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LM5180-Q1: The power-up order of LM5180-Q1

takahiko yokota
Mastermind 7135 points
Part Number: LM5180-Q1

Hi

I got a question about LM5180-Q1 from my customer.
Could I inputted voltage to EN terminal before VIN terminal?
If it has the problems, what problem does it have?

Best regards,
Yokota
  • 0
    TI__Guru 69475 points

    In general you do not want to apply a voltage on the EN pin when there is no voltage on the VIN pin.

    There is the possibility that you will turn on a parasitic ESD diode on that pin.  

    If this is a requirement, you will need to limit the current with a resistor.  

    I would try to limit the current in the range of 100uA or so.

  • 0
    TI__Guru 66522 points

    Hi Yokota-san,

    Yes, you can set the EN voltage high prior to applying the input voltage.

    Regards,

    Tim