MOSFETs suit synchronous buck applications.

Press Release Summary:

PowerTrench, 30 V, FDS6294 exhibits Miller Charge (Qgd) value of 3nC (typical) and low RDS(on) of 11.3 mohm max in SO-8 package. Lead-free (Pb-free) PowerTrench, 30 V, FDS7288N3, packaged in SO-8 FLMP (Flipchip in a Leaded Molded Package), has gate-drain charge to gate-source charge (Qgd:Qgs) ratio of less than 1. Wireless packaging technology provides junction-to-case, thermal, and electrical resistance in addition to package inductance.

Original Press Release:

Fairchild Semiconductor's Advanced MOSFET Technology Reduces Miller Charge by 35-40%: Exhibits Superior Switching and Thermal Performance in Synchronous Buck Applications

San Jose, Calif.-June 4, 2004-Fairchild Semiconductor (NYSE: FCS) announces its advanced-performance PowerTrench. MOSFET process technology that yields exceptionally low values for Miller Charge (Qgd), RDS(on), total gate charge (Qg), and improves gate-drain charge to gate-source charge (Qgd:Qgs) ratio enhancements that result in superior switching performance and thermal efficiencies when used in synchronous buck applications. The benefits of low Qgd are decreased switching losses and reduced "dead time" for improved regulation. A favorable Qgd:Qgs ratio offers immunity against false gate triggering that result in shoot-through currents between switching MOSFETs when employed as a synchronous rectifier. Low RDS(on) is critical in minimizing conduction losses and low Qg reduces the power consumed to turn the MOSFET on and off each cycle. Two new 30V MOSFETs from Fairchild, the FDS6294 and FDS7288N3, exhibit the benefits of this improved fast-switching technology, especially when applied, respectively, to notebook computers and POL (Point of Load) converter designs. With its very low Qgd, the new FDS6294 provides excellent performance in high-frequency, narrow duty cycle switching applications. Very fast switching is essential to high-efficiency synchronous buck power supply designs used in notebook computers. In this application, the typically large input-to-output voltage ratio and large voltage swing across the high-side MOSFET often leads to excessive switching losses if the device cannot turn on and off quickly. The extremely low Miller Charge (Qgd) value of 3nC (typical) of the FDS6294 minimizes this transition time, and in conjunction with a low RDS(on) of 11.3m ohm max, allows the device to offer superior performance to existing solutions. The FDS6294 is available in an SO-8 package. In addition to possessing the superior performance attributes of low Miller Charge, low RDS(on), low Qg, and a Qgd:Qgs ratio (less than 1), the new FDS7288N3 is packaged in a SO-8 FLMP (Flipchip in a Leaded Molded Package). This advanced wireless packaging technology provides extremely low junction-to-case thermal resistance, low electrical resistance, and low package inductance. Low junction-to-case thermal resistance is achieved by extracting heat directly from the under side of the package, which allows this device to perform much more efficiently than conventionally packaged MOSFETs. The lower electrical package resistance reduces static losses while the reduction in package inductance reduces the switching losses as well. The FDS7288N3's excellent thermal characteristics are ideally suited for high current density DC-DC power supply applications commonly found in POL (Point of Load) converters used in computer servers, telecommunications equipment and internet hubs and routers. The FDS7288N3 and FDS6294, coupled with the FAN5093 two-phase controller and driver combination, provide a complete POL solution; while the FDS7096N3 and FDS7288N3, in combination with the FAN5009 driver and FAN5019 controller, form a highly efficient system solution for VRM server applications. The FDS7288N3 is a lead-free (Pb-free) product that meets or exceeds the requirements of the joint IPC/JEDEC standard J-STD-020B and is compliant with the European Union requirements, which will take effect in 2005. David Grey, Fairchild's technical marketing manager, said, "Fairchild's new fast-switching MOSFET silicon technology, coupled with innovative packaging, substantially improves the performance of the upper side switch and the synchronous rectification function over our previous generation MOSFET products." Price: FDS6294 - US$ $0.78 and FDS7288N3 - US$ 1.52 (both per 1K pcs) Availability: Now Delivery: 8 weeks ARO For more information about these products go to www.fairchildsemi.com/pf/FD/FDS6294.html and www.fairchildsemi.com/pf/FD/FDS7288N3.html. For information on other Fairchild products, design tools, and sales contacts, please visit www.fairchildsemi.com. Fairchild Semiconductor: Fairchild Semiconductor (NYSE: FCS) is a leading global supplier of high performance products for multiple end markets. With a focus on developing leading edge power and interface solutions to enable the electronics of today and tomorrow, Fairchild's components are used in computing, communications, consumer, industrial and automotive applications. Fairchild's 9,000 employees design, manufacture and market power, analog & mixed signal, interface, logic, and optoelectronics products from its headquarters in South Portland, Maine, USA and numerous locations around the world. Please contact us on the web at www.fairchildsemi.com.