An internal LDO to supply the TPS552882-Q1 outputs regulated 5.2-V voltage at the VCC pin with 60-mA output current capability. When V_IN is less than V_OUT, the internal LDO selects the power supply source by comparing V_IN to a rising threshold of 6.2 V with 0.3-V hysteresis. When V_IN is higher than 6.2 V, the supply for LDO is V_IN. When V_IN is lower than 5.9 V, the supply for LDO is V_OUT. When V_OUT is less than V_IN, the internal LDO selects the power supply source by comparing V_OUT to a rising threshold of 6.2 V with 0.3-V hysteresis. When V_OUT is higher than 6.2 V, the supply for LDO is V_OUT. When V_OUT is lower than 5.9 V, the supply for LDO is V_IN. Table 7-1 shows the supply source selection for the internal LDO.

To minimize the power dissipation of the internal LDO when both input voltage and output voltage are high, an external 5-V power source can be applied at the VCC pin to supply the TPS552882-Q1. The external 5-V power supply must have at least 100-mA output current capability and must be within the 4.75-V to 5.5-V regulation range. To use an external power supply for V_CC, a resistor with proper resistance must be connected to the MODE pin.