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LM5146-Q1: Layout query

Sandeep Varma
Prodigy 140 points
Part Number: LM5146-Q1
Other Parts Discussed in Thread: LM5146, LM5145

Tool/software:

Hi, 

I have query about recommend layout for DC DC converter. In pcb layout, what should be there below Switching node i.e. inner layers.?  I have gone through TI recommend layout which has ground plane below Switch node.

Due to pcb constraints, Is it ok to leave empty/void i.e. no copper plane below SW node and inductor? Will it have bad results? 

Thanks, 

P B S Varma. 

  • 0
    TI__Guru 67482 points

    Hi Sandeep,

    A GND plane below the inductor us typically recommended, although leaving a void on the second layer (directly below the component) is fine as well.

    I recommned using hte LM5145 and LM5146 EVMs as good layout templates - copy them as much as possible.

    Regards,

    Tim