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TPS65131-Q1: Question on thermal information

Johnny Guo
Expert 4910 points
Part Number: TPS65131-Q1

Hi, team,

Just curious on TPS65131-Q1 thermal information, usually RthJA will be larger than RthJCtop, but in TPS65131-Q1 datasheet, RthJA < RthJCtop.

Could you help check for the reason on this?

Thanks.

Johnny

  • 0
    TI__Expert 4940 points

    Hi Johnny,

    I have notified our expert regarding this topic, Please expect a response by 6/12/20.

    Thanks,

    Costin

  • 0
    TI__Mastermind 18550 points

    Hi Johnny,

    I checked TPS65131-Q1 RGE (VQFN-24) and some other devices in the same package and it appears that for smaller VQFN packages, like the one for TPS65131-Q1, Theta-ja is slightly lower than Theta-jc. The likely reason for this is that the exposed thermal pad of these packages that attaches to a solid copper plane on the board provides a lower thermal resistance path from junction to surrounding ambient than from junction to case top. So the numbers in the datasheet are correct.

    Kind Regards,

    Liaqat