PRODUCT BRIEF CHL8225/CHL8228
DIGITAL MULTI-PHASE BUCK CONTROLLER
Trademarks and registered trademarks are the property of the respective
owners.
PB0008, Rev 1.0, June 11, 2010
- 1 -
One Highwood Drive, Tewksbury, MA 01876
Tel: +1(978) 640-0011
www.chilsemi.com
© 2010 CHiL Semiconductor Corp. All rights reserved
FEATURES
5-phase & 8-phase dual output PWM Controller with
phases flexibly assigned between Loops 1 & 2
Dynamic voltage control by 2-bit parallel interface with
Gamer Mode override and Vmax setting
Input Voltage Management for up to 3 Input Voltages
ICRITICAL Monitor and Phase Current Capture Mode
Phase Switching frequency from 200kHz to 1.2MHz
CHiL Efficiency Shaping Features including Variable
Gate Drive, Dynamic Phase Control
Programmable 1-phase or 2-phase for Light Loads and
Active Diode Emulation for Very Light Loads
CHiL Adaptive Transient Algorithm (ATA) minimizes
output bulk capacitors and system cost
Designed for use with coupled inductors
Per-Loop Fault Protection: OVP, UVP, OCP, OTP
I2C/SMBus/PMBus system interface for telemetry of
Temperature, Voltage, Current & Power for both loops
Non-Volatile Memory (NVM) for custom configuration
Compatible with CHiL ATL and 3.3V tri-state Drivers
+3.3V supply voltage; 0ºC to 85ºC ambient operation
Pb-Free, RoHS, 6x6 40pin & 8x8 56pin QFN packages
DESCRIPTION
The CHL8225/8 are dual-loop digital multi-phase buck
controllers. The CHL8225 drives up to 5 phases and the
CHL8228 drives up to 8 phases. They feature Input Voltage
Management allowing up to 3 input voltages to be
monitored to ensure adequate power is delivered to the
load. Dynamic voltage control is provided by 4 registers
which are programmed through I2C/SMBus/PMBus and
then selected using a 2-bit parallel bus for fast access.
The CHL8225/8 NVM saves pins and enables a small
package size.
The CHL8225/8 includes the CHiL Efficiency Shaping
Technology to deliver exceptional efficiency at minimum
cost across the entire load range. CHiL Variable Gate Drive
optimizes the MOSFET gate drive voltage as a function of
real-time load current. CHiL Dynamic Phase Control adds
and drops phases based upon load current. The
CHL8225/8 can be configured to enter 1-phase operation
and active diode emulation mode based upon load current
or by command.
CHiL’s unique Adaptive Transient Algorithm (ATA), based
on proprietary non-linear digital PWM algorithms, minimizes
output bulk capacitors. In addition, a coupled inductor
mode, with phases added/dropped in pairs enables further
improvement in transient response and form factor.
The I2C/PMBus interface can communicate with up to 16
CHL8225/8 based VR loops. Device configuration and fault
parameters are easily defined using the CHiL Intuitive
Power Designer (IPD) GUI and stored in on-chip NVM.
The CHL8225/8 provides extensive OVP, UVP, OCP and
OTP fault protection and includes thermistor based
temperature sensing with VRHOT signal.
The CHL8225/8 includes numerous features like register
diagnostics for fast design cycles and platform
differentiation, simplifying VRD design and enabling fastest
time-to-market with its “set-and-forget” methodology.
