Daniel,
For Si2333 I there are also two types available, http://www.vishay.com/search?query=si2333&decoded-part=&x=0&y=0, and Vishay recommends using the new CDS type in preference to the old DS type.
So is the circuit of TPS65070 also designed such that either DS or CDS type of Si2333 would work?
Zheng