Texas Instruments

LM2931S-5.0

LM2931S-5.0 Description

The LM2931S-5.0 is a fixed-output linear voltage regulator designed by Texas Instruments, offering a regulated 5V output voltage with a maximum output current of 100mA. This regulator is housed in a surface-mount package, specifically the DDPAK/TO263 format, making it suitable for compact and high-density PCB designs. The LM2931S-5.0 is designed to operate with an input voltage range up to 26V, ensuring compatibility with a wide range of power sources.

Key technical specifications include a low dropout voltage of 0.3V at 100mA, which allows the regulator to maintain regulation even when the input voltage is close to the output voltage. This feature is particularly beneficial in battery-powered applications where the input voltage can drop significantly. The regulator also boasts a quiescent current of just 1mA, contributing to high efficiency and extended battery life in portable devices.

LM2931S-5.0 Features

• Fixed Output Voltage: The LM2931S-5.0 provides a stable 5V output, making it ideal for applications requiring a consistent power supply.
• Low Dropout Voltage: With a maximum dropout voltage of 0.3V at 100mA, this regulator can maintain regulation even at low input-to-output voltage differentials, enhancing its efficiency and suitability for battery-operated devices.
• High Input Voltage Range: Capable of handling input voltages up to 26V, the LM2931S-5.0 offers flexibility and robustness in various power supply configurations.
• Protection Features: The regulator includes over-temperature, reverse polarity, and short-circuit protection, ensuring reliable operation and safeguarding against common failure modes.
• Low Quiescent Current: A quiescent current of only 1mA minimizes power consumption, making the LM2931S-5.0 suitable for low-power applications.
• High PSRR: With a power supply rejection ratio of 55dB at 120Hz, the regulator effectively filters out noise from the input power supply, ensuring clean output voltage.
• Surface-Mount Package: The DDPAK/TO263 package type allows for easy integration into modern PCB designs, facilitating high-density layouts and automated assembly processes.

LM2931S-5.0 Applications

The LM2931S-5.0 is well-suited for a variety of applications where a stable 5V supply is required. Its low dropout voltage and high input voltage range make it particularly useful in battery-powered devices, such as portable electronics, handheld instruments, and wireless communication devices. The regulator's protection features and low quiescent current also make it ideal for automotive applications, where reliability and efficiency are paramount.

Other potential applications include:

• Consumer Electronics: Powering microcontrollers, sensors, and other low-power peripherals in devices like smartphones, tablets, and smartwatches.
• Industrial Equipment: Providing stable power to control systems, PLCs, and other industrial electronics that require a reliable 5V supply.
• Medical Devices: Ensuring consistent power delivery in portable medical equipment, such as glucose meters and portable ECG devices.
• Automotive Systems: Suitable for in-car electronics, including infotainment systems, GPS units, and various control modules.

Conclusion of LM2931S-5.0

The LM2931S-5.0 from Texas Instruments is a versatile and reliable fixed-output linear voltage regulator, offering a range of features that make it suitable for a wide array of applications. Its low dropout voltage, high input voltage range, and robust protection features set it apart from similar models, ensuring efficient and reliable operation in various electronic systems. Despite being marked as obsolete, the LM2931S-5.0 remains a valuable component for designers seeking a compact, efficient, and reliable power solution for their projects.