El Segundo, Calif.—International Rectifier‘s improved XPhase family of scalable multi-phase DC/DC chipset devices, the IR3084 and IR3084U control ICs, help achieve up to three percent higher efficiency in 130-amp applications with seven phases, as compared to five-phase designs.
The new control ICs, designed for use with the company’s existing IR3086A phase IC and companion DirectFET power MOSFETs such as the IRF6617 and IRF6691, increase power density as well as efficiency in desktops, servers, voltage regulator modules (VRM) and embedded systems. The IR3084 supports Intel VR10.x and VR11 microprocessor core power requirements; 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 current in each phase of a seven-phase system, compared to five, is less, enabling the use of smaller inductors and output capacitors. Thus overall footprint is cut from 3200 to 2400 mm2, a 25 percent reduction in board area.
The seven-phase IR3084 solution including the IRF6617 and IRF6691 power MOSFETs achieves 88 percent efficiency at full load current and eliminates the need for a heatsink. "Removal of the regulator heatsink reduces manufacturing costs and improves airflow to the CPU in low-profile 1U and blade servers. This improves system performance and long-term product reliability," said Faisal Ahmad, marketing manager for DC/DC Computing Products.
Both control ICs include 0.5 percent overall system accuracy and differential remote voltage sensing. The ICs offer a programmable oscillator (150 kHz to 1 MHz), remote temperature sensing, and lossless DCR current sensing with programmable hiccup over-current protection. The IR3084U includes a VID select pin, which allows for simple migration from AMD to Intel VID codes.
The IR3084/IR3084U data sheet is restricted to VR11 licensees only. Contact Wayne Yoshida at email@example.com for more information. The IR3084 is priced at $1.60 each, and the IR3084U is $1.75, both in 10k quantities. Prices are subject to change. Both chips are available in tape and reel.
XPhase is IR's distributed multiphase architecture that consists of control ICs and phase ICs that communicate using a simple five-wire bus scheme. Phases can
be added or removed without changing the fundamental design. For more information, click here.
International Rectifier, 1-305-252-7105, www.irf.com