The PX3664 is a Digital Multiphase Controller designedto provide core power for today’s high current processorsand memory by driving up to four synchronous-rectifiedbuck-converter channels in parallel. Interleaved timing ofthe channels results in a higher ripple frequency,reducing input and output ripple. With up to four phases,each capable of up to 2 MHz operation, the PX3664 canbe used to build DC-DC converters that provide greaterthan 120A of output current with excellent efficiency andlow ripple.The PX3664 utilizes digital technology to implement allcontrol functions, providing the ultimate in flexibility andstability. The PX3664 incorporates an industry standardI2C-bus serial interface for control and monitoring.Through the serial interface, the power supply designercan quickly optimize designs and monitor systemperformance. The interface allows the PX3664 to providedigitized information for real time system monitoring andcontrol.The PX3664 supports dynamic phasing capability whichallows the system to shed one or more phases based onaverage current. Autonomous phase control circuitry willdrop phases when average current goes below specifiedthreshold and add phases when average current is abovethe threshold. An I2C based user phase control mode isalso provided.
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