Overview: ®
Data Sheet February 15, 2007 ISL6322
FN6328.1 Four-Phase Buck PWM Controller with Integrated MOSFET Drivers and I2C Interface for Intel VR10, VR11, and AMD Applications
The ISL6322 four-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 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 patibility, 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, pensating 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 ISL6322 includes an I2C interface, allowing the controller to municate with other devices over an I2C bus. Signals sent over this bus can mand the ISL6322 to adjust voltage margining offset, converter switching frequency, and overvoltage protection levels, and can select the integrated driver adaptive dead time scheme.
