PRODUCT BRIEF CHL8318
DIGITAL MULTI-PHASE BUCK CONTROLLER
Trademarks and registered trademarks are the property of the respective
owners.
PB0006 Rev. 1.00, October 26, 2009
One Highwood Drive, Tewksbury, MA 01876
Tel: +1(978)-640-0011
www.chilsemi.com
© 2009 CHiL Semiconductor Corp. All rights reserved
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
SDA
PWM5
ISEN6
EN
VRTN
ISEN8
RCSM
PSI#
ISEN5
ISEN4
ISEN3
PWM6
PWM7
PWM8
VID0
VID1
VID2
VID3
VID4
VID5
VID6
VID7
VCPU
VCC
SCL
PWM4
IMON
VR_READY
IRTN3
IRTN4
IRTN6
IRTN5
RCSP
TSEN1
VR_HOT
PWM3
VINSEN
ISEN7
IRTN7
IRTN8
SALERT#
V18A
RRES
NC
VCC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
48
47 46 45
24
25
26
27
28
17
18
19
20
21
22
23
50
56
55
54
53
52
51
49
40
39
38
37
36
35
41
42
ISEN2
ISEN1
IRTN1
IRTN2
PWM2
PWM1
VAR_GATE
TSEN2
TSEN3
15
16
44 43
VCC
33
32
31
30
29
34
CHiL
CHL8318
GND
56 Pin
8mmx8mm
QFN
TOP VIEW
SADDR/
GAMER_OFF
Figure 1. CHL8318 56 Pin QFN 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 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
