International Rectifier has 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 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.
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.
Offering SupIRBuck standard features, the IR3891 and IR3892 have 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.