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TPS92630-Q1: FAULT/FAULT_S Driving capability

Umberto Frangi
Expert 4045 points
Part Number: TPS92630-Q1

Hi,

 I would like to know what are the values of internal pullup/pulldown on FAULT/FAULT_S pins.

 From the datasheet values probably they are about 1Mohm/10Kohm

We specify currents min/max to guarantee logic level for MCU, but I would like to drive with these pins an external P mosfet that needs to switch about 150mA.

Do you think these pins can do it or we need to add an additional circuitry/mosfet to guarantee this operation?

Thanks

Umberto

  • 0
    TI__Expert 5475 points
    Hi Umberto,

    The device has an internal weak pullup current and strong pulldown current, as specified in the datasheet. They are not resistors inside actually.
    I don't quite understand the external circuit you need to drive. Could you please describe it more clear? Thanks.

    Best Regards,
    Shirley He
  • 0 in reply to Shirley He
    TI__Expert 4045 points
    Hi Shirley,
    we need to drive with /FAULT output a device like BCR158(PNP), but when there is a fault on TPS92630( /FAULT is low) the BCR should be open/off.
    So I guess we need an external mosfet/transistor to invert polarity of the /FAULT output.
    For this reason I was asking driving capability.
    Thanks
  • 0 in reply to Umberto Frangi
    TI__Expert 5475 points
    Hi Umberto,

    The maximum pullup current of /FAULT is only 16uA. So it is not high enough to drive the external PNP. External pullup circuit with mosfet/transistor is needed.
    Thanks.