Infineon TLE8209-1R: A 16-Channel Low-Side Switch for Automotive Applications

The increasing complexity of modern automotive electronic systems demands robust, reliable, and highly integrated solutions for driving a multitude of loads. From controlling solenoids and valves to managing lamps and heaters, low-side switches are fundamental building blocks. The Infineon TLE8209-1R stands out as a premier solution, engineered specifically to meet the stringent requirements of the automotive environment.

This device is a monolithic integrated 16-channel low-side switch, fabricated using Infineon's proprietary SPI (Serial Peripheral Interface) for advanced diagnostics and control. This allows a microcontroller to command each of the 16 channels independently with precise on/off timing and to receive detailed feedback on their status.

Robustness and Diagnostic Capabilities are at the core of the TLE8209-1R's design. Each channel is protected by an internal charge pump and free-wheeling diode, making it ideal for driving inductive loads like solenoids and relays. The chip provides comprehensive diagnostic feedback, including open-load detection both in on-state and off-state, overload and short-circuit protection, and overtemperature warning and shutdown. This level of diagnostic detail is crucial for functional safety applications, enabling the system to identify and respond to faults before they lead to failure.

Designed for the harsh automotive environment, the TLE8209-1R operates over a wide supply voltage range and is qualified for automotive applications according to AEC-Q100. It features very low standby current, making it suitable for always-on systems where power consumption is critical. Its ability to handle high in-rush currents, common when incandescent lamps are switched on, further demonstrates its robustness.

Typical applications are vast, spanning across body control modules, engine management systems, and comfort electronics. It is perfectly suited for use in relay and solenoid drivers, lamp control units, and heater control modules. By integrating 16 channels into a single package, it significantly reduces the component count on the PCB, saves space, lowers system cost, and enhances overall reliability.

ICGOOODFIND: The Infineon TLE8209-1R is a highly integrated, robust, and intelligent 16-channel low-side switch that sets a high standard for automotive power management. Its combination of high channel count, advanced SPI-based diagnostics, and proven automotive ruggedness makes it an exceptional choice for designers building next-generation vehicle electronic systems.

Keywords: Automotive, Low-Side Switch, Diagnostic, SPI, AEC-Q100.