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LM5022 junction to case thermal resistance

Allen Hunt
Prodigy 20 points
Other Parts Discussed in Thread: LM5022, LM5085

The datasheet lists the thermal resistance from junction to ambient but not the thermal resistance from junction to case. I need the thermal resistance from junction to case for the LM5022MM in the 10 pin VSSOP package.

Did not find this information in the forums either. The theta JC is needed for thermal simulation.

  • 0
    TI__Mastermind 26350 points

    Hi Allen,

    I am assuming that you are trying to estimate the temp rise of the package; excuse me if I am mistaken here?

    If my assumption is correct then please allow me to advise that the Junction to Ambient is inclusive of the Junction to case temp.  If you know what the watts loss is on the IC you simply multiply this number by the J-A to estimate temp rise.

    For example if the IC is dissipating 0.5W and you have a Theta J-A of 100C/W then the temp rise of the package can be estimated to be 50C above ambient.

    Hope this helps?

    David Baba.

  • 0 in reply to David Baba
    Genius 4015 points

    Hello, sorry for interrupting your communication on this thread.

    We have same inquiry regarding theta JC on LM5022 from our customer who is willing to estimate temp rise of the package.

    There are some other former NS devices which define theta JC on their datasheets.

    For example, when referring page 4 of LM5085 datasheet, theta JC for VSSOP (same package, but the number of pin is different) is 29C/W, meanwhile theta JA is 126C/W.

    We assume that the actual consideration for theta JC is different from your description above. 

    We thank you once again for your information.

    Best regards,