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

takahiko yokota

Part Number: LM5180-Q1

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

over 6 years ago

0 Frank De Stasi over 6 years ago

TI__Guru 74455 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 Timothy Hegarty over 6 years ago

TI__Guru* 76582 points

Hi Yokota-san,

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

Regards,

Tim

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