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CHL8266-CHL8266CRT
6 phase multiphase PWM controller for high efficiency graphics processor VR solutions
International
ait Rectifier
Digital Multi-Phase GPU Buck Controller
GHL8266
FEATURES
GPU-compliant Digital PWM Controller
Programmable l-phase to 6-phase operation
Configurable switching frequency from 200 kHz to
1MHz per phase with accuracy better than 2%
IR Dynamic Phase Control
l-phase to 2-phase PSI for Light Loads
Adaptive Transient Algorithm minimizes output
bulk capacitors
Enables Thermal Phase Balancing
SMBus interface for configuring and monitoring
Compatible with IR ATL Drivers and
Tri-state Drivers
Nine bytes of NVM storage available for
customer use
+3.3V supply voltage; ty-T to 859C Ambient
operation
RoHS Compliant, MSL level 1 package
APPLICATIONS
High performance GPU Voltage
Regulation solutions
High Current and High-Efficiency Applications
DESCRIPTION
The CHL8266 is a 6-phase digital synchronous buck
controller for regulation of high-performance GPU
platforms. The CHL8266 output VID table is fully compliant
with VR11.1 specifications.
The CHL8266 deploys a number of efficiency shaping
features. PSI can be programmed to be up to four phases
for optimum light-load efficiency, and the controller can
autonomously add/drop phases from mid to high and back
to mid current ranges to deliver 90+% efficiency across the
entire load range.
IR's unique Adaptive Transient Algorithm, based on non-
linear digital PWM algorithms, minimizes output bulk
capacitors.
CHL8266 supports NTC temperature sense to report
temperature and trigger VR HOT and OTP faults. Digital
thermal balancing allows proportional current imbalance
between phases.
The CHL8266 provides extensive OVP, UVP, OCP and OTP
fault protection. Device and fault configuration parameters
are easily defined using the IR Digital Power Design Center
(DPDC) GUI and stored in on-chip non-volatile memory
(NVM).
The 2-pin SMBus interface can be used to monitor a variety
of operating parameters on CHL8266 based VRs.
The CHL8266 truly simplifies VRD design and enables
fastest time-to-market with its "set-and-forget"
methodology.
BASIC APPLICATION
CHL8266
VR_RDY c)--- VR_RDY PWM1
VR_HOT# CH7 VR_HOT# IRTN1 Power t V_GPU
ENABLE 0—» ENABLE PWM2 Stage2 lo
SV_CLK 0—» SCL IRTN2
SV DIO O<—> SDA
- Power
Stage 5
Powe r
Stage 6
3.3V VCC
I PWM 1_L2
I ISENl L2
IRTNCL2
Figure 1: CHL8266 Basic Application Circuit
PIN DIAGRAM
48 47 46 45 44 43 42 41 40 39 38 37
RCSP 36 | VCC
RCSM as | PWM6
V00 34 " PWMS
CHL8266 33 | PWM4
VRTN 32 | PWM3
48 Pin
SADDR 7mmx 7mm 31 I PWM2
TP2 t2FN 30 | PWM1
RRES TOP VIEW 29 | NC
VINSEN 28 | vcc
TSEN 27 | NC
26 | VFLHOT
25 | VR_READY
13141516171819 20 2122 23 24
Figure 2: CHL8266 Package Top View
il October 12, 2011 I FINAL I V1.05
International
TOR Rectifier Digital Multi-Phase GPU Buck Controller
GHL8266
ORDERING INFORMATION
CHL8266 - Tape & Reel Qty mam
QFN 3000 CHL8266-CRT
T - Tape and Reel QFN 3000 CHL8266-xxCRT1
R- Package Type (DFN) Notes:
I. "xx" indicates customer specific configuration file.
C - Operating Temperature
(Commercial Standard)
XX - Configuration File ID
45 44 43 42
RCSP E 1
RCSM E 2
VCC E 3
VGPU l: 4 CHL8266
VRTN E 5 .
SADDR l: 6 7mexPt,m
TP2 E 7 QFN
RRES C 8 TOP VIEW
VINSEN E 9
TSEN E 10 GND
EN E 11
V18A E 12
13141516171819 20 2122 23 24
VR_HOT
VR_READY
Figure 3: CHL8266 Top View Enla rged
til October 12, 2011 I FINAL I v1.05
