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LM3224 thermal resistance

Scott Kerstein
Expert 1395 points
Other Parts Discussed in Thread: LM3224, LM2936, LMH6643, LM4871, LM4923, LM2622

Hello,

I’m looking for the thermal resistance from junction to ambient (θja) of the LM3224. In the datasheet, it talks about using θja to calculate power, but it’s not called out anywhere. I need the info quickly because the customer is looking to add a load onto this power supply and I need to know whether it can handle it.

Thank you in advance,

Scott

  • 0
    TI__Guru 71526 points

    Hi Scott,

      Apparently the thermal characteristics were omitted during the datasheet conversion.  I looked at another device that uses the DGK0008A package, the LM2936, and that package has a thetaJA of 200C/W (see page 3).  As well the LM4871 is 210C/W (page 3), the LM4923 also 210C/W and the LMH6643 is 235C/W. 

    Since you need this ASAP, I would use the 210C/W for the ballpark calculation; I'll get a clarification tomorrow.   Also, when you find missing information in the datasheet, there is a Submit Feedback link at the bottom of each page, you can report these omissions there.

    -Leonard

     

  • 0 in reply to LeonardEllis
    Expert 1395 points

    Thanks, Leonard for the super quick response!

  • 0 in reply to Scott Kerstein
    TI__Guru 71526 points

      The LM3224 is basically the same die and package as the LM2622 with some added features.  As it turns out, the LM2622 datasheet has very clear ThetaJA information on page 5.  Use this for your calculations.

    -Leonard