Infineon Announces 25V OptiMOS Voltage Regulation MOSFET and DrMOS Families Achieving 93 Percent Efficiency in Typical Server Applications

With significant reductions in three critical Figures of Merit (FOM) for efficiency, the new devices reduce MOSFET power losses up to 20 percent and deliver optimized performance across all load conditions. Additionally, higher power density makes it possible to reduce the circuit board footprint of the buck converter by more than 40 percent in a typical power supply.

For example, in a 6-phase voltage regulator design, the new 25V OptiMOS devices deliver peak efficiency of 93 percent and greater than 90 percent efficiency across the output current range of 30A to 180A using a 5V gate drive. Device characteristics contributing to this efficiency include the industry’s lowest on-state resistance, lowest gate charge and lowest output capacitance. Infineon believes it is the first power MOSFET supplier to provide devices with all three of these characteristics optimized for efficiency.

According to several market research firms, up to 60 million servers will be in use by 2011. A server consumes an average of 600 W which corresponds to a global consumption of 36 GW. Even a reduction in demand by 1 percent, corresponding to 360 MW, would be equivalent to the capacity of a hydroelectric power station. Additionally, more efficient power supplies have reduced cooling demands, further lowering the electrical energy consumption.

“More efficient energy utilization and consequently electricity that we do not use will represent our greatest energy resource in the future and Infineon heavily contributes to these efforts,” said Richard Kuncic, Director, Product Line Low Voltage MOSFETs at Infineon Technologies. “Infineon offers very powerful and efficient MOSFET solutions for applications in industrial, telecommunications, as well as in the consumer and home appliance areas. We set the benchmark for MOSFET performance and are committed to expanding our position as the top supplier of devices to enable the greatest possible energy efficiency in power supplies. With this new 25V OptiMOS series, we are enabling designs that reduce power use and lower costs for our customers.”

Power supply designers can use the 25V OptiMOS devices to reduce electricity use, lower thermal load and even shrink the size of their products. These improvements are highly valued by data center operators for several reasons including the fact that the cost of electricity to power servers and provide cooling is the largest single operating budget item in facilities. Reducing the entire system footprint also is highly valued by end-user organizations.

Infineon offers the new 25V OptiMOS discretes in three package types; SuperSO8, CanPAK and the exceptionally small S3O8, which measures just 3.3 mm x 3.3 mm. With the S3O8, a 6-phase converter design can be achieved in just 1120 sq mm, a footprint reduction of 45 to 55 percent compared to the other two package types. The new DrMOS device, the TDA21220, is a multi-chip package integrating two new OptiMOS transistors and a driver IC. It features an efficiency that is 2 to 4 percent higher than comparable solutions on the market.

The OptiMOS25V products are superior in efficiency relevant Figure of Merits compared to both the low R DS(on) trench technologies and the ultra low gate charge lateral MOSFET concepts. In a comparison based on the same on-state resistance, the new OptiMOS 25V product offers a 35 percent lower gate charge compared to the next best trench based product and a 50 percent lower output charge compared to the best lateral MOSFET.