FAIRCHILD’S FAN5031 device is a 2 to 4 phase buck switching regulator controller, which is optimised to convert a 12V input supply to the processor core voltage required by high performance Intel processors.
Available from Soanar Plus , it has an internal 8-bit DAC that sets the output voltage between 0.5V and 1.6V in 6.25 mV steps.
It outputs PWM signals to external MOSFET drivers that, in turn, drive the switching power MOSFETs.
The switching frequency, no-load offset, droop functions and several phases are all programmable.
The FAN5031 also provides an accurate and reliable short circuit protection function with an adjustable over current set-point.
The FAN5031 is specified over the commercial temperature range of 0°C to +85°C and is available in a 40-lead MLP package. It is also supported by high-end and low-end demo boards.
Features include:
* Selectable 2, 3, or 4 phase operation at up to 1MHz per phase
* ±7.7mV worst-case differential sensing error over temperature
* Active current balancing between the output phases
* Power good and Crowbar blanking supports on-the-fly VID code changes
* 0.5V to 1.6V output
* Fully compliant to both Intel's VR10 and VR11 specifications
* Selectable VR10 extended (7 bit) and VR11 (8 bit) VID tables
* Programmable soft start ramp
* Programmable short circuit protection and latch-off delay.