The architecture of the TPS6281x-Q1 allows the use of tiny ceramic output capacitors with low equivalent series resistance (ESR). These capacitors provide low output voltage ripple and are recommended. To keep its low resistance up to high frequencies and to get narrow capacitance variation with temperature, it is recommended to use dielectric X7R, X7T, or an equivalent. Using a higher value has advantages like smaller voltage ripple and a tighter DC output accuracy in power save mode. By changing the device compensation with a resistor from COMP/FSET to GND, the device can be compensated in three steps based on the minimum capacitance used on the output. The maximum capacitance is 470 µF in any of the compensation settings.
The minimum capacitance required on the output depends on the compensation setting as well as on the current rating of the device. TPS62810-Q1 and TPS62813-Q1 require a minimum output capacitance of 27 µF while the lower current versions TPS62812-Q1 and TPS62811-Q1 require 15 µF at minimum. The required output capacitance also changes with the output voltage.
For output voltages below 1 V, the minimum increases linearly from 32 µF at 1 V to 53 µF at 0.6 V for the TPS62810-Q1, the TPS62813-Q1 with the compensation setting for smallest output capacitance. Other compensation ranges, ranges for TPS62811-Q1 and TPS62812-Q1, or both are equivalent. See Table 9-1 and Table 9-2 for details.