A good PCB layout for the MP3412EJ-LF-Z should minimize the loop area of the power traces, keep the input and output capacitors close to the IC, and use a solid ground plane to reduce noise and EMI.
To ensure stability, make sure to follow the recommended component values and PCB layout guidelines. Additionally, ensure that the output capacitor has a low ESR and is properly decoupled from the output voltage.
The maximum input voltage for the MP3412EJ-LF-Z is 28V, but it's recommended to keep the input voltage below 24V for optimal performance and reliability.
While it's possible to use a different inductor value or type, it's not recommended as it may affect the performance and stability of the converter. The recommended inductor value and type are carefully selected to ensure optimal performance and efficiency.
The output voltage ripple and noise can be calculated using the equations provided in the datasheet. Additionally, the output voltage ripple can be measured using an oscilloscope and a voltage probe.