FEATURES

 Intel VR11.x compliant Digital PWM Controller

 Programmable 1-phase to 8-phase operation

 Configurable switching frequency from 200 kHz to

1MHz per phase with accuracy better than 2%

 Customized Digital Over-Clocking Features

o Easy-to-use SMBus Gamer command

o Gamer VID control up to 2.3V, Gamer Vmax,

VID Override or Track, Digital Load-Line Adjust,

Gamer OC/OVP, Gamer OFF pin, Gamer OTP

 CHiL Efficiency Shaping Features

o Variable Gate Drive

o Dynamic Phase Control

 1-phase to 4-phase PSI for Light Loads

 Adaptive Transient Algorithm minimizes output bulk

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 CHiL ATL Drivers and tri-state Drivers

 Nine bytes of NVM storage available for customer use

 +3.3V supply voltage; 0ºC to 85ºC Ambient operation

 RoHS Compliant, MSL level 1 package

DESCRIPTION

The CHL8318 is a 8-phase digital synchronous buck

controller for core regulation of high-performance INTEL®

VR11.1 and VR11.0 platforms. The CHL8318 is fully

compliant with VR11.1 including Power Status Indicator

(PSI) and for improved light load efficiency and accurate

current output (IMON).

The CHiL CHL8318 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”. Gamer Mode

features include Extended Gamer VID up to 2.3V with 6.25

mV resolution, Gamer Vmax, CPU VID Override or Track,

Digital Load-Line adjust, Gamer OC/OVP and Gamer OFF

pin.

The CHL8318 deploys a number of efficiency shaping

features. The CHL8318 can be configured to optimize

MOSFET gate drive versus load current, PSI can be

programmed to be up to four phases for optimum light-load

efficiency, and the controller can autonomously add/drop

phases in low-current and mid-current regions to deliver

90+% efficiency across the entire load range.

CHiL’s unique Adaptive Transient Algorithm, based on nonlinear digital PWM algorithms, minimizes output bulk

capacitors. Coupled inductor mode of operation allows two

phase PSI and add/drop of phases which are 180°out of

phase for further improvement in transient response and

form factor.

CHL8318 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 provides extensive OVP, UVP, OCP and OTP

fault protection. Device and fault configuration parameters

are easily defined using the CHiL Intuitive Power Designer

(IPD) 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 based

VRs. The controller includes a unique sensorless and

lossless input current monitoring capability.

The CHL8318 truly simplifies VRD design and enables

fastest time-to-market with its “set-and-forget” methodology

APPLICATIONS

 Intel® VR11.x CPU VRD and VRM; DDR Memory

 High Performance Desktops and Servers

 Over-clocking and High-Efficiency Applications