Infineon TLE42744GSV33 5V to 3V Low-Dropout Voltage Regulator: Features and Application Circuits

In the realm of power management for automotive, industrial, and consumer electronics, the need for stable, clean, and reliable voltage regulation is paramount. The Infineon TLE42744GSV33 stands out as a robust and highly integrated low-dropout (LDO) voltage regulator designed to convert a 5V input to a precise 3.3V output. This component is engineered to excel in harsh electrical environments, making it a preferred choice for a wide array of applications.

Key Features of the TLEER42744GSV33

The TLE42744GSV33 is packed with features that ensure superior performance and system protection:

Very Low Dropout Voltage: With a typical dropout of only 280 mV at a full load current of 400 mA, this LDO can maintain regulation even when the input voltage dips very close to the output level. This maximizes efficiency and is crucial for battery-powered applications or systems with fluctuating input voltages.

High Accuracy Output: The device provides a highly accurate 3.3V output voltage with a tolerance of ±2%. This precision is essential for powering sensitive digital cores, microcontrollers, and sensors that require a stable supply to function correctly.

Outstanding Load and Line Regulation: It exhibits excellent performance in maintaining a constant output despite variations in the input voltage (line regulation) or the output load current (load regulation).

Comprehensive Protection Functions: A key strength of this regulator is its built-in protection suite. It includes overcurrent protection (OCP) to safeguard the IC and the load during short circuits, overtemperature protection (OTP) that shuts down the device if the junction temperature exceeds safe limits, and reverse polarity protection up to -42V, which is vital for automotive applications where load dump and jump-start scenarios can occur.

Additional Control and Monitoring: The IC features an enable (ON/OFF) pin, allowing for external control of the regulator to save power in standby modes. It also integrates a reset generator with a programmable delay time via an external capacitor. This reset signal is invaluable for microcontroller-based systems, ensuring a controlled startup and shutdown sequence.

Automotive Qualified: Designed for the rigorous automotive environment, it is qualified according to AEC-Q100, ensuring high reliability and performance under extreme temperatures and stresses.

Typical Application Circuits

The TLE42744GSV33 is simple to implement, requiring only a few external components for most applications.

1. Basic Application Circuit:

The most straightforward implementation requires just two capacitors. An input capacitor (typically 1 µF or greater, ceramic) is placed close to the VIN pin to ensure input stability and suppress high-frequency noise. An output capacitor (typically 1 µF, ceramic) is essential for loop stability and managing transient load responses. The reset delay time is set by a single capacitor (Cq) connected to the delay pin, defining the period after the output voltage is stable before the reset signal is released.

2. Standard Application with Enable Control:

For systems requiring power sequencing or a sleep mode, the enable pin (EN) is utilized. It can be driven directly by a microcontroller's GPIO pin. Pulling this pin high (> 2.0V) turns the regulator on; pulling it low (< 0.8V) switches the output off, drastically reducing the quiescent current. This circuit is identical to the basic one but includes a control line from the MCU to the EN pin.

3. Application in a Noisy Environment:

In scenarios with significant electrical noise or input voltage transients (e.g., an automotive power rail), it is advisable to use larger capacitor values (e.g., 10 µF electrolytic or tantalum in parallel with a 100 nF ceramic) on the input. A small ferrite bead can also be added in series with the input line to form a low-pass filter, further decoupling the regulator from high-frequency noise on the input supply.

ICGOODFIND Summary

The Infineon TLE42744GSV33 is a highly robust and feature-complete low-dropout regulator that delivers exceptional performance for 3.3V power rails. Its combination of very low dropout, high accuracy, and extensive built-in protection (overcurrent, overtemperature, reverse polarity) makes it an exceptionally reliable solution. The integrated reset generator and enable control further reduce external component count and simplify system design, particularly for automotive and industrial microcontroller applications where reliability is non-negotiable.

Keywords:

Low-Dropout Regulator (LDO)

Automotive Qualified

3.3V Output

Overcurrent Protection

Reset Generator