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IR rolls out control IC for AMD processor-powered servers

Posted: 03 Mar 2005 ?? ?Print Version ?Bookmark and Share

Keywords:international rectifier? ir? ir3082? multiphase control ic? multiphase control ic?

International Rectifier (IR) unveiled the IR3082 multiphase control IC for amd opteron and athlon 64 processor-powered servers and workstations. Together with DirectFET power MOSFETs, the IR3082 delivers an optimized multiphase dc-dc power solution for mid-range and high-end servers, voltage regulator modules (VRMs) and high current telecom applications, said the press release.

"The IR3082 fills the need for a high efficiency, flexible multiphase solution for AMD-processors," commented Stephen Tsang, SVP of sales at IR. "Customers can migrate existing XPhase designs to fit AMD applications with minimal design effort."

The IR3082 works with the IR3086A phase IC to provide a full-featured and flexible way to implement a complete Opteron or Athlon 64 power solution. For example, IR said, a 12V, four-phase design using one IRF6617 control FET and one IRF6691 synchronous FET per phase provides a 86 percent efficiency for an output of 80A.

Features of the IR3082 include a 5bit VID with 1 percent overall system accuracy; an adaptive voltage-positioning feature that maintains the output voltage tolerance while minimizing output capacitor requirements; a patented body braking circuit that can reduce the output capacitance requirement by 25 percent; and a 150kHz to 1MHz programmable oscillator that gives designers additional flexibility to optimize for system efficiency and transient response.

For system protection and reliability, the IR3082 features programmable soft-start and hiccup over-current protection. Current sensing is achieved with loss-less inductor current sensing which improves accuracy compared to sensing circuits measuring MOSFET on-resistance. The included under-voltage lockout and over-voltage protection circuits ensure reliability of system voltages, and the power-good output signal indicates proper operation.

The IR3082 broadens the company's XPhase family of scalable multiphase ICs. XPhase is IR's distributed multiphase architecture which 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. The five-wire analog bus consists of bias voltage, phase timing, average current, error amplifier output and VID voltage. By eliminating point-to-point wiring between the control and the phase ICs, the five-wire bus shortens interconnections and reduces parasitic inductance and noise, said IR.

The IR3082 XPhase control IC is housed in a thermally-enhanced 5-by-5mm, 20L MLPQ package. Pricing is $1.49 each in 10,000-piece quantities, with prices subject to change without prior notice.

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