New Industry Products

IR Adds Optimized Single-Phase 5A and 12A Synchronous Buck Reference Designs

February 21, 2007 by Jeff Shepard

International Rectifier (IR)® introduced two new POWIR+™ chipset reference designs, the IRPP3624-05A and IRPP3624-12A. Simplifying and accelerating circuit design, the new reference designs target single-phase synchronous buck converter applications in computing and high-end consumer applications.

The new POWIR+ chipsets, featuring IR’s IR3624MPBF PWM control IC and companion HEXFET® MOSFETs, are supported by these new reference designs and IR’s enhanced design services available at the company’s website where the standard designs may be modified to create custom circuits, for faster time-to-market.

The IRPP3624-05A, optimized for low-current applications up to 5A, achieves 88.5% efficiency with 12V input and 3.3V output. The IRPP3624-12A, targeting medium-current applications up to 12A, achieves 84% efficiency with 12V input and 1.8V output at maximum load. Both reference designs utilize the IR3624MPBF PWM Control IC that includes features such as pre-bias start-up, programmable over-current protection, and 0.6V precision internal reference voltage.

The IRPP3624-05A uses a dual SO-8 MOSFET, the IRF8910PBF, to reduce size and component count. The IRF7823PBF and IRF7832ZPBF SO-8 MOSFETs utilized in the IRPP3624-12A allow higher current due to improved thermal and electrical efficiency. Each of these fully-tested and characterized POWIR+ reference designs is available with a full suite of online simulation tools. Simulation capabilities include small- and large-signal analysis, switching waveforms, and performance analysis for all components.

The new series of POWIR+ chipset reference designs are available immediately. Customized reference designs are available 1-2 weeks ARO, ordered through the POWIR+ chipset online design tool. Pricing for the standard IRPP3624-05A and IRPP3624-12A is US$150 each per unit. The devices are RoHS compliant.