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TPS53319: Floating EN pin

Steve Widener
Genius 11010 points
Part Number: TPS53319

Will the TPS53319 be disabled in the case where the EN is left floating?

  • 0
    TI__Guru**** 191445 points
    Steve,

    Based on the designer’s comment, there is no internal pull-up/down. If left floating, it could (or might not) find its way to an enabled state. So, please don’t leave it floating. Yes, it needs to be externally controlled.
  • 0 in reply to JohnTucker
    TI__Genius 11010 points
    Thanks John, it would not be intentionally left floating. This is to cover a worst-case condition during manufacturing - if there were a solder problem, and the pin were left floating - the converter cannot come up without potentially damaging a very expensive & critical FPGA. The current power converter is being redesigned to mitigate that possibility.

    The specifications are 5V in, 3.3V out, 4A load @ 100C ambient.

    Do we have a converter or controller solution that would meet those general specifications & not turn on in the case of a floating EN pin?

    As for the TPS53319, there does seem to be hysteresis on the EN pin comparator (at least at the block diagram level), that can provide a weak pull-down - was that considered by the designer?