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Fairchild's Integrated FET Module Delivers 50 Percent Space-Savings in Synchronous Buck Converter Designs

21st September 2007

Fairchild Semiconductor

ES Admin

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Fairchild Semiconductor ’s FDMS9600S and FDMS9620S are two highly integrated modules that significantly reduce board space while providing the ability to achieve higher conversion efficiency in synchronous buck designs. Each module in the FDMS96xx series combines a high-side and low-side N-Channel MOSFET and one monolithically integrated Schottky diode into a single, space-efficient, 5mm x 6mm MLP package. This integration results in a highly efficient solution for severely space-constrained applications such as notebook computers, small form factor desktops, media center PCs, ultra-dense servers, blade servers, advanced gaming systems, graphic cards, networking and telecom equipment, and other DC-DC designs.

Each FDMS96xx module integrates three separate discrete components into a single MLP package, thereby saving more than 50 percent board space. Conventional synchronous buck converters typically include two SO8-packaged MOSFETs and one Schottky diode.

The FDMS96xx series also offers a thermally efficient solution due to careful selection of the modules’ internal MOSFETs to thermally balance both the high- and low-side FETs for optimal temperature distribution within the package. By distributing heat uniformly throughout the device, the overall temperature of the package surface is minimized. This, in turn, reduces heat in the actual system, an important benefit in applications such as notebook computers or ultra-dense servers.

The pin-out of the FDMS96xx series has been carefully designed for a direct and easy connection in PCB layouts to standard PWM controllers. This innovative package concept shortens design time and reduces parasitic inductances in board layout traces, improving overall system efficiency.

Key benefits of the FDMS96xx series include:

-50 percent space savings compared to conventional discrete solutions
-Higher conversion efficiency solution compared to conventional discrete solutions
-Ease of board layout to simplify designs and accelerate time to market

The FDMS96xx series is part of Fairchild’s comprehensive portfolio of integrated DC/DC solutions that offer optimal combinations of controllers, drivers and MOSFETs in a broad range of performance and size specifications.

The FDMS96xx series 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. All of Fairchild's products are designed to meet the requirements of the European Union's Directive on the restriction of the use of certain substances (RoHS).