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TPS5432: inductor selection

pragash sangaran78
Expert 2715 points
Part Number: TPS5432

TI webench designer calculated 2.7uH in order to convert 5V into 3.7V using TPS5432. unfortunately, I'm unable to source this inductor value in adequate quantity. can I split this inductor into two or three?

two inductor split

2.7nH = 1.3nH + 1.4nH

three inductor split

2.7nH = 1nH + 1nH + 0.7nH

or

2.7nh = 0.9nH + 0.9nH + 0.9nH

is it possible? 

  • 0
    Expert 2715 points

    I have never seen multiple inductors implemented for a regulator before. just trying to be creative to solve supply chain problems if possible. 

  • +1 in reply to pragash sangaran78
    TI__Expert 8106 points

    Hi Pragash,

    The important parameters while choosing an inductor is its peak current rating, DCR and saturation current. I do not see a concern in using a series configuration as long as equivalent inductance value is within the datasheet recommendations. Just make sure that the important parameters are aligned. I just want to highlight that the overall parasitics from the inductors + PCB for implementing such a design would be higher as compared to using a single inductor. Therefore, it would be good to have less of them. 

    Thanks!

    Best regards

    Sneha