L4949EDTR-E: A reliable linear voltage regulator with reset function for automotive and industrial applications

L4949EDTR-E is a linear positive voltage regulator produced by STMicroelectronics. It is mainly designed for automotive and industrial applications where stable output voltage is crucial, and a reset function is also required. This device provides an output voltage of 5V with a maximum current of 0.1A. It has several important features that make it a popular choice in many electronic projects.

Key Features of L4949EDTR-E:

1. Output Voltage:

• The output voltage is 5V ±1%.

2. Input Voltage Range:

• Can operate with an input voltage ranging from 5V to 28V, making it versatile for power supply applications.

3. Maximum Output Current:

• Capable of delivering up to 100 mA, which is sufficient for many low-power applications.

4. Low Voltage Drop:

• Features a voltage drop of less than 0.5V, allowing efficient operation even with minimal voltage differences.

5. Operating Temperature Range:

• From -40°C to +125°C, suited for harsh conditions typical in automotive and industrial applications.

6. Low Quiescent Current: 

• The device consumes very little energy, which is significant in battery-powered systems when the device is inactive.

7. Protection Features:

• Thermal Protection: Guards against overheating, ensuring a longer lifespan for the device.
• Short-Circuit Protection: Protects both the regulator and connected devices from damage.
• Power-On Reset: The device has the ability to delay the reset pulse using an external capacitor, allowing for better control during system startup.
• Surge Voltage Tolerance: Can withstand transient voltages up to 40V, which is crucial in automotive applications where voltages can change suddenly.

Applications:

• Automotive: Power supply for microprocessor circuits and monitoring systems.
• Industrial: Stabilized power source for various sensors and control devices.
• Consumer Electronics: Voltage stabilization for digital and analog circuits, such as embedded systems, control circuits, and other low-power applications.

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