Infineon TLS850F1TAV50: Key Features and Application Design Considerations

The Infineon TLS850F1TAV50 is a high-performance, low-dropout (LDO) voltage regulator designed to meet the stringent requirements of modern automotive and industrial applications. As a part of Infineon’s trusted product portfolio, this LDO provides a robust power management solution, especially in environments where reliability, precision, and safety are paramount.

Key Features

One of the standout attributes of the TLS850F1TAV50 is its wide input voltage range from 3.0 V to 40 V, making it exceptionally versatile for use in 12 V and 24 V automotive systems that must handle load-dump and start-stop conditions. The device delivers a fixed, highly accurate output voltage of 5.0 V with a maximum output current of 150 mA, sufficient for powering microcontrollers, sensors, and other critical low-power loads.

The regulator boasts an extremely low dropout voltage, typically 200 mV at 100 mA load, ensuring efficient operation even when the input voltage is very close to the output level. Furthermore, it features outstanding voltage accuracy of ±2% over the entire temperature range, which is critical for precision analog and digital circuits.

A key highlight is its comprehensive suite of integrated protection functions. These include over-current protection (OCP), thermal shutdown (TSD), reverse polarity protection, and over-voltage protection (OVP) on the input side. The active-enabled discharge resistor ensures a controlled shutdown of the output, enhancing system safety. The device is also AEC-Q100 qualified, underscoring its suitability for automotive applications.

Application Design Considerations

When integrating the TLS850F1TAV50 into a design, several factors must be considered to ensure optimal performance. First, proper input and output capacitor selection is crucial for stability and transient response. While the LDO is stable with small ceramic capacitors (≥1 µF), a larger output capacitor may be necessary to improve load transient performance.

Thermal management is another critical aspect. Although the package (PG-TO252-5-11) offers good thermal performance, the maximum junction temperature of 150 °C must not be exceeded. Designers must calculate the power dissipation (P_DISS = (V_IN - V_OUT) I_OUT) and ensure adequate PCB copper area or heatsinking is provided to keep the die temperature within safe limits, especially in high-ambient-temperature environments like an automotive engine control unit (ECU).

The enable (EN) pin allows for external control of the regulator, facilitating power sequencing and sleep modes to reduce quiescent current in always-on systems. Designers should ensure the EN signal is clean and free from noise to prevent unintended toggling.

Given its automotive focus, the design must account for electromagnetic compatibility (EMC). The LDO’s internal design offers good noise rejection, but careful PCB layout—such as using short, direct traces for input and output capacitors and minimizing loop areas—is essential to mitigate noise injection and ensure system-level EMC compliance.

ICGOODFIND: The Infineon TLS850F1TAV50 stands out as a highly reliable and feature-rich LDO regulator, engineered for the demanding conditions of automotive electronics. Its robust protection features, high accuracy, and wide operating range make it an excellent choice for designers seeking to enhance system reliability and performance.

Keywords: LDO Regulator, Automotive Grade, Wide Input Voltage, Thermal Shutdown, AEC-Q100.