San Jose, Calif. Fairchild Semiconductor has introduced the XS DrMOS, which the company claims as the industry's first high-performance and 6 x 6-mm DrMOS solution for synchronous dc/dc buck regulators for computing, game console and consumer point-of-load (PoL) applications. The FDMF6704 is a FET-plus-driver module that replaces one driver IC, one high-side MOSFET, two low-side MOSFETS and one bootstrap Schottky diode in an ultra-compact package.
"Today, the major portion of the market is occupied by discrete solutions where a typical buck converter circuit requires three components a controller, driver and MOSFET and when all these parts are used as discretes there are a lot of challenges," said Arvind Ravishunkar, senior product marketing engineer, multi-chip modules.
The DrMOS is said to eliminate these challenges, which include higher parasitics, layout issues, and larger solution side.
The DrMOS delivers higher efficiency levels in a small package, higher frequency operation for further reducing space, and dramatically reduced ringing that allows designers to further reduce space and improve efficiencies, said Robert Guerrero, senior worldwide segment manager at Fairchild. It also is compatible with a variety of PWM controllers for greater design flexibility and follows Intel's industry standard [for a FET plus driver multi-chip module] that will allow customers to have second sources in the future, added Guerrero.
One of the key benefits of the DrMOS is higher system efficiency through optimization along with package modifications to achieve the best possible use of the package and best possible PCB interface, which provide higher efficiencies than conventional discrete solutions in the market, said Ravishunkar. In addition, the efficiency level is maintained across the entire load ranges light, medium and high, which leads to lower parasitics to allow for higher efficiency levels at higher frequencies, he said.
In addition, the use of a 5-V gate driver circuit together with the improved PCB interface dissipates more heat, guarantees higher performance, and achieves higher efficiency, added Ravishunkar.
Another benefit is the small package. The thermally enhanced 6 x 6-mm MLP package saves 84 percent board space compared to discrete solutions and 44 percent compared to 8 x 8-mm MLP packaged DrMOS modules. Even though the area is almost shrunk in half, it has not compromised the power handling capability; the DrMOS can handle up to 35 amps of current at 300 kHz, said Ravishunkar.
It also delivers 92 percent peak efficiency, enabling applications to meet stringent energy-efficiency specifications such as ENERGY STAR, Climate Savers and Green Grid.
The FDMF6704 has been designed and optimized to work with a wide variety of controllers in the market. It is compatible with both Tri-State and Non-Tri-State PWM controllers. To further ensure compatibility, the FDMF6704 has its PWM threshold levels tailored to meet a broad range of controllers available in the market.
Fairchild's advanced SyncFET technology is integrated within the module's low-side MOSFET, which dramatically reduces ringing, and thus, the need for snubber circuits typically used to reduce noise. The module is also furnished with a diode emulation (SMOD) function for increased light loading efficiency.
The FDMFxxxx series is a complete family of fully optimized, integrated FET-plus-driver multi-chip power stage modules designed for multiple synchronous buck converter applications. These multi-chip modules are designed to achieve the optimal solution for a given application by using components that are matched electrically, thermally and mechanically, said the company.
The FDMF6704 utilizes lead-free (Pb-free) terminals and has been characterized for moisture sensitivity in accordance with the Pb-free reflow requirements of the joint IPC/JEDEC standard J-STD-020. The devices are RoHS compliant.
Pricing: $1.50 each in quantities of 1,000.
Availability: Samples are available now. Delivery is 12 week ARO.
Fairchild Semiconductor, www.fairchildsemi.com