Fairchild Semiconductor's 30V Synchronous Buck Chip Set Optimizes Efficiency and Space in IMVP4/6 Vcore Designs.

SAN JOSE, Calif. -- Low Gate Charge Chip Set Increases Current Density and Switching Performance in a Range of Synchronous Buck Converter Applications

Fairchild Semiconductor (NYSE:FCS) introduces a synchronous buck converter chip set designed specifically to optimize efficiency and space in notebooks using the latest IMVP (Intel Mobile Voltage Positioning) specifications. Utilizing Fairchild's PowerTrench(R) MOSFET technology, the high-side "control" MOSFET (FDS6298) and the low-side "synchronous" MOSFET (FDS6299S) form a chip set providing increased current density and improved efficiency in synchronous buck converter applications. In addition, the FDS6299S device's monolithic SyncFET(TM) technology eliminates the need for an external Schottky diode, resulting in board space savings and reduced assembly costs.

"Fairchild's PowerTrench technology supports a feature-set that results in high efficiency. In synchronous buck converter applications, performance is usually benchmarked in terms of efficiency. Better efficiency usually translates to lower die temperature, improved reliability, and it can also be an indicator of improved electromagnetic compatibility, or EMI," said David Grey, Fairchild's marketing manager for Computing Solutions. "Our technology also reduces the occurrence of high current spikes due to shoot-through, resulting in less ringing and radiated electromagnetic noise. Furthermore, by using an integrated SyncFET(TM) device in the matched pair, Fairchild's FDS6298/FDS6299S chip set reduces part count compared to solutions requiring an external Schottky diode."

This integrated chip set features a very low Qgd or "Miller" charge for fast switching speeds as well as a Qgd / Qgs ratio of less than 1 to limit the potential for cross-conduction losses. In addition to Vcore designs, the fast-switching FDS6298 and the low RDS(on) FDS6299S offer benefits as a matched pair that are well suited for high current point-of-load (POL) converters in such applications as high-end communications equipment.

Key performance characteristics of the FDS6298 (high-side) MOSFET include:

--Low total Qg (9nC @ VGS=4.5V) and Qgd (3nC @ VGS=4.5V) for fast-switching speeds to increase efficiency;

--Optimized die and lead frame design to reduce package resistance and inductance, reducing conduction and source terminal inductance switching losses; and

--Rg-specified and 100% Rg-tested resulting in a well-defined drain-source switching characteristic.

Key performance characteristics of the FDS6299S (low-side) MOSFET include:

--Low RDS(on) (3.9mOhm (max) @ VGS = 10V) to reduce DC losses;

--Low body diode loss (low QRR and low forward voltage drop) to improve efficiency;

--Soft-recovery characteristic to lower noise, and low Crss to reduce the potential for cross conduction; and

--Low total Qg (31nC @ VGS=5V) for reducing gate drive requirements.

These products are available in a lead (Pb)-free SO-8 package that meets or exceeds the requirements of the joint IPC/JEDEC standard J-STD-020B and are compliant with the European Union requirements now in effect.

The FDS6298/FDS6299S synchronous buck converter chip set is an example of how Fairchild uses innovative technology to address the specific concerns of computing applications. Fairchild offers a variety of complementary products to fulfill the challenges presented by today's designs, including linear power amplifiers, multi-phase DC/DC controllers, and multiple point-of-load products such as LDOs.

For more information about these products please go to http://www.fairchildsemi.com/pf/FD/FDS6298.html and http://www.fairchildsemi.com/pf/FD/FDS6299S.html. For information about other Fairchild products, design tools, and sales contacts, please visit http://www.fairchildsemi.com.

Price (each, 1000 pcs): US$ 0.62 -- FDS6298
                        US$ 1.18 -- FDS6299S

Availability:           Now

Delivery:               12 weeks from ARO

Editor's Note: Datasheets of these products in PDF format can be found online at:

http://www.fairchildsemi.com/ds/FD/FDS6298.pdf

http://www.fairchildsemi.com/ds/FD/FDS6299S.pdf

About Fairchild Semiconductor:

Fairchild Semiconductor (NYSE:FCS) is the leading global supplier of high-performance power products critical to today's leading electronic applications in the computing, communications, consumer, industrial and automotive segments. As The Power Franchise(R), Fairchild offers the industry's broadest portfolio of components that optimize system power through minimization, conversion, management and distribution functions. 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.