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TLV7031: voltage at in+ and in- without supply voltage

Prodigy 190 points

Replies: 4

Views: 72

Part Number: TLV7031

Hi,

is it allowed if the supply voltage of the TLV7031 (3.3V) is turned off and there is still a voltage at the in+ and in- inputs (e.g. 5V)?

it's no problem for me if the output is not defined but the the TLV should not be damaged

thanks

chris

  • Hi Chris,

    You won't harm the device as long as you don't exceed 7V on the input with the supply being 0V. I've attached some of the important sections from the datasheet.

    Regards,

    Joe

  • In reply to Joe Vanacore:

    Hi Chris,

    I would just like to add that while the device can tolerate a 5V difference on the inputs without a supply, it is not recommended. I presume you are talking about a minor period where this condition occurs. The device can tolerate this condition but should operate in the recommended input voltage range.

    Thanks,

    Joe

  • In reply to Joe Vanacore:

    Hi joe,

    thank you for the information.

    Actually the period where the device isn't supplied is always a very long period (e.g. 1 hour off and the 10min on) because this is the time where we want to safe power. But in the period where the device isn't powered i don't care about the output. Important for me is that the device isn't damaged.

    BG

    Chris

  • In reply to Christoph50:

    Hi Chris,

    Based on your usage case, I would recommend looking into the TLV3701 and the TLV4021. Both of these parts are specified to perform like your design requires. The TLV4021 has an internal reference of 1.2V and the TLV3701 has no internal reference.

    TLV3701 Recommended Input Voltage:

    TLV4021 Input Voltage:

    In the meantime, I am going to take a couple of days to look into using the TLV7031 for this type of usage. 

    Regards,

    Joe

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