Infineon TLE4271-2G: A 5-V Low-Drop Voltage Regulator for Automotive and Industrial Applications

In the demanding environments of modern automotive electronics and industrial control systems, stable and reliable power supply is non-negotiable. The Infineon TLE4271-2G stands out as a monolithic integrated low-drop voltage regulator specifically engineered to meet these rigorous requirements. Delivering a fixed 5-V output voltage with a maximum output current of 450 mA, this IC is a cornerstone for powering microcontrollers, sensors, and other critical logic circuits.

A key feature of the TLE4271-2G is its remarkably low dropout voltage, typically only 400 mV at full load. This characteristic is vital for automotive applications, where the battery voltage can sag during engine cranking, often dipping below 6 V. The regulator continues to provide a stable 5-V output even when the input voltage is very close to the output level, ensuring system functionality during these critical low-voltage events.

Robustness and protection are central to its design. The device is inherently protected against overload, short-circuit, and overtemperature conditions. Furthermore, it incorporates reverse polarity protection, a common threat in automotive environments during battery handling or jump-starting. An integrated reset circuit with a programmable delay monitors the output voltage. This provides a defined reset signal to the microcontroller during power-up, power-down, or dropout events, ensuring a controlled and safe system state.

Compliance with the stringent AEC-Q100 standard confirms its qualification for automotive applications, guaranteeing performance across a wide operating temperature range of -40 °C to 150 °C for the junction temperature. Its ability to handle high input voltage transients, including load dump pulses, makes it exceptionally durable. Available in a PG-DSO-14 package with exposed pad for enhanced thermal performance, the TLE4271-2G is a compact and reliable solution for building resilient electronic systems.

ICGOODFIND: The Infineon TLE4271-2G is a highly robust, AEC-Q100 qualified 5-V low-drop voltage regulator. Its exceptional ability to maintain regulation with very low input-to-output differentials, combined with comprehensive protection features and a integrated reset generator, makes it an ideal and reliable power management solution for harsh automotive and industrial environments.

Keywords: Low-Dropout Regulator (LDO), Automotive Grade (AEC-Q100), 5-V Output, Overcurrent Protection, Reset Circuit