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!
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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