The ISL6333 three-phase PWM family of control ICs providea precision voltage regulation system for advancedmicroprocessors. The integration of power MOSFET driversinto the controller IC marks a departure from the separatePWM controller and driver configuration of previous multiphaseproduct families. By reducing the number of externalparts, this integration is optimized for a cost and spacesaving power management solution.The ISL6333 controllers are designed to be compatible withIntel VR11.1 Applications. Features that make these controllerscompatible include an IMON pin for output current monitoring,and a Power State Indicator (PSI#) pin for phase dropping andhigher efficiency during light load states. An 8-bit VID input isused to select the desired output voltage from the VR11 DACtable. A circuit is provided for remote voltage sensing,compensating for any potential difference between remote andlocal grounds. The output voltage can also be positively ornegatively offset through the use of a single external resistor.
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