SMB_DIO
PWM5
VRHOT_ICRIT#
VRTN
RCSM
ISEN5
ISEN4
ISEN3
VSEN
SMB_CLK
PWM4
VR_READY
IRTN3
IRTN4
IRTN5
RCSP
TSEN
VIDSEL0
PWM3
ENABLE
V18A
RRES
VCC
ISEN2
ISEN1
IRTN1
IRTN2
PWM2
PWM1
RCSM_L2
RCSP_L2
VAR_GATE
VIDSEL1
VIDSEL_L2
VINSEN_AUX1
VR_READY_L2
VCC
VINSEN
VRTN_L2
VSEN_L2
1
2
7
8
5
6
3
4
10
9
30
29
24
23
26
25
28
27
21
22
41 GND
CHL8225
40 Pin 6x6 QFN
Top View
12 1614 1913 1715 201811
39 3537 3238 3436 313340
Figure 1: CHL8225 & CHL8228 Packages
APPLICATIONS
Multiphase GPU systems
CHL8225/CHL8228
DIGITAL MULTI-PHASE BUCK CONTROLLER
PB0008
- 2 -
Rev 1.0, June 11, 2010
TYPICAL APPLICATIONS BLOCK DIAGRAM
+3.3V
V_GPU_L1
CHL8225/8
VINSEN
PWM4
PWM81
PWM3
PWM 2
PWM1
ISEN81
VR_RDY_L1
VSEN
VCC
RRES
V18A
VRTN
IRTN3
ISEN4
IRTN1
RCSP
IRTN2
RCSM
ISEN3
ISEN2
ISEN1
IRTN4
+12V Main
From
System
L
O
A
D
RCS CCS
Rseries
Rseries
RTh
RVIN_1
RVIN_2
IRTN81
VR_RDY_L2
TSEN
RTh2
GND
HVCC
LoGate
HiGate
Vcc
GND
PWM
LVCC
12V
V
Boot
Switch
V
V_VGD
CHL8510
HVCC
LoGate
HiGate
Vcc
GND
PWM
LVCC
12V
V
Boot
Switch
CHL8510
V_VGD
VAR_GATE
Optional Variable
Gate Drive Circuit
V_GPU_L2
L
O
A
D
VR_HOT_ICRIT#
SMB_CLK
SMB_DIO
I2C or
SMBus
V
V
VINSEN_AUX_21
RCSP_L2
RCSM_L2
RCS CCS
Rseries
Rseries
RTh
VSEN_L2
VRTN_L2
VIDSEL0
VIDSEL1
V
V
VINSEN_AUX_1
GPU I/O
+12V Aux 1
RVIN_1
RVIN_2
+12V Aux 2
RVIN_1
RVIN_2 PWM5
ISEN5
IRTN5
PWM61
ISEN61
IRTN61
PWM71
ISEN71
IRTN71
VIDSEL0_L21
V
EN_L21
V
EN
V
Notes
1 CHL8228 only
VMAX1
VBOOT1
Mode
HVCC
LoGate
HiGate
Vcc
GND
PWM
LVCC
12V
V
Boot
Switch
V
V_VGD
CHL8510
Mode
HVCC
LoGate
HiGate
Vcc
GND
PWM
LVCC
12V
V
Boot
Switch
V
V_VGD
CHL8510
Mode
HVCC
LoGate
HiGate
Vcc
GND
PWM
LVCC
12V
V
Boot
Switch
V
V_VGD
CHL8510
Mode
HVCC
LoGate
HiGate
Vcc
GND
PWM
LVCC
12V
V
Boot
Switch
V
V_VGD
CHL8510
Mode
Mode
Unused
phases
VR_HOT2
VIDSEL1_L21
V
TSEN2
RTh2
ORDERING INFORMATION
CHL822 -
Package
Tape & Reel Qty
Part Number
QFN
3000
CHL8225-00CRT1
QFN
3000
CHL8225-xxCRT2
QFN
3000
CHL8228-00CRT1
QFN
3000
CHL8228-xxCRT2
Notes
1 For unprogrammed/default parts, use configuration file
00. Unprogrammed parts will not start up until
programmed in order to insure a safe power up.
2 -xx indicates a customer specific configuration file.
T: Tape & Reel
xx: Configuration file
Operating Temperature
C: Commercial
Standard
Range
R : QFN
Package type
R : QFN
Part
5: CHL8225
8: CHL8228
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
International Rectifier:
CHL8225-00CRT CHL8228G-00CRT