Infineon TLE4276G 5V Low-Dropout Voltage Regulator: Features and Application Circuits
The Infineon TLE4276G is a robust and highly reliable 5V low-dropout (LDO) voltage regulator designed for automotive and industrial applications. It delivers a fixed output voltage of 5V with a maximum output current of 450 mA, making it an ideal choice for powering microcontrollers, sensors, and other digital logic circuits in demanding environments.
Key Features of the TLEER4276G
One of the standout attributes of this LDO is its extremely low dropout voltage. With a typical dropout of only 200 mV at 150 mA load, it can maintain regulation even when the input voltage is very close to the output level, enhancing efficiency and allowing operation in low-input-voltage scenarios.
The device incorporates comprehensive protection features essential for harsh electrical environments. These include reverse polarity protection, which safeguards the IC if the battery connections are accidentally reversed. It also features overcurrent protection (short-circuit protection) and overtemperature protection, which shut down the device to prevent damage under fault conditions, ensuring maximum system reliability.
Furthermore, the TLE4276G boasts very low quiescent current in both operating and standby modes, which is critical for automotive applications where low power consumption is paramount, especially in always-on systems or during ignition-off periods. An integrated reset circuit with a programmable delay time provides a controlled signal to a microcontroller upon power-up and power-down, ensuring a safe and orderly system start-up and shutdown.
Typical Application Circuits
The basic application circuit for the TLE4276G is straightforward, requiring only a few external components for operation, which simplifies design and reduces the overall bill of materials.
1. Standard Regulation Circuit:
The most common configuration involves using input and output capacitors for stability. A capacitor (e.g., 100 nF) is placed close to the input pin (VIN) to ground to filter high-frequency noise. A larger output capacitor (typically 10 µF to 47 µF) is connected from the output pin (VOUT) to ground to ensure stability and improve transient response. The reset delay time is set by a single external capacitor (CQ) connected to the delay pin (CD), allowing designers to tailor the reset timing to the specific needs of the microcontroller.
2. Circuit with Enable Function:
The TLE4276G includes an enable pin (EN). Pulling this pin high (above 2 V) activates the regulator, while pulling it low (below 0.8 V) places the device in a low-power standby mode, drastically reducing its quiescent current. This feature allows an external microcontroller or logic circuit to control the power state of the regulator, enabling sophisticated power management strategies.
3. Automotive Power Supply:
In an automotive context, the regulator is placed directly after the battery supply. Its inherent robustness handles load dump, jump-start, and cold-crank conditions. The reverse polarity protection eliminates the need for an external series diode, saving power and cost. The reset output is directly connected to the reset pin of an ECU's main microcontroller, guaranteeing proper initialization.
ICGOODFIND Summary
The Infineon TLE4276G is a premier 5V LDO regulator that excels in harsh automotive and industrial environments. Its combination of low dropout voltage, comprehensive protection mechanisms, integrated reset generator, and low quiescent current makes it an exceptionally robust and versatile solution for powering critical electronic control units.
Keywords: Low-Dropout Voltage Regulator, Automotive Grade, Reverse Polarity Protection, Quiescent Current, Reset Circuit
