DP83867CS: Input Power Requirements

A customer is working on a design utilizing the DP83867CS Ethernet PHY, and he has a couple of questions:

1. He noticed the reference board uses an LDO to power it, but he would like to use a switching supply instead if possible. He was only able to find power consumption data but nothing related to the maximum allowable ripple. Would it be okay to use a switching power supply instead of an LDO and what would the ripple requirements be?
2. Similarly, he’d be interested if we have any data on power consumption with a SGMII interface utilizing the same PHY – he was only able to find SLNA241 but that covered RMGII at 1000BT.

Thanks!