FAN5033 Datasheet, PDF (1/39 Pages) Fairchild Semiconductor – 8-Bit Programmable, 2- to 3-Phase, Synchronous Buck Controller

January 2007
FAN5033
8-Bit Programmable, 2- to 3-Phase, Synchronous Buck Controller
Features
ƒ Selectable 2- or 3-phase operation at up to 1MHz
per phase
ƒ ±7.7mV worst-case differential sensing error over
temperature
ƒ Active current balancing between the output phases
ƒ Power Good and Crowbar blanking supports
on-the-fly VID code changes
ƒ 0.5V to 1.6V output
ƒ Fully compliant with the Intel^® VR10 and VR11
specifications
ƒ Selectable VR10 extended (7-bit) and VR11 (8-bit)
VID tables
ƒ Programmable soft-start ramp
ƒ Programmable short-circuit protection and
latch-off delay
Applications
ƒ Desktop PC/Server processor power supplies for
existing and next-generation Intel processors
ƒ VRM modules
Description
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)
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.
The number of phases can be programmed to support
two- or three-phase applications.
The FAN5033 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 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.
Ordering Information
Part Number Temperature Range Pb-Free Package Type Packing Method Quantity
FAN5033MPX
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
www.fairchildsemi.com