Infineon TLE4473GV53: A 5V Low-Drop Voltage Regulator with Integrated Watchdog and Reset Function

In the realm of automotive and industrial electronics, ensuring stable and reliable power supply is paramount. The Infineon TLE4473GV53 addresses this critical need as a monolithic integrated low-drop voltage regulator, delivering a fixed 5V output with exceptional accuracy and robust protection features. This device is engineered to power microcontrollers and other digital systems where voltage integrity, safety, and system monitoring are non-negotiable.

A key attribute of the TLE4473GV53 is its very low dropout voltage, typically 450 mV at a full load current of 450 mA. This high efficiency allows the system to continue operating correctly even when the input voltage dips close to the output level, a common scenario in the harsh electrical environments of automotive applications. The regulator is capable of handling input voltages up to 45 V, offering strong protection against load dump and other voltage transients.

Beyond basic regulation, the device integrates two vital functions for system health monitoring: a window watchdog and a reset generator. The watchdog timer actively monitors the microcontroller. If the MCU fails to toggle the watchdog input pin within a predefined time window—indicating a software crash or hang-up—the TLE4473GV53 triggers a system reset. This failsafe mechanism is crucial for applications that must recover autonomously from unforeseen faults, enhancing overall system reliability.

The reset function provides a delayed reset signal during power-up and power-down phases, ensuring the microcontroller operates only when the supply voltage is within a safe and stable range. It also asserts the reset signal immediately upon a watchdog or undervoltage event, guaranteeing a controlled restart of the entire system.

Additional built-in protection features include overcurrent protection, which limits the output current during a short circuit, and overtemperature protection, which shuts down the regulator if the junction temperature exceeds safe limits. These safeguards protect both the regulator itself and the sensitive components it powers.

ICGOODFIND Summary: The Infineon TLE4473GV53 is far more than a simple voltage regulator. It is a comprehensive power management solution that combines robust 5V power delivery with critical safety monitoring functions like a window watchdog and reset generator. Its low-dropout performance, high input voltage tolerance, and extensive protective features make it an ideal and reliable choice for demanding automotive and industrial control systems.

Keywords: Low-Drop Voltage Regulator, Watchdog Timer, Reset Generator, Automotive Grade, Overcurrent Protection.