Digital Multi-Phase Buck Controller CHL8318-20
Intel VR11.x compliant Digital PWM Controller
Programmable 1-phase to 8-phase operation
Customized Digital Over-Clocking features an
easy-to-use SMBus Gamer command and a
Gamer VID control up to 2.3V, Gamer Vmax,
VID Override or Track, Digital Load-Line Adjust,
Gamer OC/OVP, Gamer OFF pin and Gamer OTP
IR Efficiency Shaping features a Variable Gate Drive
and Dynamic Phase Control
1-phase to 4-phase PSI for Light Loads
Adaptive Transient Algorithm minimizes capacitors
Designed for use with coupled inductors
Enables Thermal Phase Balancing
SMBus Fault Indicators: OVP, UVP, OCP, OTP
SMBus interface for configuring and monitoring;
SMBus commands include monitoring input
current and power
Compatible with IR ATL Drivers and tri-state Drivers
9 bytes of NVM storage available for customer use
+3.3V supply voltage; 0ºC to 85ºC Ambient
RoHS Compliant, MSL level 1 package
Intel® VR11.x CPU VRD and VRM; DDR Memory
High Performance Desktops and Servers
Over-clocking and High-Efficiency Application
The CHL8318-20 is an 8-phase digital synchronous buck
controller for core regulation of high-performance Intel®
VR11.1 and VR11.0 platforms. The CHL8318-20 is fully
compliant with VR11.1 including Power Status Indicator
(PSI) and for improved light load efficiency and accurate
current output (IMON).
The IR CHL8318-20 includes a customized set of digital
over-clocking features which require no external
components. Gaming applications can use the SMBus
interface to place the VRD into “Gamer Mode” to extend
VID up to 2.3V with 6.25 mV resolution.
The CHL8318-20 deploys a number of efficiency shaping
features such as variable MOSFET gate drive versus load,
programmable PSI modes for optimum light-load along
with programmable phase shedding to autonomously
add/drop phases versus load.
CHL8318-20 supports three NTC temperature sensors to
report temperature and trigger VR HOT and OTP faults.
Digital thermal balancing allows proportional current
imbalance between phases.
The CHL8318-20 provides extensive OVP, UVP, OCP and
OTP fault protection. Device and fault configuration
parameters are easily defined using the IR Power Designer
GUI and stored in on-chip non-volatile memory (NVM).
The 3-pin SMBus interface can be used to monitor a variety
of operating parameters on up to seven CHL8318-20 based
VRs. The controller includes a unique sensorless and
lossless input current monitoring capability.
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Figure 1: CHL8318-20 Basic Application Circuit
1 September28, 2011 | FINAL | V1.02
Figure 2: CHL8318-20 Package Top View