New XPhase® Chipset Offers High Efficiency Solution for Next Generation AMD Processors

The IR3521 XPhase Control IC supports high speed (HS) I2C serial communications to provide overall system control, interfacing with any number of phase ICs, each driving and monitoring a single phase.  When used with the IR3529 XPhase Phase IC, the IR3521 enables phase dropping to significantly improve the light load performance of the power supply.

Features

• IR3521 Features

• 2 converter outputs for the AMD processor VDD core and VDDNB auxiliary planes

• PSI_L serial commands are communicated to a programmable number of phase ICs

• 0.5% overall system set point accuracy

• High speed error amplifiers with wide bandwidth of 20MHz and fast slew rate of 10V/us

• IR3529 Features

• Reduced dead time

• 7V gate drivers (6A GATEL sink current, 4A GATEH sink current)

• Turbo Mode load turn-on response enhancement

• Programmable cycle-by-cycle over current limit protection

Advantages

• Combined with IR’s DirectFET® MOSFETs the new XPhase chipset for AMD processors delivers a power supply that is smaller, more flexible, and easier to design while providing superior efficiency over the entire load range compared to conventional approaches.

• The IR3521 Control IC combined with the IR3529 Phase IC provides a full featured and flexible way to implement a complete power solution for the latest generation of high performance AMD processors and ASICs.

• The IR3521 Phase IC incorporates unique features that greatly enhance the transient response of the converter thereby reducing the overall size and cost of the solution. In addition the IR3529 also features enhanced drive capability and reduced non-overlap time.

• The IR3521 Control IC provides outputs for both the VDD core and VDDNB auxiliary planes required by the AMD CPU.

• The IR3529 Phase IC features anti-bias circuitry, 7V/4A gate drivers (6A GATE L sink current) and supports loss-less inverter current sensing and converter output voltage up to 5.2V.

Support Material