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IR’s Control IC Provides Highly Flexible Intel VR11.0 and VR11.1 Processor-Based Power Solutions

19th March 2008

International Rectifier

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International Rectifier’s IR3502 XPhase control IC provides overall system control and interfaces with any number of IR’s XPhase phase ICs, each driving and monitoring a single phase. The IR3502’s key features include 0.5 percent overall system set point accuracy and daisy-chain digital phase timing for accurate phase interleaving without the need for external components. Combined with the IR3507 phase IC, the IR3502 and IR3507 chipset provides the power state indicator (PSI) capability to improve voltage regulator module (VRM) light load efficiency.

Designed for IR3502 for Intel VR11.0 and VR11.1 processors, the IR3502 is 50 percent smaller than a traditional six-phase control IC in a 7mm by 7mm MLP package. Co-designed with the IR3507 phase IC and DirectFET MOSFETs, the Xphase chipset provides higher power density compared to traditional multiphase architectures and results in a power supply that is smaller, less expensive, and easier to design introduced.

Featuring a host of protection features, the IR3502 has a high level of programmability including programmable 250kHz to 9MHz clock oscillator frequency to provide per phase switching frequency of 250kHz to 1.5MHz, programmable dynamic VID slew rate and programmable VID offset or no offset, in addition to high speed error amplifier with wide bandwidth of 30MHz and fast slew rate of 10V/us. The IR3502 also features improved droop capability that reduces the potential need for an external thermistor.