LM7480-Q1: Could VS pin be powered separately to save power consumption?

Part Number: LM7480-Q1
Other Parts Discussed in Thread: LM74800-Q1

Tool/software:

Hi Team, 

In schematic below, LM7480-Q1 is used to drive Q1. And the Vout2 will be a fewer lower than VBAT.

So customer wonder if Vout2 can be used to drive Vs pin of LM7480-Q1 for Q1 to save power consumption even it may just save a little.

Thank you!

Marc