The FAN5029 is a multi-phase buck switching regulator controller optimized to convert a 12V input supply to the processor core voltage required by highperformance Intel® processors. It has an internal 8-bit DAC that converts a digital voltage identification (VID) code that is sent from the processor to set the output voltage between 0.5V and 1.6V. It outputs a PWM to external MOSFET drivers that, in turn, 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-, 3-, 4-, or 5-phase applications.

The FAN5029 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 FAN5029 also provides an accurate and reliable short-circuit protection function with an adjustable over-current set point.

The FAN5029 is specified over the extended commercial temperature range of 0°C to +85°C and is available in a 40-lead MLP package.

• Selectable 2-, 3-, 4-, or 5-phase operation at up to 1 MHz per phase
• ±7.7 mV worst-case differential sensing error
• Active current balancing between all output phases
• Power good and crowbar blanking supports on-the-fly VID code changes
• Selectable VR10 extended (7-bit) and VR11 (8-bit) VID tables
• Programmable short-circuit protection with programmable latch-off delay
• Programmable soft start ramp

• Desktop PC/Server power supplies for next generation Intel processors
• VRM modules products