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PMP10902: L1 (inductor) confirmation

Art Mecina
Genius 16585 points
Part Number: PMP10902

Hello Guys,

Good day.

Our customer is planning to replicate the PMP10902 design. They noticed that L1 and L2 are stacked-up (parallel) on top of each other on the schematic. However upon looking at the BOM, there is no value, package and manufacturer specified for L1. What is the reason for this? Should he make his design with footprint allocated for L1 on his PCB?

Thanks in advance!

Art

  • 0
    TI__Intellectual 820 points

    Hi,

    L2 was the inductor chosen for this reference design and is documented in the test report data. L1 is simply an alternative inductor footprint, overlaid on top on L2, in case it was decided to use a larger package. This adds flexibility in the PCB layout, such that it can easily accommodate a slightly larger package without modifying the PCB. This may be done if it was determined that the temperature rise of the smaller inductor were too high or if higher converter efficiency were desired - typical trade-offs that often occur during the initial design and testing phase. In this case, the smaller inductor were deemed sufficient. It is not necessary to change L2 to L1, but can certainly be done if desired. Simply chose an IHLP5050 type (or any other vendor) with the same inductance and RMS/ISAT current rating (or higher).  

    regards,

    John Betten