Infineon TLE42744GSV33HTMA1 3V Low-Dropout Voltage Regulator: Datasheet, Pinout, and Application Circuit Design
The Infineon TLE42744GSV33HTMA1 is a robust, monolithic integrated low-dropout voltage regulator designed to deliver a fixed 3.3V output voltage at a maximum current of up to 400 mA. Engineered for the demanding environments of automotive and industrial applications, this IC combines high accuracy, excellent load transient response, and comprehensive protection features.
Key Datasheet Specifications and Features
A deep dive into the datasheet reveals the capabilities that make this LDO a preferred choice:
Output Voltage: Fixed at 3.3 V ±2% accuracy over the entire temperature and input voltage range.
Output Current: Up to 400 mA.
Low Dropout Voltage: Typically 200 mV at 150 mA load, ensuring efficient operation even when the input voltage is very close to the output level.
Wide Input Voltage Range: From 4 V to 42 V, making it exceptionally suited for 12V and 24V automotive systems that must handle load dump and transients.
Very Low Quiescent Current: Typically 40 µA in operational mode, which is crucial for reducing power consumption in always-on systems.
Comprehensive Protection: The device includes overcurrent protection, short-circuit protection, and overtemperature shutdown. A critical feature is the reverse polarity protection of up to -42 V, safeguarding the circuit during incorrect battery connection.
Enable Function: An active-high enable pin (EN) allows for external switching of the regulator, facilitating power management and sleep modes.
Operating Temperature Range: -40 °C to 150 °C (Tj), ensuring reliable performance under extreme conditions.
Pinout Configuration
The TLE42744GSV33HTMA1 is available in a PG-TO252-5-11 (DPAK) package with five pins:
1. IN: Input voltage pin. A capacitor must be placed close to this pin for stability.
2. GND: Ground pin.
3. EN: Enable pin. Driving this pin high (> 2.0 V) turns the regulator ON; pulling it low (< 0.8 V) switches it into a low-power standby mode.
4. Q: Quiescent current pin. This pin is typically connected to GND via a resistor for current monitoring. It can be left open or connected directly to GND if not used.
5. OUT: Regulated 3.3V output pin. Requires a capacitor to ground for stability.
Typical Application Circuit Design
Designing a stable and reliable power supply with the TLE42744GSV33HTMA1 is straightforward. The typical application circuit requires only a few external components:
1. Input Capacitor (C_IN): A low-ESR ceramic capacitor (e.g., 100 nF to 1 µF) should be placed as close as possible between the IN and GND pins to suppress high-frequency noise and improve transient response. For harsh automotive environments, a larger bulk capacitor (e.g., 10 µF to 47 µF) may be added further on the input rail to handle slow transients.
2. Output Capacitor (C_OUT): Stability requires a capacitor on the OUT pin. The datasheet recommends a minimum of 1 µF ceramic capacitor, but a value of 2.2 µF to 10 µF is commonly used to ensure stability and improve load transient performance. It must be placed close to the regulator.
3. Enable Control: The EN pin should not be left floating. It can be connected directly to IN if always-on operation is desired. For remote control, it can be driven by a microcontroller GPIO pin or a logic circuit. A pull-down resistor (e.g., 100 kΩ) can be added to ensure a defined low state if the enable source is high-impedance.
This simple design, combined with the IC's built-in protections, creates a highly resilient power supply solution for microcontrollers, sensors, and other critical loads in vehicles and industrial machinery.
The Infineon TLE42744GSV33HTMA1 stands out as an exceptionally robust and reliable LDO regulator. Its wide input voltage range and extensive suite of built-in protection features make it an ideal, simple-to-implement solution for stabilizing power rails in electrically noisy environments like automotive electronics. Its low dropout voltage and quiescent current further enhance its efficiency for modern, power-sensitive applications.
Keywords:
Low-Dropout Voltage Regulator
Automotive Grade
3.3V Output
Wide Input Voltage
Reverse Polarity Protection
