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TPS51206: S3 to be Open

tateo yamashiro
Guru 10890 points
Part Number: TPS51206

Hi,

We got a question from the customer about TPS51206.
Could you help us?

[Question]
- What is going to happen if S3 pin is to be open under the IC is operating? Is there concern to damage to the IC?
- Are there pull-down or pull-up resistor on S3 pin?

Best Regards,
tateo

  • 0
    TI__Mastermind 24075 points
    Hi Tateo,

    If S3 pin is open, the noise could be coupled to the pin and pull S3 pin high or low.
    S3 pin should be controlled by external voltage.

    Thanks
    Qian
  • 0 in reply to Qian Chen
    Guru 10890 points

    Hi, Thank you for your reply. We understand the S3 should be controlled by external voltage. But they need consider with the abnormal situation which S3 is open. So could you please confirm about below qestion?

    - When external voltage(including the noise) doesn't supply to S3, what is the behavior of the IC? Is there concern to damage to the IC?

    Best Regards,
    tateo

  • 0 in reply to tateo yamashiro
    TI__Mastermind 24075 points
    Hi Tateo,

    There is no internal pull-up or pull-down resistor on S3 pin.
    If S3 is totally open, the S3 pin voltage could be any voltage due to noise coupling.
    If the voltage is above ABS spec, pin damage may happen.

    If S3 is connected to external voltage and external voltage may be open in abnormal situation, I would suggest to add a resistor like 10k between
    S3 and ground. In that case, even external voltage is open, S3 pin voltage will be zero.

    Thanks
    Qian