Texas Instruments

LM3940IS-3.3

LM3940IS-3.3 Description

The LM3940IS-3.3 is a high-performance linear voltage regulator designed by Texas Instruments, offering a fixed output voltage of 3.3V and capable of delivering up to 1A of output current. This regulator is housed in a surface-mount DDPAK/TO263-3 package, making it suitable for compact and high-density PCB designs. The LM3940IS-3.3 is designed to operate with an input voltage range up to 7.5V, ensuring reliable performance across a variety of power supply scenarios. With a maximum dropout voltage of 0.2V at 100mA, this regulator ensures efficient power conversion even under low input-to-output voltage differentials.

LM3940IS-3.3 Features

• Fixed Output Voltage: The LM3940IS-3.3 provides a stable 3.3V output, ideal for powering a wide range of digital and analog circuits.
• High Output Current: Capable of delivering up to 1A of output current, this regulator can support demanding applications requiring significant power.
• Low Dropout Voltage: With a maximum dropout voltage of 0.2V at 100mA, the LM3940IS-3.3 maintains high efficiency even when the input voltage is close to the output voltage.
• Protection Features: Integrated over-temperature and short-circuit protection ensure robustness and reliability, safeguarding the regulator and connected circuits from damage.
• Compliance and Packaging: The LM3940IS-3.3 is REACH unaffected and RoHS3 compliant, making it suitable for environmentally conscious designs. It is available in a tube package, facilitating easy handling and assembly.
• Moisture Sensitivity Level: With an MSL rating of 3 (168 hours), the regulator is well-suited for manufacturing processes that require moisture protection.

LM3940IS-3.3 Applications

The LM3940IS-3.3 is versatile and can be used in a variety of applications where a stable 3.3V supply is required. Some specific use cases include:

• Embedded Systems: Ideal for powering microcontrollers, sensors, and other low-voltage components in embedded systems.
• Communication Equipment: Suitable for providing stable power to communication modules and interfaces.
• Consumer Electronics: Can be used in devices such as smartphones, tablets, and IoT devices where compact and efficient power regulation is crucial.
• Industrial Control Systems: Provides reliable power to control units and sensors in industrial environments.
• Automotive Applications: Suitable for powering electronic control units (ECUs) and other automotive electronics that require a stable 3.3V supply.

Conclusion of LM3940IS-3.3

The LM3940IS-3.3 from Texas Instruments is a robust and efficient linear voltage regulator, offering a fixed 3.3V output with a maximum output current of 1A. Its low dropout voltage and integrated protection features make it a reliable choice for a wide range of applications. The surface-mount package and compliance with environmental standards further enhance its suitability for modern electronic designs. Whether used in embedded systems, consumer electronics, or industrial control systems, the LM3940IS-3.3 ensures stable and efficient power regulation, making it a valuable component in any design requiring a 3.3V supply.