Infineon TLE42744GV50ATMA1 5V Voltage Regulator: Datasheet, Pinout, and Application Circuit Design

The Infineon TLE42744GV50ATMA1 is a robust, low-dropout (LDO) voltage regulator designed to deliver a precise 5V output voltage at currents up to 450 mA. As a critical component in automotive and industrial electronics, its primary function is to provide a stable, clean voltage supply to microcontrollers, sensors, and other ICs from a higher, fluctuating input voltage, typically from a vehicle battery or a power supply rail.

This regulator is part of Infineon's renowned product family, known for its high reliability and exceptional performance under harsh conditions. It features built-in protection mechanisms such as over-current protection, short-circuit protection, and overtemperature shutdown, ensuring system safety and longevity. A key advantage is its very low current consumption in standby mode, making it ideal for applications requiring always-on functionality.

Datasheet Overview: Key Parameters

A thorough review of the datasheet reveals the device's critical specifications:

Output Voltage (Vout): 5 V ±2% accuracy

Output Current (Iout): Up to 450 mA

Input Voltage (Vin): Up to 42 V (abs. max. 45 V)

Dropout Voltage (Vdrop): Typically 400 mV at 400 mA load

Quiescent Current (IQ): Typically 40 µA in normal operation

Standby Current (ISTB): Typically 15 µA when enabled

Operating Temperature Range (Tj): -40°C to +150°C

Package: PG-TO252-5 (also known as DPAK-5)

Pinout Configuration

The device comes in a 5-pin package. Understanding the pinout is crucial for correct PCB layout:

1. IN (Pin 1): Input Voltage pin. A bypass capacitor must be placed close to this pin.

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

3. EN (Pin 3): Enable pin. A high-level signal (> 2 V) turns the regulator on; a low-level signal (< 0.8 V) puts it into low-power standby mode.

4. Q (Pin 4): Quiescent (Ground) Current pin. This pin is used for functionality diagnosis but is typically connected to GND via a resistor (RQ).

5. OUT (Pin 5): Regulated 5V Output pin. Requires output capacitors for stability.

Typical Application Circuit Design

Designing a stable power supply with the TLE42744 is straightforward. The basic application circuit requires only a few external components:

1. Input Capacitor (CIN): A 100 nF ceramic capacitor should be placed as close as possible between the IN pin and GND to suppress high-frequency noise on the input line. For automotive applications, a larger bulk capacitor (e.g., 10 µF to 47 µF) is also recommended to handle load transients and voltage spikes.

2. Output Capacitor (COUT): Stability requires a capacitor on the output. A 1 µF ceramic capacitor with low ESR (Effective Series Resistance) is the minimum requirement. For improved transient response, a larger capacitor value (e.g., 10 µF) is advisable. The capacitor must be placed close to the OUT and GND pins.

3. Quiescent Current Resistor (RQ): A resistor (typically 1 kΩ) is connected between the Q pin and GND. This resistor sets a current path for the internal diagnosis circuitry.

4. Enable Control: The EN pin can be directly tied to the IN pin for always-on operation. For power sequencing or remote control, it can be driven by a microcontroller GPIO pin or a logic circuit.

ICGOODFIND Summary

The Infineon TLE42744GV50ATMA1 is an excellent choice for demanding 5V power supply applications, particularly in the automotive sector. Its wide input voltage range, robust integrated protections, and low quiescent current make it a cornerstone for powering ECUs, infotainment systems, and body control modules. The simple application design, requiring minimal external components, allows for a highly reliable and compact PCB layout. When designing, always consult the latest official datasheet from Infineon to ensure all parameters and layout guidelines are met for optimal performance.

Keywords: Low-Dropout (LDO) Regulator, Automotive Grade, 5V Output, Application Circuit, Voltage Regulation