Power Electronics

Control IC Increases Multiphase Converter Efficiency

International Rectifier (IR) has expanded the XPhase family of scalable multiphase converter chipset devices with the IR3084 and IR3084U XPhase Control ICs. The new control ICs are designed to be used with IR’s existing IR3086A Phase IC and companion DirectFET power MOSFETs such as the IRF6617 and IRF6691 to achieve as much as 3% higher efficiency in 130 A applications with seven phases.
The IR3084 supports Intel VR10.x and VR11 microprocessor core power requirements, while the IR3084U is a universal voltage identification (VID) device for VR10.x and VR11 as well as AMD Opteron VID codes and start-up sequences. The IR3084U includes a VID select pin that allows for simple migration from AMD to Intel VID codes.

The use of seven phases enables the use of smaller inductors and reduced output capacitors. This enables a reduction in footprint size from 3200 mm2 to 2400 mm2.
The seven-phase IR3084 solution including the IRF6617 and IRF6691 power MOSFETs achieves 88% efficiency at full load current and eliminates the need for a heatsink.

Both control ICs include 0.5% overall system accuracy and differential remote voltage sensing. The ICs offer a programmable 150-kHz to 1-MHz oscillator, remote temperature sensing, and lossless DCR current sensing with programmable hiccup overcurrent protection. The IR3084 and IR3084U data sheet is restricted to VR11 licensees only. Please contact IR for more information.

The IR3084 and IR3084U XPhase control ICs are available now. Pricing is $1.60 each for the IR3084MPbF and the IR3084MTRPbF, and $1.75 each for the IR3084UMPbF and the IR3084UMTRPbF. Both prices apply to 10,000-unit quantities.

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