EL SEGUNDO, Calif. — International Rectifier, IR® (NYSE: 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 POL 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.

Specifications

Part Number	IOUT (A)	Switching Frequency (kHz)	Package (mm)	Circuit Type	VIN Range (V)	VOUT Range (V)
IR3891MTRPbF	4A / Ch	300 - 1,500	PQFN 5x6	Dual Output	1 - 21	0.5 - 86%Vin
IR3892MTRPBF	6A / Ch	300 - 1,000

Reference Design	Featured Part	IOUT (A)	VIN Range (V)	VOUT Range (V)	Switching Frequency (kHz)
IRDC3891	IR3891M	4A / 4A	12	1.8 / 1.2	600
IRDC3892	IR3892M	6A / 6A

Design Tools

Datasheets and application notes are posted on the International Rectifier website. 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 http://mypower.irf.com/SupIRBuck.

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.