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TPS22916: Auick discharge of TPS22916

takahiko yokota
Mastermind 7135 points
Part Number: TPS22916

Hi

Please let me ask you a question about TPS22916 just in case.
I think this device has quick output discharge.
Does this function operate under disabled and no input?

Best regards,
Yokota
  • 0
    TI__Genius 10855 points
    Hi Yokota-san,

    Thanks for reaching out on E2E!

    If VIN is removed or left floating, the QOD function will not work. VIN must be present to enable the QOD functionality.

    Thanks,

    Arthur Huang
  • 0 in reply to Alpha H
    Mastermind 7135 points

    Hi Huang-san

    Thank you for the reply.
    Are there the load SW to be able to operate under disable and no Vin?

    Best regards,
    Yokota

  • 0 in reply to takahiko yokota
    TI__Genius 10855 points

    Hi Yokota,

    The QOD functionality consists of an internal FET which is driven by VIN. With low VIN, Vgs becomes low, so the RQOD becomes higher. You can refer to Figure 8 in the TPS22916 datasheet for more information. 
    If VIN decays quickly to less than 1V, then the QOD functionality cannot be guaranteed, since the resistance could be infinite. If VIN decays slowly and remains above 1V while decaying, then the QOD functionality will work and could discharge the output. 

    In general, our load switches need VIN to be present for QOD to function. 

    Thanks,

    Arthur Huang