AM4376: What's purpose for 1.7V Vpp and requirement?

Part Number:AM4376

Hi,

   Customer designs TPS74801 for 1.7V Vpp, however, TLV707 is on ref. design. So what's purpose for this 1.7V Vpp and any special spec. requirment?

Is it power load or analog load concern about noise and PSSR?