Multiphase Vcore power management with PMBus interface

August 13, 2014 // By Graham Prophet
Texas Instruments has a complete multiphase core voltage (Vcore) power management system for enterprise servers, storage and high-end desktop applications. Compliant with Intel's VR12.5 and VR12 voltage regulation specifications, the DC/DC controllers and NexFET smart power stage deliver highest efficiency in smallest footprint.

TPS53661, TPS53641 and TPS53631 DC/DC controllers and CSD95372B and CSD95373B NexFET smart power stages are a state-of-the-art, digital multiphase solution to power the latest Intel Xeon processors. The complete solution features efficiency at up to 95% in the smallest footprint.

The three DC/DC controllers support 6-, 4- and 3-phase operation respectively, and incorporate TI's advanced D-CAP+ control architecture and a PMBus command set. The CSD95372B and CSD95373B synchronous buck NexFET smart power stage integrate an intelligent driver and power MOSFETs in a compact 5 x 6-mm package. Together, the products provide a complete multiphase Vcore system solution with superior transient performance, highest telemetry accuracy and system reliability.

TI says its D-CAP+ architecture offers ultra-fast transient response, with a design that eliminates beat frequency; dynamic current sharing and cycle-by-cycle current limit ensure robust multiphase regulator operation. The hybrid analogue and digital topology delivers low quiescent power consumption, fast dynamic performance and flexibility.

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