ISL6322G Datasheet, PDF (1/39 Pages) Intersil Corporation – Two-Phase Buck PWM Controller with Integrated MOSFET Drivers, I2C Interface and Phase Dropping

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Data Sheet
May 22, 2008
ISL6322G
FN6715.0
Two-Phase Buck PWM Controller with
Integrated MOSFET Drivers, I²C Interface,
and Phase Dropping
The ISL6322G two-phase PWM control IC provides a
precision voltage regulation system for advanced
microprocessors and memory. The integration of power
MOSFET drivers into the controller IC marks a departure
from the separate PWM controller and driver configuration of
previous multiphase product families. By reducing the
number of external parts, this integration is optimized for a
cost and space saving power management solution.
One outstanding feature of this controller IC is its
multi-processor compatibility, allowing it to work with both Intel
and AMD microprocessors. Included are programmable VID
codes for Intel VR10, VR11, as well as AMD DAC tables. 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.
The ISL6322G includes an I²C interface, allowing the
controller to communicate with other devices over an I²C
bus. Signals sent over this bus can command the ISL6322G
to adjust the number of active phases, voltage margining
offset, phase switching frequency, overvoltage protection
levels, and can select the integrated driver adaptive dead
time scheme.
The ISL6322G also includes advanced control loop features
for optimal transient response to load apply and removal.
One of these features is highly accurate, fully differential,
continuous DCR current sensing for channel-current
balance. Active Pulse Positioning (APP) modulation is
another unique feature, allowing for quicker initial response
to high di/dt load transients.
This controller also allows the user the flexibility to choose
between PHASE detect or LGATE detect adaptive dead time
schemes. This ability allows the ISL6322G to be used in a
multitude of applications where either scheme is required.
Protection features of this controller IC include a set of
sophisticated overvoltage, undervoltage, and overcurrent
protection. Furthermore, the ISL6322G 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 Multiphase Power Conversion
- 2-Phase or 1-Phase Operation with Internal Drivers
• Phase Dropping for Higher Efficiency at Low Output
Current Loads
• Precision Core Voltage Regulation
- Differential Remote Voltage Sensing
- ±0.5% System Accuracy Over-Temperature
- Adjustable Reference-Voltage Offset
• Optimal Transient Response
- Active Pulse Positioning (APP) Modulation
- Adaptive Phase Alignment (APA)
• Fully Differential, Continuous DCR Current Sensing
- Precision Channel-Current Balancing
• I²C Interface
- Phase Dropping
- Voltage Margining Offset
- Switching Frequency Adjustment
- Overvoltage Protection Level Adjustment
- Selects Adaptive Dead Time Scheme
• User Selectable I²C “Slave Only” Device Address:
1000_110x or 1000_111x
• User Selectable Adaptive Dead Time Scheme
- PHASE Detect or LGATE Detect for Application
Flexibility
• Variable Gate Drive Bias: 5V to 12V
• Multi-Processor Compatible
- Intel VR10 and VR11 Modes of Operation
- AMD Mode of Operation
• Microprocessor Voltage Identification Inputs
- 8-bit DAC
- Selectable between Intel’s Extended VR10, VR11, AMD
5-bit, and AMD 6-bit DAC Tables
- Dynamic VID Technology
• Maximum Allowable Output Voltage of 1.6V
• Overcurrent Protection
• Multi-Tiered Overvoltage Protection
• Digital Soft-Start
• Selectable Operation Frequency up to 1.5MHz Per Phase
• Pb-Free (RoHS Compliant)
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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