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Stitching vias - how many? (density)

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If you increase the top heatsink area by moving the rest of the components down then you can dissipate 1W without overheating the transistor. Otherwise you can add say 4 0.5 mm dia pads under, or immediately around, the drain of the transistor. If you do this make sure these pads have soldermask stop specified, so you can fill them with solder. Not sure what you mean by drain out solder.

Won't the solder drain out through the vias so that there's not enough solder left to make good thermal contact with the pad?

Ah..no, surface tension will keep it in the vias.


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