11.1 Layout Guidelines
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 pin out allows to connect tiny components such as 0201 (0603) size capacitors and 0402 (1005) size inductor. A solution size smaller than 5mm2 can be achieved with a fixed output voltage.
- As for all switching power supplies, the layout is an important step in the design. Care must be taken in board layout to get the specified performance.
- 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 IC's VIN and GND pins. This is the most critical component placement.
- 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 (e.g. SW line) or other noise sources.