Infineon Technologies has introduced Power Profet, an ohmic smart high-side switch that offers low on-resistance and high energy capability, enabling the replacement of electromechanical relays and fuses in power distribution and junction boxes up to 40A DC.

The Power Profet switches feature on-resistances down to 1.0mΩ and are specially designed to drive high-current applications. These comprise power feeds of electronic control units (ECUs), auxiliary power outlets, PTC heaters or rear window heaters. The switches are also well-suited for applications with high switching cycles and high energy requirements such as starter relays in “start-stop” systems and electric brake vacuum pumps. Power Profet switches improve vehicle system reliability. They offer integrated protection functions and diagnostics functionality including, for example, short circuit protection and over-temperature protection.

The switches increase energy efficiency as power losses are reduced by a factor of up to 7, according to the company. They feature less than 2W dissipation while conducting 30A DC. Further power management is supported through integrated current sensing and pulse-width modulation capability. In addition, Power Profet switches offer a benchmark energy handling capability of up to 3,000mJ for single pulses and 550mJ for repetitive pulses. For most applications, this eliminates the need for a free-wheeling current recirculation path and thus reduces the system cost.

The switches provide an outstanding protection performance of more than 1,000,000 short-circuit cycles, achieving Grade A according to AEC-Q100. In case of a single over-current event, a re-start strategy can be implemented via a software reset. There is no need to access or replace a part any longer. At the system level, Power Profet switches enable a more accurate system sizing. Also, they simplify significantly the wire harness architecture by reducing the lengths of many wires or removing them completely.

The Power Profet family consists of four pin-compatible switches controlling currents from 20A to 40A DC. They share the same feature set. Only their on-state resistance R DS(ON) scales with 1.0mΩ, 1.5mΩ, 2.0mΩ, or 2.5mΩ for each device. The two lowest ohmic devices of the family, the BTS50010-TAD with 1.0mΩ and the BTS50015-1TAD with 1.5mΩ, are already available for high-volume. Further Power Profet switches start mass production in early 2017.