Infineon TLE4678EL: A Comprehensive Overview of the Low-Drop Voltage Regulator

The Infineon TLE4678EL is a monolithic integrated low-drop voltage regulator designed for a wide range of automotive and industrial applications. Engineered to deliver exceptional performance in harsh electrical environments, this IC provides a stable 5 V or 3.3 V output voltage from an input supply of up to 45 V, making it an ideal power management solution for 12 V and 24 V vehicle systems.

A key feature of the TLE4678EL is its remarkably low dropout voltage, typically 200 mV at a 150 mA load current for the 5 V version. This high efficiency minimizes power dissipation, which is critical for thermal management in space-constrained electronic control units (ECUs). The device is capable of supplying a maximum output current of 150 mA, sufficient to power microcontrollers, sensors, and other critical logic components.

Beyond basic regulation, the TLE4678EL is built for robustness and reliability. It incorporates comprehensive protection features, including overcurrent protection (OCP), overtemperature shutdown (TSD), and reverse polarity protection. A critical function for automotive safety is its integrated reset circuit with an adjustable delay time. This circuit monitors the output voltage and generates a reset signal for the microcontroller if the supply voltage dips below a defined threshold, ensuring a controlled system startup and shutdown.

The regulator also features an enable input that allows external control of the device, facilitating power sequencing and sleep mode functionality to reduce quiescent current in battery-operated systems. Housed in a PG-TO252-5-11 (DPAK) package, the TLE4678EL offers excellent thermal performance for dissipating heat directly to the PCB.

ICGOOODFIND: The Infineon TLE4678EL stands out as a highly robust and feature-complete low-dropout regulator. Its combination of a wide input voltage range, comprehensive protection mechanisms, and the vital integrated reset generator makes it a superior and reliable choice for demanding automotive applications, ensuring stable operation and safeguarding sensitive electronic components.

Keywords: Low-Dropout Regulator, Automotive Grade, Reset Circuit, Overcurrent Protection, Thermal Shutdown