Alpha and Omega Releases SRFET™ Series of MOSFETs With Monolithically Integrated Schottky Diode

Alpha and Omega Semiconductor, Inc. (AOS) announced that it has released a new family of power MOSFETs that feature an integrated Schottky diode. The SRFET™ family of MOSFETs is targeted for applications such as notebook and desktop PCs, servers, graphics cards, gaming consoles, and for general purpose point-of-load dc-dc converter applications.

AOS developed the Soft Recovery MOSFET, or SRFET™, to help designers improve the efficiency and switching performance of their dc-dc converters. Standard MOSFETs include a poor performing parasitic diode that typically has a high forward voltage drop of 0.7V. The SRFET™ features a monolithically integrated Schottky diode, with a forward voltage of only 0.4V, thereby reducing the diode's conduction loss by over 40%, and improving overall system efficiency. Another benefit of the SRFET™ is that its internal Schottky diode reduces the diode reverse-recovery current that is experienced with standard MOSFETs. Monolithic integration overcomes the problem that co-packaged Schottky diodes have with wiring inductance that renders them ineffective at high switching speeds. The result is up to 30% less ringing as well as less power loss due to synchronous MOSFET shoot-through.

On-resistance performance is not sacrificed, as demonstrated with the AOL1412, which features a low 3.9mOhm maximum RDS(ON) rating. The SRFET™ combination of excellent switching performance and low RDS(ON) allows designers to increase the efficiency and switching frequency of their dc-dc converter circuits.

The AOL1412, AO4458, and AO4932 are now available in bottom-exposed UltraSO-8™, single SO-8, and dual SO-8, respectively. Samples are available from stock with production quantities available in 8 weeks. Pricing starts at $0.96, $0.87, and $0.92 for 1,000 units, respectively.