CHL8225_15 Datasheet, PDF (1/2 Pages) International Rectifier – DIGITAL MULTI-PHASE BUCK CONTROLLER

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
 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
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.
40 39 38 37 36 35 34 33 32 31
RCSP 1
RCSM 2
VCC 3
VSEN 4
VRTN 5
RRES 6
TSEN 7
V18A 8
VR_READY 9
VR_READY_L2 10
CHL8225
40 Pin 6x6 QFN
Top View
41 GND
30 RCSP_L2
29 RCSM_L2
28 VCC
27 VSEN_L2
26 VRTN_L2
25 PWM5
24 PWM4
23 PWM3
22 PWM2
21 PWM1
11 12 13 14 15 16 17 18 19 20
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
56 55 54 53 52 51 50 49 48 47 46 45 44 43
ISEN8 1
RCSP 2
RCSM 3
VCC 4
VRHOT2 5
VSEN 6
VRTN 7
RRES 8
TSEN 9
V18A 10
VR_READY 11
VR_READY_L2 12
EN_L2 13
VINSEN 14
CHL8228
56 Pin 8x8 QFN
Top View
57 GND
42 ISEN7
41 RCSP_L2
40 RCSM_L2
39 VCC
38 VSEN_L2
37 VRTN_L2
36 PWM8
35 PWM7
34 PWM6
33 PWM5
32 PWM4
31 PWM3
30 PWM2
29 PWM1
15 16 17 18 19 20 21 22 23 24 25 26 27 28
Figure 1: CHL8225 & CHL8228 Packages
APPLICATIONS
 Multiphase GPU systems
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: [phone]
www.chilsemi.com
© 2010 CHiL Semiconductor Corp. All rights reserved