®
ISL6566
Data Sheet
March 9, 2006
FN9178.4
Three-Phase Buck PWM Controller with
Integrated MOSFET Drivers for VRM9,
VRM10, and AMD Hammer Applications
The ISL6566 three-phase PWM control IC provides a
precision voltage regulation system for advanced
microprocessors. The integration of power MOSFET drivers
into the controller IC marks a departure from the separate
PWM controller and driver configuration of previous multi-
phase product families. By reducing the number of external
parts, this integration is optimized for a cost and space
saving power management solution.
Outstanding features of this controller IC include
programmable VID codes compatible with Intel VRM9,
VRM10, as well as AMD Hammer microprocessors. A unity
gain, differential amplifier is provided for remote voltage
sensing, compensating for any potential difference between
remote and local grounds. The output voltage can also be
positively or negatively offset through the use of a single
external resistor.
A unique feature of the ISL6566 is the combined use of both
DCR and r
DS(ON)
current sensing. Load line voltage
positioning (droop) and overcurrent protection are
accomplished through continuous inductor DCR current
sensing, while r
DS(ON)
current sensing is used for accurate
channel-current balance. Using both methods of current
sampling utilizes the best advantages of each technique.
Protection features of this controller IC include a set of
sophisticated overvoltage, undervoltage, and overcurrent
protection. Overvoltage results in the converter turning the
lower MOSFETs ON to clamp the rising output voltage and
protect the microprocessor. The overcurrent protection level
is set through a single external resistor. Furthermore, the
ISL6566 includes protection against an open circuit on the
remote sensing inputs. Combined, these features provide
advanced protection for the microprocessor and power
system.
Features
• Integrated Multi-Phase Power Conversion
- 1, 2, or 3-Phase Operation
• Precision Core Voltage Regulation
- Differential Remote Voltage Sensing
-
±0.5%
System Accuracy Over Temperature
- Adjustable Reference-Voltage Offset
• Precision Channel Current Sharing
- Uses Loss-Less r
DS(ON)
Current Sampling
• Accurate Load Line Programming
- Uses Loss-Less Inductor DCR Current Sampling
• Variable Gate Drive Bias: 5V to 12V
• Microprocessor Voltage Identification Inputs
- Up to a 6-Bit DAC
- Selectable between Intel’s VRM9, VRM10, or AMD
Hammer DAC Codes
- Dynamic VID Technology
• Overcurrent Protection
• Multi-tiered Overvoltage Protection
• Digital Soft-Start
• Selectable Operation Frequency up to 1.5MHz Per Phase
• Pb-Free Plus Anneal Available (RoHS Compliant)
Pinout
ISL6566 (QFN)
TOP VIEW
UGATE1
31
30 BOOT1
29 PHASE1
28 PHASE2
27 UGATE2
41
GND
26 BOOT2
25 ISEN2
24 PVCC2
23 LGATE2
22 PHASE3
21 BOOT3
11
RGND
12
VSEN
13
OCSET
14
ICOMP
15
ISUM
16
IREF
17
LGATE3
18
PVCC3
19
ISEN3
20
UGATE3
LGATE1
PGOOD
PVCC1
33
ISEN1
32
ENLL
37
VID2
VID3
VID4
40
VID1
VID0
VID12.5
VRM10
REF
OFS
VCC
COMP
FB
1
2
3
4
5
6
7
8
9
39
38
FS
36
35
34
VDIFF 10
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2004-2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
Analog electronics
京公网安备 11010802033920号
EEWORLD
