Two/Three/Four-Phase  Buck CPU Controller

   The NCP5314 provides full−featured and flexible control for the latest high−performance CPUs. The IC can be programmed as a two−, three− or four−phase buck controller, and the per−phase switching frequency can be as high as 1.2 MHz. Combined with external gate drivers and power components, the controller implements a compact, highly integrated multi−phase buck converter.

FEATUREs
• Switching Regulator Controller
   ✦ Programmable 2/3/4 Phase Operation
   ✦ Lossless Current Sensing
   ✦ Enhanced V2 Control Method Provides Fast Transient Response
   ✦ Programmable Up to 1.2 MHz Switching Frequency Per Phase
   ✦ 0 to 100% Adjustment of Duty Cycle
   ✦ Programmable Adaptive Voltage Positioning Reduces Output
      Capacitor Requirements
   ✦ Programmable Soft−Start
• Current Sharing
   ✦ Differential Current Sense Pins for Each Phase
   ✦ Current Sharing Within 10% Between Phases
• Protection Features
   ✦ Programmable Pulse−by−Pulse Current Limit for Each Phase
   ✦ “111110” and “111111” DAC Code Fault
   ✦ Latching Off Overvoltage Protection
   ✦ Programmable Latching Overcurrent Protection
   ✦ Undervoltage Lockout
   ✦ External Enable Control
   ✦ Three−State MOSFET Driver Control through Driver−On Signal
• System Power Management
   ✦ 6−Bit DAC with 0.5% Tolerance Compatible with VR(M)10.x
      Specification
   ✦ Programmable Lower Power Good Threshold
   ✦ Power Good Output