Integrated devices for servers achieve 94.5% efficiency

International Rectifier (IR) announces 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 50 A, the IR3551 is optimized for high-end processor and DDR memory multiphase solutions, offering a peak efficiency of 94.5% at 1.2 V 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, 6 x 5-mm footprint compatible PQFN package.

The IR3551 is footprint compatible with the IR3550 and IR3553. Using a single layout, with the choice of several plug and play PowIRstage products, users can now select the best price and performance solution while eliminating the risk of a board redesign due to changing requirements. 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 other controller-based inductor DCR sense methods, according to company sources. 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.

For more information, contact International Rectifier, 233 Kansas St., El Segundo, CA 90245. Phone: (310) 252-7105.