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PRELIMINARY PRODUCT BRIEF CHL8100
DIGITAL MULTIPHASE BUCK CONTROLLER
FEATURES
• Intel VR11.1, VR11.0 compliant Digital PWM Controller
for multi-phase power conversion
• High performance, easy-to-use digital close loop
feedback using no external components
• Minimizes output bulk capacitors with Adaptive Digital
Control to regulate load transients
• Selectable from 2, 3 and 4 phase operation
• 200kHz to 1MHz configurable switching frequency,
accuracy better than 5%
• Configurable Load Line from 0 to 1.5mΩ
• Differential DCR current sensing
• Digital phase current balancing, DC and transients
• Configurable soft-start
• Digitally adjustable fault detection and protection: OVP,
UVP, OCP
• SMBus interface for configuring and monitoring
• +3.3V supply voltage.
• 0ºC to 85ºC operation
• PSI compliant to improve light load efficiency
• Highly accurate IMON output
• Compatible with many external MOSFET drivers - ODB
type, Tri-state type and CHiL proprietary fast Tri-level
DESCRIPTION
The CHL8100 is a digital mixed-signal multiphase
synchronous buck controller designed to power high
performance microprocessors. It supports core voltage and
load requirements for INTEL
processors. This controller IC is intended for VR designs
using up to four interleaved synchronous buck phases and
capable of delivering up to 150A. The switching frequency of
each phase can be digitally configured from 200 kHz up to 1
MHz.
The CHL8100 utilizes non-volatile memory (NVM) to store
device operating parameters in registers. Designers can
access, modify and store the parameters in the registers
using the CHiL Intuitive Power Designer (IPD) GUI via the
industry standard SMBUS interface. This reduces design
effort and provides flexibility in optimizing the VR design for
size, cost and efficiency. It also reduces the number of
package pins and external passives resulting in cost and
board space savings.
CHiL’s unique Dynamic Digital Control minimizes the VR
output bulk capacitors while ensuring the processors are
provided with the required tightly regulated core voltage
under all conditions. Fast response to load transients is
achieved by advanced proprietary non-linear digital PWM
control techniques. The controller incorporates accurate
phase current balancing and supports configurable overcurrent protection. The CHL8100 includes VR11.1 features
such as a fully compliant Power Status Indicator (PSI) mode
for improved light load efficiency and accurate current
monitor output (IMON).
The CHL8100 also provides configurable OVP, OCP, and
output UVP fault protection. These and other parameters
are easily defined using the CHiL IPD which allows design
engineers to simply input their calculated design values
following a set-and-forget approach.
®
VR11.1 and VR11.0
APPLICATIONS
Figure 1. CHL8100 QFN Package
Trademarks and registered trademarks are the property of the respective
owners.
Rev 0.97, May 2008
• Multiphase synchronous buck converter for desktop
computers using Intel® VR11.x microprocessors
• High efficiency and compact VRM
• High current DC/DC Converters
- 1 -
One Highwood Drive, Tewksbury, MA 01876
© 2008 CHiL Semiconductor Inc. All rights reserved
Tel: 978-640-0011
www.chilsemi.com
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PRELIMINARY PRODUCT BRIEF
FUNCTIONAL BLOCK DIAGRAM
CHL8100
DIGITAL MULTIPHASE BUCK CONTROLLER
Figure 2 . Simplified Block Diagram
- 2 - Rev 0.97, May. 2008
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