International Rectifier (IR) has launched the IR3522 and the IR3506 XPhase chipsets that provide a complete power solution for DDR3 multiphase memory applications. 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 any number of 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 accurate tracking with the additional flexibility of margining between the VDDQ and Vtt outputs through the I2C interface.
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 percent. The IR3506 provides both source and sink capability to enable more accurate tracking of the Vtt output to VDDQ. In addition the IR3506 supports a power savings function (PSI) to maximize efficiency at light loads.
The IR3522’s I2C interface programs the Vtt tracking ratio ±25 percent and provides digital ON/OFF control. Four I2C addresses are selectable using two ADDR pins while four different VREF1 voltages are selectable using two VID pins if I2C communication is not available. Soft-stop turn-off to ensure VDDR and Vtt tracking is also featured in addition to a fault activated Crowbar pin to drive external NMOS devices for external output voltage protection. As with all Xphase ICs, the IR3522 features a comprehensive set of protection features including over-current, over-voltage, open remote sense, and open control.
The IR3506 phase IC features 7V/2A gate drivers (4A GATEL sink current) and supports loss-less inductor current sensing. The device also features a soft-stop turn-off to ensure VDDR and Vtt tracking. The IR3506 also 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.
International Rectifier
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