At 1.0 A and 1.8 V_OUT, the dropout of the TPS748A-Q1 has a 105-mV maximum dropout over temperature; thus, a 300-mV headroom is sufficient for operation over both input and output voltage accuracy. At full load and high temperature on some devices, the TPS748A can enter dropout if both the input and output supply are beyond the edges of the respective accuracy specification.

To satisfy the required start-up time and still maintain low noise performance, a 10-nF C_SS is selected. Equation 8 calculates this value.

At the 1.0-A maximum load, the internal power dissipation is 0.3 W and corresponds to a 13.3°C junction temperature rise for the DRC package on a standard JEDEC board. With an 55°C maximum ambient temperature, the junction temperature is at 68.3°C.