What is the function of the circuit including the components C4, D4, R1, R4 in STUSB4500 datasheet?

Aim of schematic is:

·        While stsub4500 is in explicit contract, if there is a current surge system, drop induced by surge will be absorbed by RC in order to avoid stusb4500 to disconnect due to UVLO.  

·        During VBUS voltage ramp up, there is no impact