Infineon TLE4275GV33 5V to 3V Low-Dropout Voltage Regulator: Datasheet, Pinout, and Application Circuit Guide

The Infineon TLE4275GV33 is a monolithic integrated low-dropout voltage regulator designed to deliver a fixed 5V to 3.3V conversion with high accuracy and very low current consumption. As a quintessential power management IC, it is engineered to supply a constant voltage to microcontrollers, sensors, and other digital logic in a wide range of automotive and industrial applications.

This article provides a detailed overview of its key specifications, pin configuration, and a typical application circuit to ensure a robust and reliable design.

1. Key Features and Datasheet Highlights

The TLE4275GV33 is part of Infineon's extensive LDO portfolio, renowned for its robustness and quality. Key parameters from the datasheet include:

Output Voltage: 3.3 V ±2% accuracy over the entire temperature and load range.

Maximum Input Voltage: Up to 40 V, making it exceptionally resilient to voltage spikes common in automotive environments.

Low Dropout Voltage: Typically 300 mV at a full load current of 450 mA. This low dropout allows it to continue regulating even when the input voltage dips close to the output level, which is crucial for battery-powered systems.

Output Current: Up to 450 mA.

Very Low Quiescent Current: Typically 40 µA in operation and only 8 µA in standby mode, which is critical for battery-life-sensitive applications.

Protection Features: The IC is equipped with comprehensive protection mechanisms, including overcurrent protection, overtemperature shutdown, and reverse polarity protection.

Operating Temperature Range: -40 °C to 150 °C (Junction Temperature), ensuring performance under the most demanding conditions.

2. Pinout and Package

The TLE4275GV33 is commonly available in a PG-TO252-5 (DPAK-5) package. The pinout is as follows:

Pin 1 (IN): Input Voltage Pin. A capacitor must be connected between this pin and ground for stability.

Pin 2 (GND): Ground Pin.

Pin 3 (EN): Enable Pin. A high-level signal (> 2 V) turns the regulator ON. This pin can be pulled to ground to switch the IC into a low-power standby mode.

Pin 4 (nRESET): Reset Output (Open Drain). This pin provides a reset signal for a microcontroller. It becomes active (low) if the output voltage falls below a certain threshold or if the enable pin is low.

Pin 5 (OUT): Output Voltage Pin (3.3V). A capacitor must be connected between this pin and ground for stability.

3. Typical Application Circuit Guide

A standard application circuit for the TLE4275GV33 is straightforward to implement. The schematic below shows the necessary external components for stable operation.