ZHCSI09S June 2010 – August 2018 TPS65911
Because of the nature of the switching converter with a pulsating input current, a low ESR input capacitor is required for the best input-voltage filtering and to minimize the interference with other circuits caused by high input-voltage spikes. For the VCC1, VCC2, and VCCIO pins, 10 μF of input capacitance (after derating) is required for most applications. A ceramic capacitor is recommended to achieve the low ESR requirement. However, the voltage rating and DC-bias characteristic of ceramic capacitors must be considered. The input capacitor can be increased without any limit for better input-voltage filtering.
Use the correct value for the ceramic capacitor capacitance after derating to achieve the recommended input capacitance.