The TPS5420x has an integrated boot regulator and requires a 0.1-μF ceramic capacitor between the BOOT and SW pins to provide the gate drive voltage for the high-side MOSFET. A ceramic capacitor with an X7R or X5R grade dielectric is recommended because of the stable characteristics over temperature and voltage. This boot regulator has its own UVLO protection. This UVLO rising threshold is 2.1 V with a hysteresis of 100 mV. A 6-V bootstrap voltage is maintained between BOOT and SW when VVIN> 6 V.