Infineon TLE4253EXUMA2 Low-Dropout Voltage Regulator: Datasheet, Pinout, and Application Circuit Guide
The Infineon TLE4253EXUMA2 is a monolithic integrated low-dropout voltage regulator designed to deliver a fixed 5V output with a maximum current of 150mA. Housed in a space-saving SOT23-5 package, it is an ideal solution for powering microcontrollers, sensors, and other logic circuits in automotive and industrial applications where robust performance and reliability are paramount.
Key Features from the Datasheet
The TLE4253EXUMA2 is engineered for exceptional performance. Its very low current consumption of typically 65 µA makes it perfect for battery-powered or always-on systems. A key highlight is its extremely low dropout voltage, typically 60 mV at I_OUT = 50 mA, which maximizes efficiency and allows operation with input voltages very close to the 5V output. The device is fully protected against overload, short-circuit, and overtemperature conditions, ensuring safe operation under fault scenarios. Furthermore, it boasts high immunity to reverse polarity and load dump transients, a critical requirement in the harsh electrical environments of automotive electronics.
Pinout Configuration (SOT23-5)
Understanding the pinout is crucial for proper circuit design:
1. IN (Pin 1): Input voltage pin. A capacitor must be connected between this pin and ground for stability.
2. GND (Pin 2): Ground pin.
3. EN (Pin 3): Enable pin. A high-level signal (> 2.0V) activates the regulator; a low-level signal (< 0.8V) puts it into a low-quiescent current standby mode.
4. NC (Pin 4): No internal connection. This pin can be left floating or connected to GND.
5. OUT (Pin 5): Regulated 5V output pin. Requires a capacitor to ground for stability.
Application Circuit Guide
A typical application circuit for the TLE4253EXUMA2 is straightforward. The input voltage (V_IN), which can range from 5.5V to 42V, is connected to pin 1 (IN) through a series resistor if necessary for additional protection. A ceramic capacitor (C_IN) of 100 nF should be placed as close as possible to the IN and GND pins to suppress high-frequency noise. Similarly, a ceramic output capacitor (C_OUT) of 100 nF is required between pin 5 (OUT) and GND to ensure stability. For the enable function, pin 3 (EN) can be driven directly by a microcontroller GPIO pin or tied to the IN pin for always-on operation.
The Infineon TLE4253EXUMA2 stands out as a highly robust and efficient low-dropout regulator. Its combination of low quiescent current, minimal dropout voltage, and comprehensive built-in protection features makes it an exceptional choice for designing reliable power supplies, especially in demanding automotive and industrial control systems.
Keywords: Low-Dropout Regulator, Automotive Grade, SOT23-5, Short-Circuit Protection, Overtemperature Protection.
