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TPS53915: Enable pin max voltage

Part Number: TPS53915

Hi,

just realized the maximum voltage on the EN pin is stated to 7.7V in datasheet.
We have been using using 10kOhm PU to 12V for multiple units for a few months now and just recently ordered new PBAs with the same design.

Any chance the EN pin has a quite large design margin so 12V via 10kOhm resistor will not damage the device?

  • Hi Andreas,

    We can only guarantee the device reliability within the ABS MAX limits. 

    You said you've been using this design for a few months now, have you had any issues with damaging the EN pin?

    The 10kOhm resistor may be providing enough protection to the EN pin by limiting the current. I would still recommend having a resistor to GND at EN pin to drop the voltage down.

    If you measure the DC voltage at the EN pin when VIN is applied, what is it reading?

    Thanks,

    Joseph

  • Hi Joseph,

    thank you for your response.

    We have so far not seen any issues with the device.
    The DC voltage at the EN pin is 11.9V when VIN is applied.

    Cheers
    Andreas

  • Hi Andreas,

    Glad to hear there have been no issues.

    As I said, we can't guarantee the device reliability above the ABS Max rating. However, it seems in your case the the risk is lower because of the 10kOhm resistor, if EN pin did get damaged and shorted, there would be the 10kOhm resistor to protect against it.

    If you make another board revision, I recommend adding another resistor to divide the EN pin voltage.

    Thanks,

    Joseph

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