IR Extends its PowIRstage™ Portfolio to Enhance Scalability and Performance for Space and Thermally Constrained Computing and Consumer Applications

EL SEGUNDO, Calif. — International Rectifier, IR® (NYSE: IRF), a world leader in power management technology, today announced the extension of its PowIRstage™ family of integrated devices with the introduction of the IR3551, optimized for use in next-generation servers, desktop PCs, graphics cards, and communication systems.

Offering a maximum operating point of 50A, the IR3551 is optimized for high end processor and DDR memory multiphase solutions, offering a peak efficiency of 94.5 percent at 1.2V output. The new device integrates a synchronous buck gate driver, benchmark figure-of-merit control and synchronous MOSFETs and a Schottky diode into a small, high density, low profile 6x5mm footprint compatible PQFN package.

“The IR3550 and IR3553 have been proven to deliver efficiency and space savings in our customers’ designs. With the introduction of the IR3551 we now offer footprint compatible 60A, 50A and 40A rated devices to allow our customers to optimize the efficiency of each phase depending on their application,” said Deepak Savadatti, Vice President and General Manager, IR’s Enterprise Power Business Unit.

The IR3551 is footprint compatible with the IR3550 and IR3553. Using a single layout, with the choice of several plug and play PowIRstage™ products, customers can now select the best price/performance solution while eliminating the risk of a board re-design due to changing requirements.

The IR3551, IR3550 and IR3553 utilize IR’s leading-edge technology in silicon integration, packaging and control techniques to achieve a high current density and high efficiency power stage solution. The PowIRstage™ devices enable system-level scalability in high current, high efficiency multi-phase configurations. The resulting system solution can in most cases be achieved in less phases and board space versus alternate solutions.

IR’s PowIRstage™ products also provide an integrated current sense amplifier that achieves superior current sense accuracy and noise immunity compared to best-in-class controller based inductor DCR sense methods. The IR3551, IR3553 and IR3550 are fully PWM compatible with IR’s CHiL® digital power control products, as well as most industry standard PWM controllers on the market.

IR’s entire family of PowIRstage™ products including next-generation devices with dual-sided cooling for higher power density applications were recently showcased at APEC 2012.


Part Number Package Iout max VIN Efficiency peak% FSW max Vout
IR3551 PQFN 6x5mm 50A 4.5V-15V 94.5 1000kHz 0.25V- (Vin - 2.5V)


Pricing for the IR3551 begins at $2.35 for 10,000-unit quantities. Prices are subject to change.