Infineon TLE4295GV50 Low-Dropout Voltage Regulator: Features and Application Circuits
The Infineon TLE4295GV50 is a monolithic integrated low-dropout voltage regulator designed to deliver a fixed 5.0V output with a maximum current of 150mA. It is engineered for use in automotive and industrial environments, offering high reliability and robust performance under demanding conditions. Its primary function is to provide a stable, clean, and precisely regulated voltage supply from a higher and often fluctuating input voltage, making it indispensable for powering microcontrollers, sensors, and other critical logic circuits.
Key Features
The TLE4295GV50 stands out due to its suite of protective and functional features tailored for resilience:
Very Low Current Consumption: With a very low quiescent current, it is highly efficient, making it suitable for battery-powered applications or any system where power saving is crucial.
Low Dropout Voltage: The low dropout voltage ensures regulation is maintained even when the input voltage dips to just slightly above the output level, maximizing the usable input range.
Outstanding Accuracy: The output voltage is guaranteed to within ±2% accuracy over the entire temperature and load range, which is vital for precision analog and digital circuits.
Integrated Protection Functions: The device is fortified with comprehensive protection mechanisms, including overload protection, short-circuit protection, and overtemperature protection. These features safeguard both the regulator itself and the connected load from damage.
Wide Operating Range: It accepts an input voltage from 5.5V up to 42V, with transient survival capabilities up to 45V, perfectly aligning with the harsh requirements of the 12V and 24V automotive power systems.
Enable Function: The enable pin allows for external on/off control of the regulator, facilitating power management strategies to further reduce system quiescent current.
Typical Application Circuits
The basic application circuit for the TLE4295GV50 is straightforward, requiring only a few external components for stable operation.
1. Standard Regulator Circuit:
The most common configuration involves connecting input and output capacitors. A ceramic or electrolytic capacitor (e.g., 10µF to 100µF) should be placed between the input pin (VIN) and ground (GND) to smooth input voltage transients and ensure stability. Similarly, a capacitor (e.g., 100nF to 10µF) at the output pin (VQ) is necessary to improve stability and transient response. The enable pin (EN) can be tied directly to VIN for always-on operation or connected to a microcontroller for logic-controlled shutdown.
2. Circuit with Delayed Enable:
For sequencing multiple voltage rails, a simple RC network can be added to the enable pin. Connecting a resistor from VIN to EN and a capacitor from EN to GND creates a time delay. The RC time constant determines how long it takes for the voltage on the EN pin to rise to the turn-on threshold after the main input voltage is applied, thereby delaying the output turn-on.
3. Reverse Voltage Protection:
While the IC itself has some inherent robustness, in environments with a high risk of reverse polarity (e.g., automotive jump-starting), an external protection Schottky diode can be added in series with the input supply. This diode prevents reverse current from flowing into the regulator, offering an extra layer of security.
In summary, the Infineon TLE4295GV50 is a highly robust and precise low-dropout voltage regulator. Its excellent accuracy, minimal power consumption, and extensive suite of integrated protection features make it an ideal choice for automotive and industrial control systems where reliability is non-negotiable. Its simple application design, requiring minimal external components, allows for quick and cost-effective implementation into a wide array of electronic designs.
Keywords: Low-Dropout (LDO) Regulator, Automotive Grade, Overcurrent Protection, Voltage Regulation, Infineon
