A BOOT resistor can be connected between the CBOOT and RBOOT pins to slow the rise time of the SW node. If EMI performance is not critical, these two pins can be shorted. If EMI is critical, use a 0Ω placeholder. The value can be increased if additional EMI margin is required. Start with a 50Ω BOOT resistor as a first step. This increase slows the rise time of the SW node, reducing EMI at hundreds of MHz by a few dBµV. This action comes at the expense of slightly lower efficiency. In this example, 0Ω is chosen to maximize efficiency. The value of RBOOT can be increased to further improve high-frequency EMI emissions at the expense of lower efficiency. RBOOT connected to pins RBOOT and CBOOT can be any value between a short and an open without triggering BOOT UVLO.