The PX3544 Graphics Processor Digital MultiphaseController provides core power for today’s high currentgraphic processors by driving up to four synchronousrectifiedbuck-converter channels in parallel. Interleavedtiming of the channels results in a higher ripplefrequency, reducing input and output ripple. With up tofour phases, each capable of up to 2 MHz operation, thePX3544 can be used to build DC-DC converters thatprovide up to 130A with excellent efficiency, low ripple,and the lowest component count.The PX3544 utilizes digital technology to implement allcontrol functions, providing the ultimate in flexibility andstability. The PX3544 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 PX3544 to providedigitized information for real time system monitoring andcontrol.The PX3544 provides intelligent phase detection capabilityallowing the system to operate under the condition of up to2 (of 3) missing 12V supplies. Autonomous phase controlcircuitry will drop phases due to current balance or 12Vfaults and add phases when the 12V supply returns. AnI2C based user phase control mode is also provided.
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