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TS5A3159A: Powered-off protection and absolute maximum rating

Taketo Sato
Genius 9805 points
Part Number: TS5A3159A

Hello team,

TS5A3159A supports Powered-off protection so I think the device is protected even if a signal, for example 3.3V is applied to COM pin when there is no power supply to the device(V+).

It looks to me that the device could support the condition because test condition of ICOM(PWROFF) spec shows also up to 5.5Vcom.

However, its absolute maximum rating says COM pin needs to be lower than V+ +0.5V.

Therefore, the device cannot support below use case(V+ is come when COM pin has some signal), correct?

Please let me know if my understanding is wrong.

Best regards,

  • 0
    TI__Expert 3515 points

    Hi Taketo,

    You are correct, the TS5A3159A does have the powered off protection feature. We have an FAQ with a detailed explanation: [FAQ] Do I need powered-off protection?

    For ICOM(PWROFF), the spec says that the device can handle from 0V to 5.5V while V+ is 0V so there is not an abs max violation in your graph above. The abs max table needs to be updated so it is more clearly explained but your application should have no issues. There can be up to 5.5V on the COM/NC/NO pins when V+ is 0V and there will not be damage to the device.

    Thanks,
    Tyler

  • 0 in reply to Tyler McGuire
    TI__Genius 9805 points

    Hello Tyler-san,

    Thank you for your comment.

    As you explained I understand there is no issue when COM pin has signal(voltage) when V+=0V. However, my concern and what I would like to know is when V+ is not 0V and COM pin has signal or voltage on it during powering up the device. Is such condition also protected? or violation of abs max rating?

    Best regards,

  • +1 in reply to Taketo Sato
    TI__Expert 3515 points

    Hi Taketo-san,

    I understand the question now, ramping V+ while there is a voltage present on COM will not cause an issue either. The powered off protection feature protects the device in this case as well.

    Thanks,
    Tyler

  • 0 in reply to Tyler McGuire
    TI__Genius 9805 points

    Hello Tyler-san,

    That's nice feature. It would be helpful if you could revise abs max rating in its datasheet.

    Best regards,

  • 0 in reply to Taketo Sato
    TI__Mastermind 27973 points

    All,

    The absolute maximum conditions of the device must be respected at all times. Failure to do so can result in abnormalities in signal integrity when powering up/down the device while having analog signals present on the device channel, or could result in potential damage to the device.

    Regards,

    Tyler