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October 14, 2009

International Rectifier launches Xphase chipset for DDR3 memory applications

Combines analog control precision with programmability of power management functions

By CBR Staff Writer

International Rectifier, IR has launched IR3522 and IR3506 XPhase chipset that provides power technology for DDR3 multiphase memory applications.

According to International Rectifier, the IR3522 dual output PWM controller with built-in I2C interface provides overall system control for both the DDR3 VDDQ and Vtt rails. The device interfaces with IR3506 phase ICs to drive as many phases as needed to power any number of DDR3 dual in-line memory modules (DIMMS), simplifying layout, reducing board space, and overall system cost. The IR3522/IR3506 chipset enables tracking with the flexibility of margining between the VDDQ and Vtt outputs through the I2C interface.

The company said that the IR3522 allows output voltage programming capability for both VDDQ and Vtt outputs through the I2C compatible interface with a VDDQ set point error of only +/-0.5 %. It provides both source and sink capability to enable tracking of the Vtt output to VDDQ. It programs the Vtt tracking ratio ± 25 % and provides digital on/off control and also offers a set of protection features including over-current, over-voltage, open remote sense, and open control.

The IR3506 phase IC features 7V/2A gate drivers and supports loss-less inductor current sensing. It also features a soft-stop turn-off to ensure VDDR and Vtt tracking and offers over-current protection during PSI assertion mode operation, integrated bootstrap synchronous PFET, debugging function, self-calibration of PWM ramp, current sense amplifier, and current share amplifier and single-wire bidirectional average current sharing, the company said.

Omar Hassen, executive director of multiphase products, enterprise power business unit at IR, said: “The new Xphase solution for DDR3 applications delivers a power supply that is smaller, more flexible and easier to design while providing higher efficiency from light load to full load when compared to conventional approaches. The IR3522 combines the best of both worlds: precision of analog control combined with programmability of power management functions via I2C to implement a simple but smart memory power supply.”

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