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We use a couple of LTM4667/LTM4677 for our board which we want to cool with liquid.

We use a couple of LTM4667/LTM4677 for our board which we want to cool with liquid. Is it better to cool it though the PCB instead of the top? In the data sheet the thermal resistance looks still smaller on the bottom. Our proto board shows cooling through the bottom works fine, but if we can improve it we might place it on the top.