Date: 26/05/2010

IR's power management chipset for AMD processors

International Rectifier has unveiled a new chipset the IR3521 and IR3529 to enable power efficiency over the entire load range for AMD made processors.

IR says 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.

"Combined with our DirectFET MOSFETs, our 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," said Deepak Savadatti, senior director, IR's Multiphase Products, Enterprise Power Business Unit.

The IR3521 control IC provides outputs for both the VDD core and VDDNB auxiliary planes required by the AMD CPU and features high speed error amplifiers with wide bandwidth of 20MHz and fast slew rate of 10V/us. Remote sense amplifiers provide differential sensing and require less than 50uA bias current. IR3521 offers programmability features which includes programmable Dynamic VID slew rates, VID Offset (VDD output only), output impedance (VDD output only) and dynamic OC for IDD spike.

The IR3529 phase IC features Power State Indicator (PSI), anti-bias circuitry, 7V/4A gate drivers (6A GATE L sink current) and supports loss-less inductor current sensing and a converter output voltage up to 5.1 V. The new device also implements cycle-by-cycle over-current protection to resolve high repetition load transients.


Price: US $1.90 each in 10,000-unit quantities
Availability: Now

For details visit www.irf.com