SLVSDA7E February 2017 – August 2019 TPS61178
The TPS61178x has an integrated bootstrap regulator, and requires a small ceramic capacitor between the BST pin and SW pin to provide the gate drive voltage for the high-side FET. The bootstrap capacitor is charged when the BST-SW voltage is below regulation. The value of this ceramic capacitor should be above 0.1 µF. A ceramic capacitor with an X7R or X5R grade dielectric with a voltage rating of 10 V or higher is recommended because of the stable characteristics over temperature and DC biased voltage.