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TPS5461X系列的芯片PCB布局

Other Parts Discussed in Thread: TPS75003

TPS5461X系列的Thermal pad,就是底部的中间那块焊盘在PCb布局时要连AGND吗,还要打孔吗,我看手册上是要打的,但是我从官网下载的PCb封装就没有打孔,打孔是不是为了散热啊,请详细解答一下,谢谢