Infineon TLE42754G 5V Low-Drop Voltage Regulator: Features and Application Circuit Design
The Infineon TLE42754G is a monolithic integrated low-drop voltage regulator designed to deliver a fixed 5V output with a maximum current of 450 mA. It is engineered for a wide range of automotive and industrial applications where stable voltage regulation, robustness, and reliability are paramount. Its ability to operate with a very low dropout voltage makes it particularly suitable for scenarios where the input voltage is only slightly higher than the regulated output.
Key Features of the TLE42754G
The standout characteristics of this LDO regulator are its very low dropout voltage, typically 200 mV at 150 mA load, and its extremely low quiescent current in both operational and standby modes. It incorporates a wide array of built-in protection features, including overload protection, short-circuit protection, and overtemperature protection, ensuring device longevity under fault conditions. Furthermore, it boasts excellent line and load regulation, coupled with high ripple rejection, making it immune to disturbances from the input supply. An enable input pin allows for external control, putting the device into a low-power standby mode and reducing quiescent current to a minimal value, which is critical for battery-powered systems.
Typical Application Circuit Design
A standard application circuit for the TLE42754G is straightforward to implement. The core design requires only a few external components, as shown in the basic configuration below:
1. Input Capacitor (C_IN): A ceramic capacitor, typically in the range of 100 nF to 470 nF, should be placed as close as possible to the input pin (VIN) and ground. This capacitor is crucial for ensuring stability and suppressing high-frequency noise on the input line.
2. Output Capacitor (C_OUT): A minimum output capacitor of 1 µF is required for stability. A ceramic capacitor between 1 µF and 10 µF, placed near the output pin (VOUT) and ground, is recommended. This capacitor determines the regulator's stability and dynamic response to load changes.
3. Enable Control (EN): The enable pin can be tied directly to VIN for always-on operation. Alternatively, it can be driven by a microcontroller or a logic signal to switch the regulator on and off, facilitating power management.
4. Additional Protection (Optional): For applications exposed to harsh electrical environments, such as automotive loads, additional protection components like a transient voltage suppression (TVS) diode at the input and a small series resistor can be added to safeguard against voltage spikes and reverse voltage events.
The resulting circuit provides a clean, stable, and well-regulated 5V supply from an unregulated input voltage ranging from 5.5V to 42V.
The Infineon TLE42754G stands out as a robust and highly reliable solution for 5V power regulation. Its combination of low dropout performance, comprehensive protection suite, and minimal external component count makes it an superior choice for designers seeking to create efficient and resilient power supplies for demanding automotive and industrial electronic control units (ECUs).
Keywords:
Low-Dropout Regulator
Automotive Grade
Voltage Regulation
Application Circuit
Power Management
