Infineon TLE42754GATMA1 5V Low-Drop Voltage Regulator: Features and Application Circuit Design

The Infineon TLE42754GATMA1 is a monolithic integrated low-drop voltage regulator designed to deliver a fixed 5V output with a maximum current of 450 mA. Housed in a space-efficient PG-TO252-3 (DPAK) package, this IC is engineered for robustness and reliability in the demanding environments of automotive and industrial electronics. Its low dropout voltage of typically 200 mV at 150 mA load makes it exceptionally efficient, especially in applications where the input voltage is only marginally higher than the regulated output.

A key strength of this regulator is its integrated protection features, which are critical for operational safety. These include overload protection, short-circuit protection, and overtemperature shutdown. Furthermore, the device incorporates reverse polarity protection, a vital attribute for automotive applications where battery connection errors can occur. The TLE42754 also boasts a very low quiescent current in both operating and standby modes, enhancing energy efficiency.

The device includes an enable (EN) pin, allowing for external logic control to turn the regulator on or off, which is ideal for power management sequences in complex systems. The error output (ERR) pin provides a signal to a microcontroller if the output voltage falls out of regulation due to an undervoltage or overtemperature condition, enabling sophisticated system monitoring.

Application Circuit Design

A typical application circuit for the TLE42754GATMA1 is straightforward to implement, yet a few considerations are paramount for stable and reliable performance.

The core design requires only two external capacitors. An input capacitor (C_IN) of at least 1 µF is necessary to ensure stability and to suppress any incoming voltage transients. It should be placed as close as possible to the VIN and GND pins of the IC. Similarly, a output capacitor (C_OUT) in the range of 1 µF to 22 µF with an ESR between 0.5 Ω and 10 Ω is required for stability and to improve the regulator's transient response. For most applications, a 2.2 µF ceramic capacitor is sufficient.

When utilizing the enable function, the EN pin can be driven directly by a microcontroller's GPIO pin. A pull-down resistor (e.g., 100 kΩ) can be added to ensure a defined 'off' state if the pin is left floating. The ERR pin is an open-drain output that requires an external pull-up resistor (e.g., 10 kΩ) to a logic-level voltage supply (e.g., 3.3V or 5V). This line can then be monitored by a host microcontroller for fault conditions.

For optimal thermal performance, the PCB layout must provide an adequate copper area for the DPAK tab, which acts as the primary heat sink. This is crucial for dissipating heat, especially when operating at high load currents or with a small input-to-output voltage differential.

ICGOODFIND Summary

The Infineon TLE42754GATMA1 is a highly robust and feature-rich 5V low-dropout regulator. Its excellent combination of low quiescent current, comprehensive protection mechanisms, and logic control interfaces makes it an superior choice for power supply design in automotive body control modules, sensor systems, and industrial control units. Its simple application circuit belies its advanced capabilities, offering designers a reliable and efficient power management solution.

Keywords: Low-Dropout Regulator, Overcurrent Protection, Automotive Grade, Enable Pin, Thermal Shutdown