Digital Multi-Phase Buck Controller
October 12, 2011 | FINAL | V1.06
FEATURES
Intel VR11.x compliant Digital PWM Controller
Programmable 1-phase to 4-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 2-phase PSI for Light Loads
Adaptive Transient Algorithm minimizes capacitors
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
operation
RoHS Compliant, MSL level 1 package
APPLICATIONS
Intel® VR11.x CPU VRD and VRM; DDR Memory
High Performance Desktops, Servers and
Graphics Cards
Over-clocking and High-Efficiency Application
BASIC APPLICATION
Figure 1: CHL8314 Basic Application Circuit
DESCRIPTION
The CHL8314 is a 4-phase digital synchronous buck
controller for core regulation of high-performance Intel®
VR11.1 and VR11.0 platforms. The CHL8314 is fully
compliant with VR11.1 including Power Status Indicator
(PSI) and for improved light load efficiency and accurate
current output (IMON).
The CHL8314 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 CHL8314 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.
CHL8314 supports NTC temperature sense to report
temperature and trigger VR HOT and OTP faults. Digital
thermal balancing allows proportional current imbalance
between phases.
The CHL8314 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 CHL8314 based
VRs. The controller includes a unique sensorless and
lossless input current monitoring capability.
PIN DIAGRAM
SDA
NC
NC
EN
VRTN
RCSM
PSI#
NC
ISEN4
ISEN3
NC
VID0
VID1
VID2
VID3
VID4
VID5
VID6
VID7
VCPU
VCC
SCL
PWM4
IMON
VR_READY
IRTN3
IRTN4
NC
NC
RCSP
TSEN
VR_HOT
PWM3
VINSEN
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
40 39 38 37
36
35
4142
ISEN2
ISEN1
IRTN1
IRTN2
PWM2
PWM1
VAR_GATE
15
16
44 43
VCC
33
32
31
30
29
34
GND
SADDR/
GAMER_OFF
CHL8314
TOP VIEW
48 Pin
7mmx 7mm
QFN
Figure 2: CHL8314 Package Top View
