MP2759 - What is the Purpose of Diode between Vin & PMID?

In the schematic, I see that there is a diode in between Vin and PMID. What is its purpose and is it required? I cannot seem to find it on the datasheet. Thanks.


The diode between VIN and PMID is there to protect Q1’s body diode against high current. Q1’s body diode isn’t capable of sustaining high current, especially in-rush. This diode allows VIN to share the input current path between the diode and the Q1 body diode.