The bootstrap diode needs to have sufficient voltage rating to block the power stage input voltage of the power converter for the synchronous buck application. Depending on the type of diode selected, series diodes are required if the power stage input voltage is high. As mentioned in Bootstrap Diode, the diode also needs to be able to handle the peak current during the gate driver startup, and exhibit a low forward voltage drop, low junction capacitance, and fast recovery time. Particularly at higher frequencies, a Schottky diode may be required. A 150V, 1A rated Schottky diode with 110pF junction capacitance is selected for the evaluation setup. Note that the diode selected for use in the evaluation is for laboratory testing only, and TI recommends selection of a diode that meets all of the system performance and radiation needs.