The architecture of the TPS62A03 allows use of tiny ceramic-type output capacitors with low equivalent series resistance (ESR). These capacitors provide low output voltage ripple and are thus recommended. To keep resistance up to high frequencies and to achieve narrow capacitance variation with temperature, TI recommends to use X7R or X5R dielectric.

The input capacitor is the low impedance energy source for the converter that helps provide stable operation. TI recommends a low-ESR multilayer ceramic capacitor for best filtering. For most applications, a 4.7μF input capacitor is sufficient; a larger value reduces input voltage ripple.

The TPS62A03 is designed to operate with an output capacitor of 22μF to 47μF, depending on the selected output voltage, as outlined in Section 8.2.2.2.

A feedforward capacitor reduces the output ripple in PSM. The capacitance has to be selected such that enough phase margin is available for stability. Smaller capacitance of the forward capacitor results in larger phase margin but also in larger ripple. Good starting points for capacitor values at a VIN of 5V are 10pF for VOUT = 3.3V, 15pF for VOUT = 1.8V, and 22pF for VOUT = 1.2V.