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LM5122: High Quiscent current LM5122

Mec DEv
Prodigy 40 points
Part Number: LM5122

1. We used LM5122 for input 12V and output : 12.3V.

2. WHen we connect input 12V we get 12.3V at the output. Issue is when no load is connected even then current drawn from supply is 170mA? What could be issue here?

We made schematic using Webbench only. 

  • 0
    TI__Guru 58471 points

    Hi Mec,

    thank you for using the E2E forum.

    When you probe the switch node SW, i assume you would still see some switching to get the input of 12 V to the output of 12.3 V.

    This is the main reason for the current you will see here. If you make the calculation of the switching losses for the FET that should you give a number close to the current you are measuring here.

    To get lower number you might can check for FET which have a lower gate charge.

    Best regards,

     Stefan

  • 0 in reply to Stefan Schauer
    TI__Guru 58471 points

    Hi Mec,

    i have not seen an update on this thread for the last 10 days.
    If the issue is sovled it would be great to press the is solved button.

    If there is still something open, just let me know with the new details.

    Best regards,

     Stefan