Infineon TLE42644: A 5-V Low-Drop Voltage Regulator for Automotive and Industrial Applications

In the demanding worlds of automotive electronics and industrial control systems, power supply integrity is non-negotiable. The Infineon TLE42644 stands out as a monolithic integrated low-drop voltage regulator, engineered specifically to deliver a precise and stable 5-V output from an input voltage of up to 45 V. Its robust design and comprehensive feature set make it an ideal cornerstone for powering microcontrollers, sensors, and various logic circuits in harsh electrical environments.

A key attribute of this regulator is its remarkably low dropout voltage. With a typical drop of only 350 mV at a 150 mA load current, it ensures efficient operation and maintains regulation even when the input voltage dips close to the output level. This characteristic is crucial for automotive applications, particularly during cold-crank scenarios where the battery voltage can temporarily fall to very low levels.

The TLE42644 is designed for exceptional reliability. It incorporates a wide array of built-in protection features that safeguard both the IC itself and the downstream circuitry. These include:

Overcurrent Protection: Limits the output current to prevent damage during short-circuit conditions.

Overtemperature Protection: Shuts down the regulator if the junction temperature exceeds safe limits.

Reverse Polarity Protection: Withstands a negative voltage of up to -45 V on the input pin, a common threat in automotive systems due to faulty jump-starting.

ESD Protection: Offers high electrostatic discharge protection, enhancing durability during handling and operation.

Furthermore, the device boasts excellent line and load regulation, minimizing output voltage fluctuations caused by changes in input voltage or output current. An integrated reset circuit with a programmable delay monitors the output voltage. This power-on reset function provides a defined signal to a microcontroller, ensuring a controlled and safe start-up and shutdown sequence, which is vital for system stability.

Housed in a PG-DSO-14 package, the TLE42644 also offers an enable function, allowing for external switching of the regulator to reduce power consumption in standby modes.

ICGOOODFIND

The Infineon TLE42644 is a robust and highly reliable voltage regulator that excels in challenging applications. Its combination of low dropout voltage, extensive built-in protection (including reverse polarity and overcurrent), and the critical power-on reset function makes it a superior and trusted choice for designing resilient power supplies in automotive and industrial systems.

Keywords: Low-Dropout Regulator, Automotive Grade, Reverse Polarity Protection, Power-On Reset, 5V Output