NCP5391 2/3 Phase Buck Controllerfor VR11 Pentium IVProcessor ApplicationsThe NCP5391 is a two- or three-phase buck controller whichcombines differential voltage and current sensing, and adaptivevoltage positioning to power Intel's most demanding Pentium® IVProcessors and low voltage, high current power supplies. Dual-edgepulse-width modulation (PWM) combined with inductor currentsensing reduces system cost by providing the fastest initial responseto transient loads thereby requiring less bulk and ceramic outputcapacitors to satisfy transient load-line requirements.A high performance operational error amplifier is provided, whichallows easy compensation of the system. The proprietary method ofDynamic Reference Injection (Patented) makes the error amplifiercompensation virtually independent of the system response to VIDchanges, eliminating the need for tradeoffs between load transientsand Dynamic VID performance.