IL(OVL) is the short circuit shutdown threshold of PROFET+2 products. If the drain current of a PROFET+2 exceeds this threshold, a protective switch-off is triggered to avoid severe damage.
For supply voltages below VS(JS) (minimum 20.5V), this threshold is depending on the drain-source voltage. Very often, a high current is reached only when the output voltage is high and the drain source voltage is low. For VDS<13V, the short circuit threshold is IL(OVL0) (see datasheet P_8.7.x.1, P_8.7.x.7 and P_8.7.x.8 for limits at different temperatures).
In case a high load current is already flowing while the PROFET +2 has just started to turn on, the drain source voltage is still high and protective switch-off is triggered at lower IL(OVL1) threshold.
At high supply voltages, such as jump start, the drain source voltage may be high when enabling the output (rising edge on digital pin IN). For voltages higher than VS(JS) (typically 22V), this will trigger the lower threshold, which is described as IL(OVL_JS) in the datasheet.
