The maximum input voltage that can be applied to the LTC3406 is 15V, but it's recommended to keep it below 12V for optimal performance and reliability.
To optimize inductor selection, consider the inductor's saturation current, DC resistance, and core material. A good starting point is to choose an inductor with a saturation current rating above the peak current of the converter, and a DC resistance that minimizes losses.
For optimal performance, keep the input and output capacitors close to the IC, and use a solid ground plane to reduce noise and EMI. Keep the switching node (SW) away from sensitive nodes, and use a Kelvin connection for the output voltage sense lines.
To compensate the LTC3406, use a Type II compensation network consisting of a series RC network (R1, C1) and a parallel RC network (R2, C2) connected to the COMP pin. The values of R1, C1, R2, and C2 depend on the specific application and can be calculated using the datasheet's compensation calculator.
The maximum output current capability of the LTC3406 is 2A, but it can be limited by the inductor saturation current, output capacitor ESR, and PCB thermal limitations.
LTC3406ABES5#TRMPBF datasheet
by Linear Technology
