SLVSE57C June 2017 – April 2018 TPS2595
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 CdVdT 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).