negative voltage psu on LTC3863

Please review 'Gate Driver Component Placement, Layout and Routing ' and 'PC Board Layout Checklist '. I would also recommend getting our DC1737A demo board and modifying it for your application. The demo board pcb layout is available online and is a good guide for your own layout.

Thanks, will do this. I notice that your board got 4 layers, is it necessary?

A careful 2 layer layout could be successful, but 4 layer is proven and better.

I did 4 and works fine, will conduct tests, in case of issues I let you know.

I did 4 and works fine, will conduct tests, in case of issues I let you know.