As relays and fuses cannot meet the requirements of modern E/E vehicle architectures, partial or complete electrification of primary and secondary power distribution must be taken into consideration. To solve this problem, Infineon Technologies has launched a new generation of ultra-low ohmic high-side switches in a TO-leadless package, the Power PROFET+ 12V switch family.
Power PROFET+ 12V enables new mounting locations and new enclosure options, enabling the next generation of decentralized power architectures with high efficiency.
Two variants are available: the BTS50005-1LUA with a resistance (R DS(ON) ) of 0.6 mΩ and the BTS50010-1LUA with an R DS(ON) of 1.0 mΩ for the lowest power losses. They are designed to control high current applications, especially in hot cabin and engine compartment environments for high starting currents, such as in heaters, pumps and fans. They provide over 1,000,000 switching cycles compared to, for example, an average of 200,000 switching cycles for a relay.
The switches can replace electromechanical relays, fuses and discrete circuits in power distribution boxes and other applications up to 65 A in a 12 V electrical system.
Furthermore, the switches offer integrated protection and diagnostic functions such as short circuit, overcurrent and overtemperature protection. As a result, the devices are fully protected and provide a fault signal via the diagnostic enable pin to a connected microcontroller for advanced diagnostics on power distribution modules. With their robustness, protection and diagnostic features, the switches improve the reliability of the entire vehicle, avoiding failure modes in the power panel network.
The smart power switches are housed in an 8-pin lead-free TO package, reducing footprint by 23% compared to the D2PAK while providing similar thermal performance. Load current detection accuracy has been improved by up to 5% and can be assessed by reading an analog voltage at the IS pin. Additionally, the switch family is PRO-SIL ISO 26262 ready and comes with a security application note that supports the evaluation of hardware elements according to ISO 26262.
To enable an easy design process for Power PROFET +12V devices, the family is integrated with the Infineon Smart Power Switches Intrinsic Fuse tool and the Infineon Smart Power Switches kILIS tool, both available in the Infineon Developer Center.
The Smart Power Switches Intrinsic Fuse tool allows you to calculate the intrinsic fusion characteristic based on the integrated overheating protection of the respective selected product under certain boundary conditions. The kILIS tool is used to calculate and visualize the sensing current range for specific load currents in the respective selected product, taking into consideration the kILIS rating, sensing resistor, and ADC tolerances.
