Infineon TLE4254GSXUMA4 5V Low-Drop Voltage Regulator: Datasheet, Pinout, and Application Circuit Guide
The Infineon TLE4254GSXUMA4 is a monolithic integrated low-drop voltage regulator designed for a wide range of automotive and industrial applications. Delivering a fixed 5V output voltage at up to 250 mA of load current, this IC is engineered for robustness and reliability in harsh electrical environments. Its key characteristic is the very low dropout voltage, typically only 200 mV at maximum load, which allows it to continue regulating even when the input voltage dips very close to the output level. This makes it exceptionally efficient for battery-powered systems or scenarios with significant supply line fluctuations.
Datasheet Overview and Key Features
A thorough review of the TLE4254GSXUMA4 datasheet reveals a component built for performance and protection. Its core specifications include:
Output Current: Up to 250 mA.
Output Voltage: 5 V ±2% accuracy.
Low Dropout Voltage: Typically 200 mV (at I_OUT = 250 mA, T_j = 25°C).
Wide Input Voltage Range: From 3.0 V to 42 V, making it suitable for 24V truck and 12V passenger vehicle systems.
Comprehensive Protection Features: The IC includes short-circuit protection, overtemperature shutdown, and reverse polarity protection up to -42V, safeguarding both the regulator and the load.
Low Quiescent Current: Typically 85 µA, which is crucial for applications requiring low standby power consumption.
Enable Function: An enable pin (EN) allows for external switching of the regulator, facilitating power management strategies to reduce system quiescent current.
Pinout Configuration (PG-SOT223-4 package)
The TLE4254GSXUMA4 is housed in a compact and thermally efficient PG-SOT223-4 package.
1. Pin 1 (IN): Input Voltage Pin. This pin supplies power to the regulator. A capacitor must be connected between this pin and ground for stability.
2. Pin 2 (GND): Ground Pin.
3. Pin 3 (EN): Enable Pin. Applying a voltage above the enable threshold (typically > 2 V) turns the regulator ON. Pulling this pin below the disable threshold (typically < 0.8 V) switches the regulator into a low-power standby mode. Do not leave this pin floating.
4. Pin 4 (OUT): Regulated 5V Output Pin. A capacitor must be connected from this pin to ground to ensure stability and improve transient response.
Application Circuit Guide
A typical application circuit for the TLE4254GSXUMA4 is straightforward to implement. The basic schematic requires only a few external components:
1. Input Capacitor (C_IN): A ceramic capacitor with a value of 100 nF to 1 µF should be placed as close as possible between the IN pin and GND to suppress high-frequency noise on the input supply.
2. Output Capacitor (C_OUT): A capacitor is mandatory for loop stability. A 1 µF ceramic capacitor with low ESR (Equivalent Series Resistance) is recommended, connected between the OUT pin and GND. For applications with high transient loads, a larger capacitor (e.g., 4.7 µF) may be beneficial.
3. Enable Control: The EN pin can be directly tied to the IN pin for always-on operation. For advanced power management, it can be driven by a microcontroller GPIO pin or a logic circuit. A pull-down resistor may be used to ensure a defined OFF state if the enable source is high-impedance at startup.
This circuit provides a stable, clean, and protected 5V rail from an unregulated input source (e.g., a car battery), powering microcontrollers, sensors, and other logic circuits.
The Infineon TLE4254GSXUMA4 stands out as an exceptionally robust and reliable 5V LDO regulator. Its high input voltage tolerance and extensive suite of protection features make it an ideal, industry-proven choice for demanding automotive and industrial control systems where electrical noise and voltage transients are a constant challenge. Its simple application circuit and low dropout voltage further contribute to its widespread popularity among design engineers.
Keywords: Low-Dropout Regulator, Automotive Grade, 5V Voltage Regulator, Reverse Polarity Protection, SOT223 Package.
