Infineon TLE42764GV 5V Low-Dropout Voltage Regulator: Features and Application Circuits
In the realm of power management, the quest for stable, clean, and efficient voltage regulation is paramount. The Infineon TLE42764GV stands out as a robust 5V low-dropout (LDO) voltage regulator engineered to meet the stringent demands of modern automotive and industrial applications. This monolithic integrated circuit is designed to deliver a fixed, precise 5V output from a higher input voltage, ensuring reliable performance for microcontrollers, sensors, and other critical logic circuits.
Key Features of the TLE42764GV
The TLE42764GV integrates a suite of features that make it a superior choice for harsh electrical environments. Its very low dropout voltage is a critical advantage, typically as low as 200 mV at a 400 mA load. This allows the regulator to continue providing a stable 5V output even when the input voltage dips very close to the output level, maximizing efficiency and extending operational range in battery-sensitive applications.
A hallmark of this device is its exceptional accuracy. The output voltage is guaranteed to within ±2% under all operating conditions, including line, load, and temperature variations. This precision is vital for powering sensitive analog and digital components.
Furthermore, the IC boasts comprehensive built-in protection. It features overload protection, short-circuit protection, and overtemperature protection, safeguarding both the regulator itself and the downstream circuitry from damage. The reverse polarity protection is particularly crucial for automotive scenarios where miswiring is a potential risk.
The TLE42764GV also includes an enable pin, allowing for external on/off control of the regulator. This facilitates power sequencing and helps reduce overall system power consumption in standby modes. The device's very low quiescent current in standby mode further enhances its efficiency credentials. Additionally, the integrated reset circuit with a programmable delay provides a defined reset signal to the microcontroller during power-up and power-down phases or in the event of a voltage drop, ensuring a controlled system start-up.
Application Circuits
The versatility of the TLE42764GV is demonstrated through its application in various circuit configurations.
1. Standard Application Circuit:
The most straightforward implementation requires only a few external components. The input pin (VIN) is decoupled with a ceramic capacitor (typically 100 nF to 1 µF) placed close to the IC to handle high-frequency noise. A larger electrolytic or tantalum capacitor (e.g., 10 µF to 47 µF) may be needed on the input if the supply line is long. Similarly, the output pin (VOUT) requires a minimum capacitor for stability. A 1 µF ceramic capacitor is often sufficient, but the datasheet specification must be followed. The enable pin (EN) can be tied directly to VIN for always-on operation or connected to a microcontroller's GPIO for manual control.
2. Circuit with Reset Functionality:
To utilize the reset feature, two external resistors are added to program the threshold voltage and delay time of the reset signal. A resistor divider network (R1, R2) is connected to the adjust pin (ADJ) to set the precise voltage level at which the reset is triggered. A capacitor (CQ) connected to the delay pin (CD) sets the time delay for the reset signal after the output voltage becomes stable. This is essential for ensuring the microprocessor starts only after the supply voltage is fully valid.
3. High-Current and Low-Noise Considerations:
For applications requiring higher current or exhibiting exceptionally noisy input supplies, the input and output filtering can be enhanced. Adding a larger bulk capacitor on the input, along with a small ferrite bead, can create a low-pass filter to suppress conducted EMI. Ensuring a adequate PCB layout with short, wide traces for high-current paths and a solid ground plane is critical for optimal performance and thermal management.
The Infineon TLE42764GV is a highly reliable and feature-rich 5V LDO regulator. Its combination of low dropout voltage, high accuracy, and extensive protection features (including reverse polarity and reset generation) makes it an exemplary solution for automotive body control modules, industrial control systems, and any application demanding a robust and precise power supply.
Keywords:
Low-Dropout (LDO) Regulator, Reverse Polarity Protection, Reset Circuit, Automotive Grade, Voltage Regulation
