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LMX2594EVM: Junction temperature

user5941540
Intellectual 280 points
Part Number: LMX2594EVM

Hi !

I would like to know the junction temperature for different ambient temperatures. I did some measurements using a thermocouple on the die, and using the thermal table on the datasheet and the application report linked (Semiconductor and IC package thermal metrics), it seems that I need to use the Junction-to-top characterization parameter. But with a value equal to 0.2°C/W, there is barely no difference betwen the junction temperature and the case (top) temperature.

Is therre a mistake with that value ? Or maybe I misunderstood the application report ?

Thanks

Stephane

  • 0
    TI__Mastermind 27581 points
    Stephanie,

    I'm not a thermal expert, but I see other devices with this value so I am inclined to think it is some sort of misunderstanding.

    I think that the Theta-JA or Theta-Jboard might be more useful. I know that the die temeperature gets more than 0.2 C hotter than ambient.

    Regards,
    Dean