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IR control IC simplifies non-processor-specific multiphase apps

Posted: 23 Feb 2005 ?? ?Print Version ?Bookmark and Share

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

International Rectifier (IR) introduced the IR3082 multiphase control IC for AMD processor" target=_blank>opteron and Athlon64 processor-powered servers and workstations. Together with DirectFET power MOSFETs, this new chip delivers an optimized multiphase dc-dc power solution for mid-range and high-end servers, voltage regulator modules (VRMs) and high current telecom applications.

Expanding the company's XPhase family of scalable multiphase ICs, the IR3082 works with the IR3086A Phase IC to provide a full-featured and flexible way to implement a complete Opteron or Athlon64 power solution. According to Faisal Ahmad, Marketing Manager for DC-DC Computing Products, the IR3082 fills the need for a high efficiency, flexible multiphase solution for AMD processors. "Customers can migrate existing XPhase designs to fit AMD applications with minimal design effort," Ahmad added.

Features of the new 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, and a patented body braking circuit that can reduce the output capacitance requirement by 25 percent. A 150kHz to 1MHz programmable oscillator gives the designer additional flexibility to optimize for system efficiency and transient response.

Unlike other multiphase solutions which have a fixed number of phases, IR's XPhase architecture enables scalable multiphase designs. The IR3082 uses 5bit voltage programming and only a few external components which simplify general purpose and non-processor-specific multiphase applications.

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. In addition, the under-voltage lockout and over-voltage protection circuits ensure reliability of system voltages, and a power-good output signal indicates proper operation.

Available immediately, the IR3082 XPhase control IC is packaged in a thermally-enhanced 5-by-5mm, 20L MLPQ package and is priced at $1.49 each in 10,000-piece quantities.

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