SC198A

13

PCB Layout Considerations

Poor layout can degrade the performance of the DC-DC

converter and can be a contributory factor in EMI prob-

lems, ground bounce, thermal issues, and resistive voltage

losses. Poor regulation and instability can result.

The following design rules are recommended:

Place the inductor and filter capacitors as close to the

device as possible and use short wide traces between

the power components.

Route the output voltage feedback path away from

inductor and LX node to minimize noise and magnetic

interference.

Use a ground plane to further reduce noise interference

on sensitive circuit nodes.

1.

2.

3.

Applications Information (continued)

VIN

GND

GND

GND

GND

LXA

LXB

VOUTA

VOUTB