The LMR60420 shuts
down most internal circuitry and both high side and low side power
switches connected to the switch node under any of the following
conditions:
EN is
below VEN-TH(R)
VIN is
below VINUVLO(R)
Junction
temperature exceeds TSD
Note that the above conditions have hysteresis. Also, PG
remains active to a very low input voltage,
VIN(PG-VALID).