Infineon Launches CoolMOS CS Series Power Transistors

Infineon Technologies AG (Germany) launched its CoolMOS™ CS Series of high-performance power transistors, designed for power supplies used in computer servers and other high-end applications such as telecom equipment and flat panel displays. Heat generated by the power supply can be a major problem and leads to costly thermal management efforts.

Based on a technical breakthrough that allows them to overcome the so-called silicon limit for performance, the new CoolMOS CS MOSFETs have a low on-state resistance of 99 mΩ in a standard TO 220 package, or 45 mΩ in a standard TO 247 package, coupled with fast switching speeds of 150 V/ns and a 600 V voltage blocking capability.

Infineon is demonstrating a 1,000 W reference design for a server power supply, with one 99 mΩ CoolMOS CS power transistor. It produces 1.5% higher efficiency compared to a similar power supply made using two commonly available, standard 250 mΩ MOSFETs, placed in parallel. This increased efficiency results in more than 10% system cost reduction per watt. In addition, Infineon is also demonstrating a 1,500 W power-factor correction design, which achieves 99% efficiency with a 99 mΩ CoolMOS CS power transistor.

The first products in the CoolMOS CS Series are 45 mΩ in a TO247 package and 99 mΩ in a TO220 and TO247 package. Samples will be available next month, with volume production expected to start in May 2005. The unit price for a 99 mΩ device in a TO220 package will be less than €3.00, for orders of more than 100,000 pieces.