EL SEGUNDO, CA. August 1999 - International Rectifier (IR^®), the power experts, are expanding their FETKY^™; product offering with two new N-channel Synchronous FETKYs. Designated the IRF7807D1 and IRF7807D2, these new low-voltage 30V FETKYs enable circuit designers to reduce the required footprint of the synchronous MOSFET solution, increasing power density while providing the same efficiency and performance of an equivalent discrete solution.

The FETKY, which co-packages an advanced HEXFET^® power MOSFET together with an ultra low Vf Schottky diode, was pioneered by IR. For the synchronous FET socket within DC-DC converters, a Schottky is paralleled with a MOSFET to provide a more efficient path for deadtime conduction compared with the body diode of the MOSFET alone. When the Schottky is integrated into the same package as the MOSFET, much lower stray inductances are achieved, keeping the voltage developed across the Schottky during conduction to a minimum to increase efficiency.

"The new Synchronous FETKYs are optimized for low power 3.3Vout and 5.0Vout DC-DC converters, like those within the notebook PC and other portable systems equipment. By including the Schottky diode in the same package as the MOSFET, the solution achieves the smallest possible component footprint for DC-DC conversion up to 5Aout. These FETKYs are also suited for other similar low-power synchronous buck DC-DC converter applications.

"With ever-increasing demands being placed upon portable systems like laptops, reducing form factors, saving space, and improving electrical and thermal efficiency are becoming very important system design considerations," said Carl Smith, product marketing engineer for the Processor Power Group at IR. "Our new Synchronous FETKY was designed for application specific low voltage DC-DC applications, and to expand IR's focus on DC-DC conversion solutions. This solution provides a lower component count, a reduced footprint on the circuit board and achieves efficiency parity versus the next best discrete solution." Smith said, "The new Synchronous FETKYs help designers achieve as high an electrical and thermal efficiency as possible. The IRF7807D1 is in an SO-8 package and provides very good RDS(on) of 17mOhms at Vgs = 4.5V for on-state conditions and low Vf = 0.5V at 1A for the Schottky during deadtime conditions. The IRF7807D2, also in an SO-8, offers the same on-state performance as the IRF7807D1, but integrates a 3A-rated Schottky with Vf = 0.57V @ 3A."

The new IR Synchronous FETKYs, optimized for DC-DC converters in the next generation notebook PCs and other battery-operated portable systems, are available in industry standard SO-8 surface mount packages . Samples are available from stock, with production quantities commencing in August 1999.

For other related information visit the FETKY web-site.