ISL6568 Datasheet, PDF (1/28 Pages) Intersil Corporation – Two-Phase Buck PWM Controller with Integrated MOSFET Drivers for VRM9, VRM10, and AMD Hammer Applications

®
Data Sheet
July 25, 2005
ISL6568
FN9187.3
Two-Phase Buck PWM Controller with
Integrated MOSFET Drivers for VRM9,
VRM10, and AMD Hammer Applications
The ISL6568 two-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 ISL6568 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 ISL6568
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
TEMP.
PART NUMBER* (°C)
PACKAGE
PKG.
DWG. #
ISL6568CR
0 to 70 32 Ld 5x5 QFN
L32.5x5
ISL6568CRZ (Note) 0 to 70 32 Ld 5x5 QFN (Pb-free) L32.5x5
ISL6568CRZA
(Note)
0 to 70 32 Ld 5x5 QFN (Pb-free L32.5x5
with Anneal)
ISL6568IR
-40 to 85 32 Ld 5x5 QFN
L32.5x5
ISL6568IRZ (Note) -40 to 85 32 Ld 5x5 QFN (Pb-free) L32.5x5
ISL6568IRZA (Note) -40 to 85 32 Ld 5x5 QFN (Pb-free L32.5x5
with Anneal)
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.
Features
• Integrated Multi-Phase Power Conversion
- 1 or 2-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-on-the-fly 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
ISL6568 (QFN)
TOP VIEW
32 31 30 29 28 27 26 25
VID12.5 1
24 BOOT1
REF 2
23 PHASE1
OFS 3
22 VID4
VCC 4
COMP 5
33
GND
21 VID3
20 ENLL
FB 6
19 PHASE2
VDIFF 7
18 BOOT2
RGND 8
17 UGATE2
9 10 11 12 13 14 15 16
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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