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Original question:

TLV7031: IN+ and IN- voltage range

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

Christoph50
Prodigy 220 points
Part Number: TLV7031
Other Parts Discussed in Thread: TLV4021, TLV3701

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

  • 0
    TI__Genius 11935 points

    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

  • 0 in reply to Joe Vanacore
    TI__Genius 11935 points

    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

  • 0 in reply to Joe Vanacore
    Prodigy 220 points

    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

  • 0 in reply to Christoph50
    TI__Genius 11935 points

    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