Infineon TLE4276DV50 5V Voltage Regulator: Features, Applications, and Design Considerations

The Infineon TLE4276DV50 is a robust, monolithic integrated low-drop voltage regulator designed to deliver a fixed 5V output with a maximum current of 450 mA. As a critical component in power management systems, its combination of performance, protection features, and reliability makes it a preferred choice for automotive, industrial, and consumer applications.

Key Features

The TLE4276DV50 stands out with its impressive set of features engineered for demanding environments. Its low dropout voltage of typically 450 mV at full load ensures efficient operation even when the input voltage is close to the output level, minimizing power dissipation. The device incorporates a comprehensive suite of internal protection mechanisms, including current limitation, overtemperature shutdown, and reverse polarity protection. This makes it exceptionally resilient against fault conditions that could damage the regulator or the downstream circuitry. Furthermore, it features very low quiescent current in both operating and standby modes, which is crucial for battery-powered applications aiming to extend operational life. Additional functionalities such as a reset output with a programmable delay and an enable input provide enhanced system control and monitoring capabilities.

Primary Applications

The robustness of the TLE4276DV50 makes it particularly suitable for the harsh electrical environment of automotive electronics. It is commonly used to power microcontrollers, sensors, and other critical logic circuits in engine control units (ECUs), body control modules, and infotainment systems. Its ability to withstand load-dump transients and its reverse polarity protection are invaluable in the automotive context. Beyond automotive, it finds extensive use in industrial control systems and consumer electronics where a stable and clean 5V supply is required for processors, ASICs, and various digital logic families. Any application demanding a stable voltage rail from an unregulated input, such as a car battery or a wall adapter, can benefit from this regulator.

Critical Design Considerations

Successful implementation of the TLE4276DV50 requires careful attention to several design aspects. Input and output capacitor selection is paramount for stability and noise suppression. While the regulator is stable with a low-ESR output capacitor, a minimum value, typically 2.2 µF, is required and should be placed as close as possible to the IC's pins. For the input, a capacitor is necessary to smooth incoming supply ripple and handle transient currents. Thermal management is another crucial factor. The power dissipation (P_diss = (V_in - V_out) I_load) must be calculated to ensure the junction temperature does not exceed its maximum limit. For higher load currents or large input-output differentials, a heatsink may be necessary. Designers must also ensure the input voltage remains within the specified absolute maximum range (up to 45V) and that the enable and reset circuits are correctly configured for the specific application's timing requirements.

ICGOODFIND Summary

The Infineon TLE4276DV50 is a highly reliable, feature-rich 5V linear voltage regulator. Its exceptional protection features, low dropout voltage, and low quiescent current make it an ideal power solution for automotive and industrial systems that prioritize stability and durability under challenging conditions.

Keywords: Low Dropout Voltage Regulator, Automotive Electronics, Reverse Polarity Protection, Thermal Management, Power Management IC