ISL6566 Datasheet, PDF (1/28 Pages) Intersil Corporation – Three-Phase Buck PWM Controller with Integrated MOSFET Drivers for VRM9, VRM10, and AMD Hammer Applications

®
Data Sheet
July 25, 2005
ISL6566
FN9178.3
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.
Ordering Information
PART NUMBER*
TEMP.
(°C)
PACKAGE
PKG.
DWG. #
ISL6566CR
0 to 70 40 Ld 6x6 QFN
L40.6x6
ISL6566CRZ (Note) 0 to 70 40 Ld 6x6 QFN (Pb-free) L40.6x6
ISL6566CRZA (Note) 0 to 70 40 Ld 6x6 QFN (Pb-free) L40.6x6
ISL6566IR
-40 to 85 40 Ld 6x6 QFN
L40.6x6
ISL6566IRZ (Note) -40 to 85 40 Ld 6x6 QFN (Pb-free) L40.6x6
ISL6566IRZA (Note) -40 to 85 40 Ld 6x6 QFN (Pb-free) L40.6x6
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100% matte
tin plate termination finish, which are RoHS compliant and compatible
with both SnPb and Pb-free soldering operations. Intersil Pb-free
products are MSL classified at Pb-free peak reflow temperatures that
meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
*Add “-T” suffix for tape and reel.
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
40 39 38 37 36 35 34 33 32 31
VID1 1
VID0 2
VID12.5 3
VRM10 4
REF 5
OFS 6
VCC 7
COMP 8
FB 9
VDIFF 10
41
GND
30 BOOT1
29 PHASE1
28 PHASE2
27 UGATE2
26 BOOT2
25 ISEN2
24 PVCC2
23 LGATE2
22 PHASE3
21 BOOT3
11 12 13 14 15 16 17 18 19 20
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, 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.