Infineon TLE4471G: A 5-V Low-Drop Voltage Regulator for Automotive and Industrial Applications

In the demanding environments of modern automotive electronics and robust industrial control systems, power management is critical. The Infineon TLE4471G steps into this arena as a monolithic, low-dropout (LDO) voltage regulator engineered to deliver a precise 5-V output, providing the stable and clean power essential for microcontrollers, sensors, and ASICs.

This IC is designed to handle a wide input voltage range from 5.5 V up to 45 V, making it exceptionally suited for the harsh electrical conditions found in vehicles, where load dump and transients are common. Its low dropout voltage—typically 500 mV at a full load current of 150 mA—ensures efficient operation even when the input voltage dips close to the output level, preserving system functionality during cranking or other low-voltage events.

A key feature of the TLE4471G is its very low quiescent current in its operational mode, which is crucial for applications requiring high efficiency. Furthermore, it includes a watchdog function and a reset output, which are indispensable for safety-critical automotive applications. The watchdog monitors the microcontroller, while the reset output initiates a controlled restart if the supply voltage deviates from its safe operating range, thereby enhancing system reliability and preventing undefined states.

The device is also packed with comprehensive protection features. These include reverse polarity protection, short-circuit protection, and overtemperature shutdown, safeguarding both the regulator itself and the downstream components from damage. Its ability to operate over a junction temperature range of -40 °C to 150 °C confirms its readiness for the most challenging under-the-hood automotive and industrial applications.

Housed in a PG-TO263-5-11 package, the TLE4471G offers excellent thermal performance, allowing it to dissipate heat effectively even under high load conditions.

ICGOOODFIND: The Infineon TLE4471G is a robust and feature-rich 5-V LDO regulator that stands out for its high reliability, integrated safety functions (watchdog/reset), and comprehensive protection suite. It is an ideal, single-chip power solution designed to meet the stringent requirements of the automotive industry and beyond.

Keywords: Low-Dropout (LDO) Regulator, Automotive Grade, Watchdog Timer, Reverse Polarity Protection, Thermal Shutdown.