SLVSD02E March 2015 – August 2021 TPS65982
For all capacitances it is important to factor in DC voltage de-rating of ceramic capacitors. Generally the effective capacitance is halved with voltage applied.
VIN_3V3 is connected to VDDIO which ensures that the I/Os of the TPS65982’s will be configured to 3.3 V. A 1 µF capacitor is used and is shared between VDDIO and VIN_3V3. LDO_1V8D, LDO_1V8A, and LDO_BMC each have their own 1 µF capacitor. In this design LDO_3V3 powers the TPS65982’s external flash and various pull ups. A 10 µF capacitor was chosen to support these additional connections. VOUT_3V3 is not used in this design and capacitor is not needed.