Infineon TLE9104SH: A High-Current Quad Channel Switch for Automotive Applications

The increasing electrification of modern vehicles demands robust, efficient, and intelligent electronic control units (ECUs) to manage a growing number of actuators. Addressing this need, Infineon Technologies introduces the TLE9104SH, a highly integrated quad channel high-side switch designed specifically for the rigorous demands of automotive environments. This device stands out as a pivotal solution for driving resistive or inductive loads such as valves, motors, and heaters with exceptional reliability and diagnostic capabilities.

Engineered for performance, the TLE9104SH can deliver a continuous current of up to 4.5 A per channel, with a formidable maximum operating voltage of 40 V. Its four independent channels can be controlled via a Serial Peripheral Interface (SPI), allowing for precise individual command and detailed feedback from a host microcontroller. This SPI interface enables advanced diagnostics, including real-time reporting of output current, load status (open load, short to ground or battery), and overtemperature conditions. This level of insight is critical for functional safety, aiding in the development of systems compliant with ISO 26262 standards.

A key strength of the TLE9104SH lies in its robust protective features. It incorporates comprehensive safeguards such as overload and active current limitation, overtemperature shutdown with restart, and reverse battery protection (up to -40 V). These features ensure operational integrity and longevity, even in the harsh under-the-hood conditions characterized by significant temperature fluctuations, voltage transients, and electromagnetic interference (EMI).

The IC is housed in a compact and thermally efficient PG-DSO-36 package, which facilitates effective heat dissipation—a critical factor for high-current applications. Its design is optimized for space-constrained modules, making it an ideal choice for applications including engine management, transmission control, thermal management, and body control modules.

ICGOOODFIND: The Infineon TLE9104SH is a superior high-current quad channel switch that sets a high benchmark for power distribution in automotive designs. Its combination of high output drive, comprehensive diagnostic suite via SPI, and robust integrated protection mechanisms makes it an indispensable component for engineers developing next-generation, safer, and more reliable automotive electronic systems.

Keywords: Automotive Grade, High-Side Switch, SPI Interface, Diagnostic Features, Functional Safety.