PRODUCT BRIEF
CHL8225/CHL8228
DIGITAL MULTI-PHASE BUCK CONTROLLER
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
I
CRITICAL
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
RCSP
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.
ISEN1
ISEN2
ISEN3
ISEN4
ISEN5
31
30
29
28
27
CHL8225
40 Pin 6x6 QFN
Top View
26
25
24
23
22
41
GND
VR_READY_L2
10
11
12
13
14
15
16
17
18
19
20
21
PWM1
RCSP_L2
RCSM_L2
VCC
VSEN_L2
VRTN_L2
PWM5
PWM4
PWM3
PWM2
IRTN1
IRTN2
IRTN3
IRTN4
40
1
2
3
4
5
6
7
8
9
39
38
37
36
35
34
33
32
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
RCSM
VCC
VSEN
VRTN
RRES
TSEN
V18A
VR_READY
SMB_DIO
VIDSEL0
VINSEN
IRTN5
VINSEN_AUX1
ISEN1
ISEN2
ISEN3
ISEN4
ISEN5
IRTN8
ISEN6
44
IRTN1
IRTN2
IRTN3
IRTN4
IRTN5
IRTN6
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
Trademarks and registered trademarks are the property of the respective
owners.
PB0008, Rev 1.0, June 11, 2010
56
1
2
3
4
5
6
7
8
9
10
11
12
13
55
54
53
52
51
50
49
48
47
46
45
43
42
41
40
39
38
37
ISEN7
RCSP_L2
RCSM_L2
VCC
VSEN_L2
VRTN_L2
PWM8
PWM7
PWM6
PWM5
PWM4
PWM3
PWM2
PWM1
ISEN8
RCSP
RCSM
VCC
VRHOT2
VSEN
VRTN
RRES
TSEN
V18A
VR_READY
VR_READY_L2
EN_L2
VINSEN
IRTN7
36
35
34
33
32
31
30
29
28
DESCRIPTION
CHL8228
56 Pin 8x8 QFN
Top View
VRHOT_ICRIT#
VAR_GATE
ENABLE
VIDSEL_L2
SMB_CLK
VIDSEL1
57
GND
14
15
16
17
18
19
20
21
22
23
24
25
26
27
VRHOT_ICRIT#
SMB_DIO
TSEN2
VINSEN_AUX2
VINSEN_AUX1
VIDSEL0_L2
Figure 1: CHL8225 & CHL8228 Packages
APPLICATIONS
Multiphase GPU systems
One Highwood Drive, Tewksbury, MA 01876
Tel: +1(978) 640-0011
www.chilsemi.com
© 2010 CHiL Semiconductor Corp. All rights reserved
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1
-
VIDSEL1_L2
VAR_GATE
VBOOT
ENABLE
SMB_CLK
VIDSEL1
VIDSEL0
VMAX
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