NC  -  Series DataSheet
NCP4200MNR2G  -  4 phase Vr11.1 controller with PMbus; Programmable Multi-Phase Synchronous Buck Converter with PMBus  -  ON Semiconductor  -  DC-DC Controllers

The NCP4200 is an integrated power control IC with a PMBus interface. It combines a highly efficient, multi−phase, synchronous buck switching regulator controller with a PMBus interface, which enables digital programming of key system parameters to optimize system performance and provide feedback to the system.
It uses an internal 8−bit DAC to read a Voltage Identification (VID) code directly from the processor, which is used to set the output voltage between 0.375 V and 1.6 V.
This device uses a multi−mode PWM architecture to drive the logic−level outputs at a programmable switching frequency that can be optimized for VR size and efficiency. The NCP4200 can be programmed to provide 2−, 3−, or 4−phase operation, allowing for the construction of up to four complementary buck−switching stages. The NCP4200 supports PSI, which is a Power Save Mode.
The NCP4200 includes a PMBus interface which can be used to program system set points such as voltage offset, load−line and phase balance and output voltage. Key system performance data, such as CPU current, CPU voltage, and power and fault conditions can also be read back over the PMBus from the NCP4200.
The NCP4200 is specified over the extended commercial temperature range of 0°C to +85°C and is available in a 40 Lead QFN package.

Features
• Selectable 2−, 3−, or 4−Phase Operation at Up to 1.5 MHz per Phase
• PMBus Interface − Enables Digital Programmability of Set Points and Read−back of Monitored Values
• Logic−Level PWM Outputs for Interface to External High Power Drivers
• Fast−Enhanced PWM for Excellent Load Transient Performance
• Active Current Balancing Between All Output Phases
• Built−In Power−Good/Crowbar Blanking Supports On−The−Fly (OTF) VID Code Changes
• Digitally Programmable 0.375 V to 1.6 V Output Supports Both VR11 and VR11.1 Specifications
• Programmable Short−Circuit Protection with Programmable Latchoff Delay
• Supports PSI – Power Saving Mode During Light Loads

Applications
• Desktop PC Power Supplies for VRM Modules