XDP™ 12-phase hyper transient phase dual loop multiphase controller The XDP™ XDPE15254D is a hyper transient phase controller. Core voltage is provided by a multiphase buck converter with up to 12 synchronous-rectified channels in parallel, while a second loop provides voltage for the I/O. Any phase can be assigned to either loop, and the phase firing order is fully programmable to offer the ultimate in phase configuration flexibility.