8-Bit Programmable, 2- to 3-Phase, Synchronous Buck Controller
Selectable 2- or 3-phase operation at up to 1MHz
±7.7mV worst-case differential sensing error over
The FAN5033 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)
Active current balancing between the output phases
Power Good and Crowbar blanking supports
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
on-the-fly VID code changes
switching power MOSFETs. The switching frequency of
0.5V to 1.6V output
the design is programmable by a single resistor value.
The number of phases can be programmed to support
Fully compliant with the Intel® VR10 and VR11
two- or three-phase applications.
The FAN5033 also includes programmable no-load
Selectable VR10 extended (7-bit) and VR11 (8-bit)
offset and droop functions to adjust the output voltage
as awww.DataSheet4U.com function of the load current, as required by the Intel
Programmable soft-start ramp
Programmable short-circuit protection and
specifications. The FAN5033 provides an accurate and
reliable short-circuit protection function with an
adjustable over-current set point.
The FAN5033 is specified over the commercial
temperature range of 0°C to +85°C and is available in a
32-lead MLP package.
Desktop PC/Server processor power supplies for
existing and next-generation Intel processors
Part Number Temperature Range Pb-Free Package Type Packing Method Quantity
0°C to 85°C
Yes MLP-32 Tape and Reel 3,000 per Reel
Intel® is a registered trademark of Intel Corporation.
© 2007 Fairchild Semiconductor 2006
FAN5033 Rev. 1.0.0