Typical application for FAN5333B
The FAN5333B is a boost converter.



It pulsates current trough the SW pin and uses the magnetic field in the inductor when SW is off to boost the voltage. It specifies a typical Vout of 30V, which is after the diode. The switch pin is allowed to go up to 35V, which it will. Since the SW voltage will pulsate.

This does not have an effect on Vin, except that the circuit draws high current in short pulses.
It has a 1.5MHz Switching Frequency, which requires tight board design.

ps: if you have not used buck or boost converters before, I suggest using a lower frequency to increase your success.