International Rectifier (IR), a global leader in power semiconductors and management solutions, has launched the SupIRBuck family of point-of-load (POL) regulators in a compact 4x5 mm package. These new devices are ideal for energy-efficient servers, storage systems, telecom infrastructure, network equipment, and set-top boxes. They offer the same performance and efficiency as their predecessors but with a 33% smaller footprint, making them perfect for space-constrained applications.
The IR3853, IR3856, and IR3859 SupIRBuck regulators integrate high-performance controllers and IR’s latest MOSFETs into a 4x5 mm ultra-thin PQFN package. They deliver output currents of 4 A, 6 A, and 9 A respectively, with peak efficiencies exceeding 96%. New features include overvoltage protection, external synchronization to reduce noise and EMI in multi-rail systems, and precise output voltage detection options tailored for adjustable PGOOD and OV thresholds.
These regulators eliminate the need for traditional two-stage POL conversion, allowing direct operation from 12 V input. While optimized for 12 V, they also provide excellent efficiency in 5 V monorail applications. With a programmable switching frequency up to 1.5 MHz and a small footprint of 4x5 mm, the new regulators not only reduce board size and cost but also increase power density. Their flexible design supports various layout options, accelerating time-to-market for engineers.
Pan Dawei, Vice President of Sales for IR Asia Pacific, stated, “The IR3853, IR3856, and IR3859 series maintain the same efficiency and functionality as previous SupIRBuck models while reducing the footprint by 33%. This makes them highly suitable for space-sensitive POL applications. Additionally, these new regulators offer more compact and cost-effective solutions under 9 amps.â€
The SupIRBuck family includes features such as programmable interrupt current limiting, soft-start control, enhanced pre-bias startup, temperature protection, voltage-sensing enable pins, power-good outputs for undervoltage and overvoltage detection, and a 0.7 V reference voltage with ±1% accuracy across a -40°C to 125°C operating junction temperature range.
Design Tools
The SupIRBuck regulators are now available for volume orders. Detailed data sheets, application notes, and reference designs for IRDC3853, IRDC3856, and IRCD3859 are available on the IR website. Engineers can request these reference designs to streamline their development process.
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