The FAN50FC3 device is a multi-phase buck switching regulator controller optimized to convert a 12V input supply to the processor core voltage required by high-performance Intel® processors. It has an internal, 8-bit DAC that converts a digital voltage identification (VID) code sent from the processor, to set the output voltage between 0.5V and 1.6V in 6.25mV steps. It outputs PWM signals to external MOSFET drivers that drive the switching power MOSFETs. The switching frequency of the design is programmable by a single resistor value and the number of phases can be programmed to support 2- or 3-phase applications

The FAN50FC3 also includes programmable no-load offset and droop functions to adjust the output voltage as a function of the load current, as required by the Intel® specifications. The FAN50FC3 also provides an accurate and reliable short-circuit protection function with an adjustable over-current set point

FastvCore™ technology greatly improves the fast transient response required by today’s high-performance processors. This allows fewer output capacitors to be used in the application.

The FAN50FC3 is specified over the commercial temperature range of 0°C to +85°C and is available in a 32-lead MLP package.

• FastvCore™ nonlinear control for fast transient and to minimizes the number of output caps required
• Selectable 2- or 3-phase operation at up to 1MHz per phase
• ±7.7mV worst-case differential sensing error over temperature
• Active current balancing between output phases
• Power Good and Crowbar blanking supports on-the-fly VID code changes
• 0.5V to 1.6V output
• Usable for Intel® VR10 and VR11 designs
• Selectable VR10 extended (7-bit) and VR11 (8-bit) VID tables
• Programmable soft-start ramp
• Programmable short-circuit protection and latch-off delay

• Desktop PC/Server processor power supplies for existing and next-generation Intel® processors
• VRM modules