Infineon TLE4276DV 5V Low-Dropout Voltage Regulator: Datasheet, Pinout, and Application Circuit Guide
In the realm of power management for automotive and industrial electronics, the need for robust, reliable, and precise voltage regulation is paramount. The Infineon TLE4276DV stands out as a quintessential component in this space, a 5V low-dropout (LDO) voltage regulator engineered to deliver exceptional performance in harsh environments. This guide delves into its key specifications, pinout configuration, and a typical application circuit to facilitate your design process.
Datasheet Overview and Key Features
The TLE4276DV is a monolithic integrated fixed-voltage regulator designed for a wide input range of up to 45V. Its most critical parameter, the low dropout voltage, is typically 350 mV at a full load current of 400 mA. This means it can continue to provide a stable 5V output even when the input voltage dips as low as 5.35V, making it exceptionally resilient against input voltage sags, a common occurrence in automotive applications.
Beyond its core regulation function, the TLE4276DV is packed with protective features that underscore its robustness and reliability:
Overload and Short-Circuit Protection: The IC is internally protected against any current overload, including a complete short-circuit on the output.
Overtemperature Protection: The junction temperature is monitored, and the output is shut down if the maximum safe operating temperature (150°C typical) is exceeded.
Reverse Polarity Protection: It can withstand an input voltage reversal of up to -45V for one minute, a crucial feature for automotive miswiring scenarios.
Low Quiescent Current: In standby mode, its typical quiescent current is a mere 65 µA, which is vital for reducing power consumption in always-on systems.
Pinout Configuration
The TLE4276DV is available in a standard PG-DSO-5 (SOT-223) package. Its pinout is straightforward:
Pin 1 (IN): This is the input pin. A input capacitor, typically 100 nF, should be placed as close as possible between this pin and ground to improve stability and transient response.
Pin 2 (GND): The ground reference pin for the regulator.
Pin 3 (Q): This is the quality and status output pin. It acts as an open-collector output that pulls low if the output voltage is approximately 0.7V below its nominal value, indicating an error condition (e.g., dropout, short-circuit, overtemperature).
Pin 4 (NC): Not connected internally.
Pin 5 (OUT): The regulated 5V output. A larger output capacitor (minimum 2.2 µF, typically 10 µF) is required between this pin and ground to ensure stability.
Typical Application Circuit
A basic application circuit for the TLE4276DV is simple to implement, yet highly effective.
1. Input Decoupling: Connect a 100 nF ceramic capacitor directly from the input pin (IN) to ground (GND). This suppresses high-frequency noise on the input line.
2. Output Stabilization: Connect a 10 µF tantalum or aluminum electrolytic capacitor with low ESR (Equivalent Series Resistance) from the output pin (OUT) to ground. This capacitor is critical for loop stability and handling load transients.
3. Status Monitoring: The Q pin can be left floating if not used. To implement a fault warning, connect a pull-up resistor (e.g., 10 kΩ) from this pin to a logic-level voltage (e.g., 5V or 3.3V). A microcontroller can then monitor this line; a low signal indicates a fault.
4. Thermal Management: Although the package has good thermal properties, for continuous full-load operation, consider the power dissipation (P_diss = (V_in - V_out) I_out). Ensure the junction temperature remains within limits, potentially requiring a small heatsink or adequate copper pour on the PCB.
The Infineon TLE4276DV is an industry workhorse for 5V power regulation, particularly in demanding automotive and industrial control systems. Its exceptional combination of high input voltage tolerance, comprehensive protection features, and low dropout performance makes it a top-tier choice for designers who prioritize system durability and reliability above all else.
Keywords:
Low-Dropout (LDO) Regulator
Automotive Grade
Voltage Regulation
Short-Circuit Protection
TLE4276DV
