CHL8318_15 Datasheet, PDF (1/4 Pages) International Rectifier – DIGITAL MULTI-PHASE BUCK CONTROLLER

PRODUCT BRIEF
CHL8318
DIGITAL MULTI-PHASE BUCK CONTROLLER
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
RCSP
RCSM
VCC
VCPU
VRTN
SADDR/
GAMER_OFF
IMON
RRES
VINSEN
TSEN1
TSEN2
TSEN3
EN
V18A
56 55 54 53 52 51 50 49 48 47 46 45 44 43
1
42
2
41
3
40
4
39
5
CHiL
38
6
CHL8318
56 Pin
37
7
8mmx8mm
36
8
QFN
35
9
TOP VIEW
34
10
33
GND
11
32
12
31
13
30
14
29
15 16 17 18 19 20 21 22 23 24 25 26 27 28
IRTN8
ISEN8
VCC
PWM8
PWM7
PWM6
PWM5
PWM4
PWM3
PWM2
PWM1
NC
VCC
VAR_GATE
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 non-
linear 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
Figure 1. CHL8318 56 Pin QFN Package
Trademarks and registered trademarks are the property of the respective
owners.
PB0006 Rev. 1.00, October 26, 2009
Page 1 of 4
One Highwood Drive, Tewksbury, MA 01876
Tel: [phone]
www.chilsemi.com
© 2009 CHiL Semiconductor Corp. All rights reserved