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LM5575-Q1: Connection of Exposed Pad For a Negative Supply

David Sackmann
Prodigy 60 points
Part Number: LM5575-Q1


I have completed a Webench design for a -15 V supply.  See Q3 -15V LM5575 POL.  It does not show the exposed pad connection.  Can it be connected to the input power common.  That would provide the best heat sinking.

  • 0
    TI__Guru 74155 points

    Hello

    For an IBB the exposed pad must be connected to the negative output voltage node.  It is a ground pin of the IC.  So, like the other ground pins of the IC it must be

    connected to the negative output voltage of the IBB.  You can increase the area of the negative output plane on the PCB to provide better heat sink are.

    Please see the attached application note for more information about using a buck as an IBB.

    Thanks

    2133.snva856a.pdf