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LP2951-Q1: The thermal resistance of LP2951-Q1

user6430477
Prodigy 60 points
Part Number: LP2951-Q1
Other Parts Discussed in Thread: LP2951

I have one question for thermal resistance from datasheet of LP2951,

From datasheet Rthja=55.7C/W<Rthjc=66.5C/W,I think Rthja should be bigger than Rthjc,so can you help me confirm it,TKS!


  • 0
    TI__Mastermind 37835 points

    Hello,

    Here is the explanation from a member of the thermal analysis team:

    This happens occasionally as the two tests are unrelated.  Theta-JA assumes a natural convection environment with a 4 layer PCB, so most of the heat is dissipated through the exposed pad and into the board.  Theta-JC (Top) assumes a 1 layer PCB with an infinite heat sink on top of the package designed to force all of the heat to the top of the package. 

    Best regards,

    Nick