JAJST77 July 2024 TPS551892-Q1
PRODUCTION DATA
In buck mode, the input capacitor supplies high ripple current. The RMS current in the input capacitors is given by Equation 14.
where
The maximum RMS current occurs at the output voltage is half of the input voltage, which gives ICIN(RMS) = IOUT / 2. Ceramic capacitors are recommended for their low ESR and high ripple current capability. A total of 20µF effective capacitance is a good starting point for this application. Add a 0.1μF/0402 package ceramic capacitor and place it close to VIN pin and GND pin to suppress high frequency noise.