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Two-Phase Buck PWM Controller with Integrated
MOSFET Drivers for VRM9, VRM10, and AMD Hammer
Applications
ISL6568
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.
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 (RoHS Compliant)
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
|Copyright Intersil Americas Inc. 2004-2006, 2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
January 12, 2012
FN9187.5
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