FAN5029 — 8-Bit Programmable 2- to 5-Phase Synchronous Buck Controller
January 2007
FAN5029
8-Bit Programmable 2- to 5-Phase Synchronous Buck Controller
Features
•
Selectable 2-, 3-, 4-, or 5-phase operation at up to
1MHz per phase
•
±7.7mV worst-case differential sensing error
•
Active current balancing between the 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 and latch-off
delay
•
Programmable soft start ramp
Description
The FAN5029 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 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.
Applications
•
Desktop PC/Server processor power supplies for
existing and next generation Intel processors
•
VRM modules products
Part Numbers
•
FAN5029MPX is not for new designs.
•
The FAN5029MPX_NAAC238 replaces the
FAN5029MPX and is compatible with all VR10 and
VR11 processors.
Ordering Information
Part Number
FAN5029MPX
FAN5029MPX_NAAC238
0°C to 85°C
MLP-40
Temperature
Range
Package
Type
Lead
Free
Yes
Packing Method
Quantity
per Reel
3,000
Not For New Designs
Tape and Reel
For more information, please contact Ron Berthiaume at
ronald.berthiaume@fairchildsemi.com.
© 2004 Fairchild Semiconductor Corporation
FAN5029 Rev. 1.1.3
www.fairchildsemi.com
FAN5029 — 8-Bit Programmable 2- to 5-Phase Synchronous Buck Controller
Block Diagram
Figure 1: Block Diagram
© 2004 Fairchild Semiconductor Corporation
FAN5029 Rev. 1.1.3
www.fairchildsemi.com
2
FAN5029 — 8-Bit Programmable 2- to 5-Phase Synchronous Buck Controller
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FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS
HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE
APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER
ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. THESE SPECIFICATIONS DO NOT EXPAND THE TERMS OF FAIRCHILD’S
WORLDWIDE TERMS AND CONDITIONS, SPECIFICALLY THE WARRANTY THEREIN, WHICH COVERS THESE PRODUCTS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR
SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION.
As used herein:
1.
Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body or
(b) support or sustain life, and (c) whose failure to perform
when properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to
result in a significant injury of the user.
2.
A critical component in any component of a life
support, device, or system whose failure to perform
can be reasonably expected to cause the failure of the
life support device or system, or to affect its safety or
effectiveness.
PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet Identification
Advance Information
Product Status
Formative or In
Design
First Production
Definition
This datasheet contains the design specifications for product
development. Specifications may change in any manner without
notice.
This datasheet contains preliminary data; supplementary data will
be published at a later date. Fairchild Semiconductor reserves the
right to make changes at any time without notice to improve design.
This datasheet contains final specifications. Fairchild
Semiconductor reserves the right to make changes at any time
without notice to improve design.
This datasheet contains specifications on a product that has been
discontinued by Fairchild Semiconductor. The datasheet is printed
for reference information only.
Rev. I22
Preliminary
No Identification Needed
Full Production
Obsolete
Not In Production
© 2004 Fairchild Semiconductor Corporation
FAN5029 Rev. 1.1.3
www.fairchildsemi.com
3
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