Digital Multi-Phase Buck Controller
CHL8225G/8G
FEATURES
DESCRIPTION
5-phase & 8-phase dual output PWM Controller
The CHL8225G/8G are dual-loop, digital multi-phase buck
controllers. The CHL8225G drives up to 5 phases and the
CHL8228G 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.
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
The CHL8225G/8G includes the IR Efficiency Shaping
Technology to deliver exceptional efficiency at minimum
cost across the entire load range. IR Variable Gate Drive
optimizes the MOSFET gate drive voltage as a function of
real-time load current. IR Dynamic Phase Control adds and
drops phases based upon load current. The CHL8225G/8G
can be configured to enter 1-phase operation and active
diode emulation based upon load current or by command.
IR 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
IR Adaptive Transient Algorithm (ATA) minimizes
output bulk capacitors and system cost
Per-Loop Fault Protection: OVP, UVP, OCP, OTP
IR’s unique Adaptive Transient Algorithm (ATA), based on
proprietary non-linear digital PWM algorithms, minimizes
output bulk capacitors.
I2C/SMBus/PMBus system interface for telemetry of
Temperature, Voltage, Current & Power for both
loops
The I2C/PMBus interface can communicate with up to 16
CHL8225G/8G-based VR loops. Device configuration and
fault parameters are defined using the IR Digital Power
Design Center (DPDC) GUI and stored in on-chip NVM.
Non-Volatile Memory (NVM) for custom
configuration
Compatible with IR ATL and 3.3V tri-state Drivers
+3.3V supply voltage; 0ºC to 85ºC ambient
operation
The CHL8225G/8G provides extensive OVP, UVP, OCP and
OTP fault protection and includes thermistor based
temperature sensing with VRHOT signal. The CHL8225G/8G
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.
Pb-Free, RoHS, 6x6 40-pin & 8x8 56-pin QFN, MSL2
package
APPLICATIONS
Multiphase GPU systems
PIN DIAGRAM
56
55
54
53
52
51
50
49
48
47
46
45
44
43
1
2
42
41
40
39
38
37
ISEN7
ISEN8
RCSP
RCSP_L2
RCSM_L2
VCC
40
39
38
37
36
35
34
33
32
31
3
RCSM
1
2
30
29
28
27
26
25
24
23
22
21
RCSP_L2
RCSM_L2
VCC
RCSP
RCSM
4
VCC
5
VRHOT2
VSEN
VSEN_L2
VRTN_L2
3
VCC
6
4
VSEN_L2
VRTN_L2
PWM5
VSEN
CHL8228G
7
36 PWM8
VRTN
56 Pin 8x8 QFN
Top View
CHL8225G
5
8
35
VRTN
RRES
PWM7
40 Pin 6x6 QFN
Top View
9
34
33
32
31
30
29
TSEN
PWM6
PWM5
PWM4
PWM3
PWM2
PWM1
6
RRES
10
11
V18A
7
PWM4
TSEN
VR_READY_L1
8
PWM3
V18A
VR_READY_L2 12
PWM2
9
VR_READY_L1
VR_READY_L2
41 GND
13
14
EN_L2
PWM1
57 GND
10
VINSEN
11
12
13
14
15
16
17
18
19
20
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Figure 1: CHL8225G Package Top View
Figure 2: CHL8228G Package Top View
1
June 21, 2013 | FINAL | V1.12