Infineon TLE4291EXUMA2: A Comprehensive Technical Overview
The Infineon TLE4291EXUMA2 is a monolithic integrated low-drop voltage regulator designed to deliver a fixed 5V output with a maximum current of 250 mA. Engineered for the demanding environments of automotive electronics, this IC provides a robust and reliable power supply solution for microcontrollers, sensors, and other critical loads.
Core Architecture and Functionality
At its heart, the TLE4291EXUMA2 is a low-dropout (LDO) linear regulator. Its architecture includes a voltage reference, an error amplifier, a feedback network, and a series pass transistor. The device is designed to maintain a stable 5V output even when the input voltage dips to just 6V, thanks to its low dropout voltage of typically 300 mV at full load. This feature is crucial for automotive applications where the battery voltage can experience significant sag during engine cranking.
A key aspect of its design is exceptional stability, achieved without the need for an external compensation capacitor, though a small ceramic output capacitor is required for optimal performance. The regulator also integrates essential protection features, including short-circuit protection, current limitation, and overtemperature shutdown. These safeguards ensure the device and the connected load are protected under fault conditions, enhancing system reliability.
Key Features and Specifications
Output Voltage: Fixed, precise 5 V (±2% accuracy)
Output Current: Up to 250 mA
Dropout Voltage: Typically 300 mV at I_OUT = 250 mA
Low Quiescent Current: Typically 50 µA in operational mode, reducing to just 15 µA in standby mode when the enable pin is set low. This is critical for minimizing battery drain in always-on systems.
Wide Input Voltage Range: From 5.5 V to 42 V, with the ability to withstand transient voltages up to 45 V.
Enable Function: Allows for external switching of the regulator, facilitating power management strategies.
Reset Function: An integrated power-on reset (POR) circuit with a programmable delay (via an external capacitor) monitors the output voltage. It provides a reset signal to a microcontroller, ensuring safe start-up and shutdown sequences.
Package: Housed in a PG-DSO-8-47 (Exposed Pad) package, which offers excellent thermal performance, allowing heat to be efficiently dissipated into the PCB.
Target Applications
The TLE4291EXUMA2 is explicitly designed for automotive electronic systems. Its ruggedness and qualification make it ideal for use in:
Body control modules (BCMs)
Instrument clusters
Engine management systems
Sensor power supplies
Infotainment systems
The Infineon TLE4291EXUMA2 stands out as a highly integrated and resilient power management solution. Its combination of low dropout voltage, ultra-low quiescent current, and comprehensive protection features makes it an exceptional choice for automotive designers. The inclusion of a monitoring reset function further consolidates its value, providing a complete and compact power supply solution that ensures system stability and safety under the harsh conditions of an automotive environment.
Keywords: Low-Dropout Regulator (LDO), Automotive Grade, Quiescent Current, Power-on Reset (POR), Thermal Shutdown.
