JAJSFJ1 May 2018 DLPA4000
PRODUCTION DATA.
Create a dedicated VIN path (in addition to an internal VIN plane) directly to the power blocks (Q11 and Q12) on the top layer of the board. Use 2 oz. (7 mm or larger) copper in the layout for VIN, the dedicated VIN return (bottom layer), and all other high-power nets. Tie the two planes at the input power connector only. This connection significantly reduces the 32-A switching noise from the power blocks on the internal VIN plane for the rest of the DLPA4000 integrated switching power supplies.