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LM25117: Sense resistor location

Clayton Whitehead
Intellectual 350 points
Part Number: LM25117

How critical is the locating of the Sense resistor on the PCB layout?

Will being too close/too far have any detrimental impacts?

  • 0
    TI__Expert 6245 points
    Hello Clayton,

    When laying out your circuit’s power stage, the relative position of the FETs, the sense resistor, and the traces connecting the sense resistor to the LM25117 is more important than the proximity of the power stage to the LM25117.

    For a well-designed power stage, see Layout Guidelines in the datasheet. While less important than the construction of the power stage itself, proximity of the LM25117 to the power stage is also important. The power stage should be no more than 1 to 2 cm from the LM25117. Again, close is better.

    Regards, Robert