SNVSB32B August 2018 – June 2021 LM5146-Q1
PRODUCTION DATA
As mentioned previously, using one or more of the inner PCB layers as a solid ground plane is recommended. A ground plane offers shielding for sensitive circuits and traces and also provides a quiet reference potential for the control circuitry. Connect the PGND pin to the system ground plane using an array of vias under the exposed pad. Also connect the PGND directly to the return terminals of the input and output capacitors. The PGND net contains noise at the switching frequency and can bounce because of load current variations. The power traces for PGND, VIN and SW can be restricted to one side of the ground plane. The other side of the ground plane contains much less noise and is ideal for sensitive analog trace routes.