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