is checking the max leakage current for the pin. At 3.6V, the max leakage current is specified as 0.1uA. By using R = V/I, the minimum impedance of the pin can be estimated as 36MΩ.

    Is this impedance acceptable?

    Thanks,

    Alek Kaknevicius