Fairchild Semiconductor's 30V Synchronous Buck Chip Set Optimizes Efficiency and Space in IMVP4/6 Vcore Designs
October 31 2005 - 11:00AM
Business Wire
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. -0- *T Price (each, 1000
pcs): US$ 0.62 -- FDS6298 US$ 1.18 -- FDS6299S Availability: Now
Delivery: 12 weeks from ARO *T 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.
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