Dual-phase power IC

14 October 2009 Power Electronics / Power Management

International Rectifier recently introduced the IR3527 XPhase dual-phase IC with independent power savings function for energy-efficient multiphase server applications.

The device drives and monitors two phases of a multiphase synchronous buck converter and implements an independent power savings function (PSI) for each power stage and sequential phase timing for use in single-output multiphase converters. When the power saving mode is enabled, the power stage disables its output, eliminating switching losses while the correct converter operation is maintained by the single power stage or in conjunction with other converter power stages. The IR3527’s current sense amplifiers remain active when in power savings mode to support adaptive voltage positioning.

The new Gen3 XPhase device features converter output voltage up to 5,1 V, lossless inductor current sensing, feed-forward voltage mode control and integrated bootstrap synchronous PFET. In addition, the IR3527 provides self-calibration of PWM ramp, current share amplifier and single-wire bidirectional average current sharing, as well as a debugging function to isolate the phase from the converter. It is available in a small 24L 4 x 4 mm MLPQ package and is RoHS compliant.

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