SNVS852D June 2012 – August 2018 LMZ20502
Start-up and shutdown of the LMZ20502 is controlled by the EN input. The characteristics of this input are found in the Electrical Characteristics table. A valid input voltage must be present on VIN before the enable control is asserted. The maximum voltage on the EN pin is 5.5 V or VIN, whichever is smaller. Do not allow this input to float.
The LMZ20502 features a current limit based soft-start, that prevents large inrush currents and output overshoots as the regulator is starting up. The peak inductor current is stepped-up in a staircase fashion during the soft start period. A typical start-up event is shown in Figure 10: