The pinout of TPS6280x has been optimized to
enable a single top layer PCB routing of the IC and its critical passive components
such as CIN, COUT, and L. Furthermore, this pinout allows the
user to connect tiny components such as 0201 (0603) size capacitors and a 0402
(1005) size inductor. A solution size smaller than 5 mm2 can be achieved
with a fixed output voltage.
- As for all switching power supplies, the layout
is an important step in the design. Take care in board layout to get the specified
- It is critical to provide a low inductance, low impedance ground path. Therefore, use wide and short traces for the main current paths.
- The input capacitor should be placed as close as
possible to the VIN and GND pins of the IC. This is the most critical component
- The VOS line is a sensitive, high impedance line
and should be connected to the output capacitor and routed away from noisy components and
traces (for example, SW line) or other noise sources.