I have a basic question that hope someone can help me out.
When on a datasheet it is specified that RthJA = X degC/W on 1"sqr... does it imply that it is on a 1 layer board?.(CSD16411W3 is RthJA = 47degC/W)
The reason I'm asking is because on this paper http://www.nxp.com/documents/application_note/AN10874.pdf they show an improvement in temperature performance when using more than 1 layer and even better when using thermal vias to connect top and bottom layers.
If the datasheet number is assuming one layer then this numbers should be 40%-50% better if using this method (footprints are different but I think it should also apply).
Thanks in advance
Jaime