Power chipset for AMD CPUs

26 November 2008 Power Electronics / Power Management

International Rectifier has introduced the IR3514 and IR3507 XPhase chipset for AMD parallel and serial VID (PVID and SVID) processors.

The IR3514 control IC enables designers to migrate from AMD processors requiring a parallel VID to SVID processors without the need to change the motherboard. Combined with the IR3507 phase IC, the IR3514 provides power saving interface (PSI) capability to turn phases (N-1) on or off depending on CPU load requirements. The IR3514 is designed to receive power saving commands through the SVI serial bus and communicates this information to the IR3507 to improve efficiency at light loads and MIPS per watt.

The IR3514’s six-wire communication bus simplifies routing and interfaces with any number of phase ICs, each driving and monitoring a single phase. It provides independent control of both the VDD core and VDDNB auxiliary planes required by AMD CPUs when operated in SVI mode.

When operated in PVI mode, the IR3514 controls the VDD core plane through six parallel VID input bits while the VDDNB plane power stage is kept at high impedance. An overall system setpoint accuracy of 0,5% is achieved. Other features include programmable dynamic VID slew rates, programmable VID Offset (VDD output only) and programmable output impedance (VDD output only).

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