Two/Three/Four−Phase Buck CPU Controller
The NCP5318 provides full−featured and flexible control conforming to the Intel® VRM 10.1 specification for 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 1.0 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 1.0 MHz Switching Frequency Per Phase
✦ Programmable Adaptive Voltage Positioning
✦ Programmable Soft−Start Time
• Current Sharing
✦ Differential Current Sense Pins for Each Phase
✦ Current Sharing Within 10% Between Phases
• Protection Features
✦ Programmable Latching Overcurrent Protection
✦ “111110” and “111111” DAC Code Fault
✦ Latched Overvoltage Protection
✦ Undervoltage Lockout
✦ External Enable Control
✦ Three−State MOSFET Driver Control through DRVON Signal
• System Power Management
✦ 6−Bit DAC with 0.5% Tolerance Compatible with VRM 10.1
Specification
✦ Programmable Lower Power Good Threshold
✦ Power Good Output with Delay
✦ Pre−set No Load Offset Voltage
• Pb−Free Package is Available*