Infineon TLE4274GSV33 5V to 3V Low-Dropout Voltage Regulator: Datasheet, Pinout, and Application Circuit Guide

The Infineon TLE4274GSV33 is a monolithic integrated low-dropout voltage regulator designed to deliver a fixed 3.3V output voltage at a maximum current of up to 450 mA from an input voltage of up to 42V. Housed in a thermally enhanced PG-TO263-5 (DPAK-5) package, this IC is engineered for robust performance in the harsh environments typical of automotive applications, though its versatility makes it equally suitable for industrial and consumer electronics.

Key Features and Datasheet Highlights

According to its datasheet, the TLE4274GSV33 boasts an impressive set of features. Its very low current consumption in standby mode (typ. 15 µA) makes it ideal for battery-powered systems. Key protections are integral to its design, including overload protection, short-circuit protection, and overtemperature shutdown. A critical feature is its reverse polarity protection, which can withstand voltages down to -42V, safeguarding the circuit during installation errors or voltage transients. Furthermore, the device offers excellent stability with low ESR ceramic output capacitors, simplifying design and reducing bill-of-materials costs.

Pinout Configuration

Understanding the pinout is crucial for proper PCB layout:

Pin 1 (IN): Input Voltage. This pin connects to the supply voltage (up to 42V). A ceramic capacitor must be placed close to this pin.

Pin 2 (GND): Ground. The common ground reference for the IC.

Pin 3 (EN): Enable. A logic high signal (> 2V) activates the regulator; a logic low (< 0.8V) puts it into low-power standby mode. This pin should not be left floating.

Pin 4 (NC): Not Connected. This pin is internally isolated.

Pin 5 (OUT): Output Voltage. Provides the regulated 3.3V output. A minimum output capacitor is required for stability.

Application Circuit Guide

A typical application circuit for the TLE4274GSV33 is straightforward. The input voltage (e.g., 5V or 12V) is fed to Pin 1 (IN) and decoupled to ground with a 1 µF ceramic capacitor placed as close as possible to the IC. The output (Pin 5, OUT) requires a capacitor for stability; a 1 µF ceramic capacitor is sufficient, though a larger value (e.g., 2.2 µF to 10 µF) can improve transient response. The Enable pin (EN) can be tied directly to the input (IN) for always-on operation or connected to a microcontroller's GPIO pin for digital control to conserve power.

For optimal performance, attention to PCB layout is essential. Use short and wide traces for the IN, OUT, and GND paths to minimize parasitic inductance and resistance. The exposed metal tab of the DPAK-5 package must be soldered to a copper area on the PCB, which acts as a heatsink to dissipate thermal energy under high load conditions.

ICGOODFIND Summary

The Infineon TLE4274GSV33 is a highly reliable and robust LDO regulator, purpose-built for demanding environments. Its wide input voltage range, comprehensive protection suite, and ability to work with small ceramic capacitors make it an exceptional choice for powering 3.3V subsystems from unregulated or noisy power sources like automotive batteries. Its combination of performance, protection, and package efficiency provides a superior solution for power management challenges.

Keywords: Low-Dropout Regulator, 3.3V Output, Reverse Polarity Protection, Automotive Grade, DPAK-5 Package.