9.2.3.3 Setting Output Voltage Ramp Time (T_dVdT)

For a successful design, the junction temperature of device must be kept below the absolute maximum rating during both dynamic (start-up) and steady state conditions. Dynamic power stresses often are an order of magnitude greater than the static stresses, so it is important to determine the right start-up time and in-rush current limit required with system capacitance to avoid thermal shutdown during start-up with and without load.

The required ramp-up capacitor C_dVdT is calculated considering the two possible cases (see Case 1: Start-Up Without Load. Only Output Capacitance COUT Draws Current and Case 2: Start-Up With Load. Output Capacitance COUT and Load Draw Current).