TLE4253E: Infineon's Low-Dropout Voltage Regulator for Automotive and Industrial Applications

In the demanding worlds of automotive electronics and industrial control systems, power management is paramount. Components must deliver unwavering reliability under extreme conditions, including wide temperature fluctuations, voltage spikes, and significant electromagnetic interference. Addressing these critical needs, Infineon Technologies' TLE4253E stands out as a robust and highly integrated low-dropout (LDO) voltage regulator.

The TLE4253E is a monolithic integrated fixed-voltage regulator designed to supply microprocessors and other logic circuits with a stable 5V or 3.3V output. Its core strength lies in its exceptionally low dropout voltage, typically just 200 mV at a 150 mA output current. This high efficiency allows it to continue regulating the output voltage even when the input voltage dips very close to the desired output level, a crucial feature during cold-crank conditions in automotive applications when the battery voltage can sag dramatically.

Beyond its basic regulation function, the TLE4253E is engineered for maximum system security. It features a comprehensive suite of built-in protection mechanisms. These include current limitation and overtemperature shutdown to safeguard both the IC and the load under fault conditions. Furthermore, it incorporates a reset circuit with a programmable delay time. This power-on reset (POR) function monitors the output voltage and holds the connected microprocessor in a safe reset state until the supply voltage has stabilized at a sufficient level, ensuring controlled and predictable system start-up.

Another significant advantage is its very low quiescent current in standby mode, making it an excellent choice for applications requiring always-on functionality without draining the battery. Its high immunity to electrostatic discharge (ESD) and reverse polarity protection on the input line further solidify its reputation for ruggedness.

The device is offered in a space-saving, thermally enhanced PG-SOT223-4 package, which is ideal for the compact PCB designs common in modern applications. It is AEC-Q100 qualified, meeting the stringent reliability standards for automotive components, and is also perfectly suited for harsh industrial environments involving PLCs, sensors, and actuators.

ICGOODFIND: The Infineon TLE4253E is a quintessential power management solution, masterfully balancing performance, integration, and resilience. Its combination of low dropout voltage, multiple protection features, and the critical microprocessor reset function makes it an indispensable and reliable choice for designers building robust systems for the automotive and industrial sectors.

Keywords:

Low-Dropout (LDO) Regulator

Automotive Qualified (AEC-Q100)

Microprocessor Reset

Current Limitation

Power Management