FAN5029 8-Bit Programmable 2- to 5-Phase Synchronous Buck Controller
December 2005
FAN5029
8-Bit Programmable 2- to 5-Phase Synchronous
Buck Controller
Features
■
Selectable 2-, 3-, 4-, or 5-phase operation at up to
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Description
The FAN5029 is a highly efficient multi-phase synchro-
nous buck switching regulator controller optimized for
converting a 12V main supply into the core supply volt-
age required by high performance Intel processors. It
uses an internal 8-bit DAC to read voltage identification
(VID) code directly from the processor, which is used to
set the output voltage between 0.5V and 1.6V. It uses a
multi-mode PWM architecture to drive the logic-level out-
puts at a programmable switching frequency that can be
optimized for VR size and efficiency. The phase relation-
ship of the output signals can be programmed to provide
2-, 3-, 4-, or 5-phase operation, allowing for the construc-
tion of up to five complementary buck switching stages.
The FAN5029 also includes programmable no-load off-
set and slope functions to adjust the output voltage as a
function of the load current, so that it is always optimally
positioned for a system transient. The FAN5029 also pro-
vides accurate and reliable short circuit protection,
adjustable current limiting, and a delayed Power Good
output that accommodates on-the-fly output voltage
changes requested by the CPU.
FAN5029 is specified over the extended commercial
temperature range of 0°C to +85°C and is available in a
40-lead MLP package.
1 MHz per phase
±8 mV worst-case differential sensing error over
temperature
Logic-level PWM outputs for interface to external
high-power drivers
Active current balancing between all output phases
Built-in power good/crowbar blanking supports on-the-
fly VID code changes
Digitally programmable 0.5 V to 1.6 V output supports
both VR10 and VR11 specifications
Programmable short circuit protection with program-
mable latch-off delay
Applications
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Desktop PC/Server power supplies for next generation
Intel processors
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VRM modules
For more information, please contact
Ron Berthiaume at
ronald.berthiaume@fairchildsemi.com
Related Products
■
FAN5109MX
– Dual Bootstrapped 12V MOSFET Driver
■
FAN5068
– DDR-1/DDR-2 plus ACPI Regulator Combo
■
FAN5069
– PWM and LDO Controller Combo
■
FAN6520A
– Single Synchronous Buck PWM Controller
©2005 Fairchild Semiconductor Corporation
1
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FAN5029 Product Brief Rev. 1.0.0
FAN5029 8-Bit Programmable 2- to 5-Phase Synchronous Buck Controller
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PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet Identification
Advance Information
Product Status
Formative or
In Design
Definition
This datasheet contains the design specifications for
product development. Specifications may change in
any manner without notice.
This datasheet contains preliminary data, and
supplementary data will be published at a later date.
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changes at any time without notice in order to improve
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The datasheet is printed for reference information only.
Rev. I17
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FAN5029 Product Brief Rev. 1.0.0
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