Infineon TLE42764GV50 5V Voltage Regulator: Features, Application Circuit, and Datasheet Explanation
The Infineon TLE42764GV50 is a robust, low-dropout (LDO) voltage regulator designed to deliver a precise 5V output voltage at a maximum current of up to 450 mA. Housed in a PG-TO263-5 package, this IC is engineered for demanding automotive and industrial environments, offering high reliability and protection features that make it a cornerstone for power management in electronic systems.
Key Features and Specifications
The TLE42764GV50 stands out with its comprehensive set of features tailored for stability and safety. Its very low current consumption in standby mode (typ. 15 µA) makes it ideal for battery-powered applications. A critical feature is its extremely low dropout voltage—typically only 200 mV at 150 mA load—which allows it to continue regulating even when the input voltage dips close to the output level, maximizing efficiency.
Its integrated protection mechanisms are extensive:
Overcurrent Protection: Safely limits the output current during a short circuit.
Overtemperature Protection: Shuts down the regulator if the junction temperature exceeds safe limits, preventing thermal damage.
Reverse Polarity Protection: Withstands input voltages as low as -42V, a crucial feature for automotive applications where jump-starting or incorrect battery connection can occur.
Overvoltage Protection (Load Dump): Can endure transient input voltages up to 45V, protecting the IC and the load from voltage spikes common in automotive environments.
Furthermore, the device includes an enable input (EN) to switch the regulator on and off, facilitating power management sequences and reducing power consumption when the system is idle. The reset output with a programmable delay provides a defined signal to a microcontroller during power-up, power-down, or in case of an output voltage drop, ensuring a safe and controlled system state.
Application Circuit
A typical application circuit for the TLE42764GV50 is straightforward, requiring only a few external components for stable operation.
1. Input Capacitor (C_IN): A ceramic capacitor (e.g., 100 nF to 1 µF) should be placed as close as possible to the VIN and GND pins to suppress high-frequency noise on the input supply.
2. Output Capacitor (C_Q): A low-ESR output capacitor is essential for stability. The datasheet recommends a minimum of 4.7 µF ceramic or tantalum capacitor. A larger value (e.g., 10 µF) is often used to improve transient response.
3. Reset Delay Capacitor (C_DEL): This capacitor, connected between the CDEL pin and GND, sets the time delay for the reset signal. The delay time `t_D` is calculated by the formula `t_D [ms] ≈ 0.7 C_DEL [nF]`. For example, a 100 nF capacitor will provide approximately a 70 ms delay.
4. Enable Control: The EN pin can be tied directly to VIN for always-on operation or connected to a microcontroller's GPIO for digital control.
The circuit is designed to be simple yet highly effective, providing a clean, stable 5V rail from an unregulated input source ranging from approximately 5.5V to 40V.
Datasheet Explanation
Navigating the Infineon datasheet is key to a successful design. Key sections include:
Absolute Maximum Ratings: Defines the limits (e.g., input voltage, temperature) beyond which damage to the device may occur. Never exceed these values.
Electrical Characteristics: Provides detailed tables with min, typ, and max values for parameters like output voltage accuracy, dropout voltage, quiescent current, and load regulation. This is the core data for ensuring the IC meets your system's requirements.
Typical Characteristics: Graphs showing performance over temperature and load current, such as dropout voltage, quiescent current, and output voltage ripple rejection.
Application Information: Offers crucial guidance on PCB layout (e.g., using a large GND plane for heat dissipation), component selection, and calculation formulas for features like the reset delay.
Block Diagram: Illustrates the internal architecture, including the reference voltage, error amplifier, pass transistor, and the protection and monitoring circuits.
The Infineon TLE42764GV50 is a premier choice for designers seeking a high-reliability, feature-rich 5V LDO regulator. Its exceptional robustness against electrical transients, comprehensive protection suite, and low dropout performance make it exceptionally well-suited for automotive electronics, industrial control systems, and any application requiring a stable voltage rail in a harsh electrical environment.
Keywords:
Voltage Regulator
Low-Dropout (LDO)
Automotive
Overvoltage Protection
Reset Output
