Infineon TLE42764DVATMA1 5V Low-Dropout Voltage Regulator: Features, Applications, and Design Considerations
The Infineon TLE42764DVATMA1 is a monolithic integrated low-dropout voltage regulator designed to deliver a fixed 5V output with a maximum current of up to 450 mA. Housed in a thermally enhanced PG-TO252-5 (DPAK-5) package, this device is engineered for robustness and reliability in demanding automotive and industrial environments. Its core function is to provide a stable, clean voltage supply to sensitive microcontrollers, sensors, and other ICs, protecting them from the fluctuations and transients common in electrical systems.
Key Features
The TLE42764DVATMA1 boasts a suite of features that make it a standout choice for power management:
Low Dropout Voltage: With a typical dropout of only 320 mV at 400 mA load, it can maintain regulation even when the input voltage is very close to the 5V output, enhancing efficiency and allowing operation in low-input-voltage scenarios.
Very Low Quiescent Current: The device features an exceptionally low typical quiescent current of 18 µA in normal operation and just 3 µA in standby mode, making it ideal for battery-powered applications where every microamp counts.
High Accuracy Output Voltage: The output voltage is guaranteed to within ±2% accuracy over the entire temperature, load, and input voltage ranges, ensuring precision for connected components.
Comprehensive Protection Functions: It includes overcurrent protection (OCP), overtemperature shutdown (TSD), and reverse polarity protection, safeguarding both the regulator itself and the load circuit from damage.
Automotive Qualification: As a key differentiator, it is AEC-Q100 qualified, ensuring it meets the stringent quality and reliability standards required for automotive electronics.
Primary Applications
Due to its rugged design and protective features, the TLE42764DVATMA1 is predominantly used in the automotive sector but is equally suitable for harsh industrial controls.
Body Control Modules (BCMs): Powering window lift, seat control, and lighting units.
Infotainment and Cluster Systems: Providing a stable supply for microprocessors and display drivers.
Engine Management Systems: Supplying sensors and actuators that require a clean 5V rail.
Industrial PLCs and Sensor Nodes: Where reliability and low power consumption are critical.
Critical Design Considerations
Successful implementation requires attention to several key factors:
1. Input and Output Capacitors: Stability is ensured using a low-ESR output capacitor in the range of 10 µF to 47 µF. An input capacitor is also recommended, especially if the regulator is located far from the main power source.
2. Thermal Management: Despite the low dropout, power dissipation (P_diss = (V_in - V_out) I_load) can be significant at high load currents. The thermally enhanced package must be properly connected to a sufficient PCB copper area to act as a heatsink, preventing the internal overtemperature protection from engaging.
3. Dropout Voltage Consideration: The input voltage must always remain above the V_out + V_drop value. For a 400 mA load, the input must be greater than approximately 5.32V to maintain regulation.
4. Enable Pin (EN): The enable function allows for logic-level control of the output, facilitating power sequencing and sleep modes to minimize system quiescent current.
The Infineon TLE42764DVATMA1 is a highly robust and efficient 5V LDO regulator, distinguished by its automotive-grade reliability, ultra-low quiescent current, and integrated protection suite. It is an optimal solution for designers seeking to create resilient and power-efficient systems in challenging electrical environments.
Keywords: Low-Dropout Regulator, Automotive Grade, AEC-Q100, Low Quiescent Current, Thermal Protection
