IR Introduces IR3891 and IR3892 Dual Output SupIRBuck® Voltage Regulators for Space-Constrained Netcom, Server and Storage Applications

Business Wire


International Rectifier, IR® (IRF), a world leader in power management technology, today introduced the IR3891 and IR3892 SupIRBuck® integrated dual output voltage regulators designed for space-constrained netcom, server and storage applications.

The new dual output devices are optimized for single rail operation from 5V to 12V inputs or 1V to 21V input with external 5V bias. Available in a compact 5x6mm PQFN package, the IR3891 and IR3892 offer an ultra-compact solution for applications requiring up to 4A per channel and up to 6A per channel respectively in as little as 165 mm2.

“The IR3892 single-sided PCB designs are 46% smaller when compared with traditional designs that utilize two 6A single output converters. The IR3892 also works comfortably with dual-sided designs, further reducing PCB board size to less than 30% of the space required in traditional designs,” said John Lambert, IR’s Point-of-Load Marketing Manager.

The IR3891 and IR3892 feature a proprietary modulator scheme that enables jitter-free and noise-free operation to allow higher frequency/higher bandwidth operation for better transient response and fewer output capacitors to reduce overall system size. Other key features include interleaved phases to reduce input capacitance, powertrain isolation to eliminate crosstalk and sequencing capability on channel two.

“Offering the features and benefits of the SupIRBuck® family, these new dual output devices offer an efficient ultra-compact solution to meet the demands of space constrained, lower power netcom, server and storage applications,” added John Lambert.

The IR3891 and IR3892 offer SupIRBuck standard features that include switching frequency up to 1.5MHz and 1.0Mhz respectively, pre-biased start-up, input voltage aware enable, over voltage protection, power good, optional true output voltage sensing for open line feedback and adjustable OVP, internal soft-start and minimum input voltage of 1.0V (with ext. bias) and operating junction temperatures of -40oC to 125oC. This new device and the entire SupIRBuck family are industrial qualified ensuring robust designs for durable systems.

More information is available on the International Rectifier website at

Design Tools

Datasheets and application notes are posted on the International Rectifier website at The IRDC3891 and IRDC3892 SupIRBuck reference designs featuring the new devices are also offered. A SupIRBuck Excel spreadsheet design tool and Icepak thermal model are available to facilitate design in addition to a user friendly, interactive, web-based selection and simulation tool at

Price and Availability

Pricing for the IR3891 and IR3892 begins at US $3.46 and US $3.56 each respectively in 100,000-unit quantities. Pricing for the IRDC3891 and IRDC3892 SupIRBuck reference designs start at US $29 per kit. Production orders are available immediately. Prices are subject to change.

About International Rectifier

International Rectifier (IRF) is a world leader in power management technology. IR’s analog and mixed signal ICs, advanced circuit devices, integrated power systems and components enable high performance computing and reduce energy waste from motors, the world’s single largest consumer of electricity. Leading manufacturers of computers, energy efficient appliances, lighting, automobiles, satellites, aircraft and defense systems rely on IR’s power management benchmarks to power their next generation products. For more information, go to

Trademark Notice

IR® and SupIRBuck® are registered trademarks of International Rectifier Corporation. All other product names noted herein may be trademarks of their respective holders.

International Rectifier
Sian Cummins, 1-310-252-7148


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