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TPS7A4501-SP: SHDN Pin

Part Number: TPS7A4501-SP

Hi,

Could you comment on the behavior of the regulator if the SHDN pin is driven prior to the application of VIN? Would this cause a damage condition to the regulator? If this condition was repeated, would there be a concern of long term damage to the part? Is there a voltage threshold for what the regulator can handle between VIN and SHDN?

Thank you.

  • Hi Brad,

    I will consult with design on it and then provide you feedback.
  • Brad,

    Can you clarify / elaborate you question " Is there a voltage threshold for which the regulator can handle between Vin and SHDN? "
  • Hi Ramesh,
    The concern would be that VIN is ~0V and SHDN is driven (let’s say by 3.3V or 5.0V logic). I’m wondering if there is a relationship that must be maintained between the input and SHDN or if VIN must always be present to have a potential on SHDN.

    Thank you.
  • Hi Brad,

    1. if the SHDN pin is driven prior to the application of VIN? Would this cause a damage condition to the regulator? (RK) No there wont be any damage.
    2. If this condition was repeated, would there be a concern of long term damage to the part? (RK) no long term damage concern

    3. Is there a voltage threshold for what the regulator can handle between VIN and SHDN?
    (RK) Vin and SHDN work independently. Thus no concern with regards to having voltage on VIn to have potential on SHDN.
    When SHDN is driven, device will never be alive no matter what the Vin is. Thus no relationship is needed between Vin and SHDN .