STMicroelectronics

L4931CDT33

L4931CDT33 Description

The L4931CDT33 is a linear voltage regulator designed by STMicroelectronics, offering a fixed output voltage of 3.3V with a maximum output current of 250mA. This device is housed in a DPAK package, suitable for surface-mount applications. It is compliant with RoHS3 and REACH regulations, making it an environmentally friendly choice for electronic designs. Despite being classified as obsolete, it still offers reliable performance for specific applications.

L4931CDT33 Features

• Fixed Output Voltage: Provides a stable 3.3V output, ideal for applications requiring a consistent voltage supply.
• High Output Current: Capable of delivering up to 250mA, making it suitable for powering various electronic components.
• Single Regulator Design: Simplifies circuit design with its one-regulator configuration.
• Positive Output Configuration: Facilitates easy integration into positive voltage supply systems.
• Low Dropout Voltage: With a maximum dropout of 0.8V @ 250mA, it maintains high efficiency even under load.
• PSRR: Offers excellent power supply rejection ratio, ranging from 73dB at 120Hz to 55dB at 10kHz, ensuring stable operation under varying power conditions.
• Protection Features: Incorporates over-current and over-temperature protection to safeguard the device and the system.

L4931CDT33 Applications

The L4931CDT33 is well-suited for applications where a stable and reliable 3.3V supply is needed, such as:

• Portable Electronics: Due to its low quiescent current of 1mA, it is ideal for battery-powered devices.
• Industrial Controls: Provides a stable power supply for microcontrollers and sensors in industrial environments.
• Telecommunications: Can be used in base stations and other telecom equipment requiring a fixed 3.3V output.

Conclusion of L4931CDT33

While the L4931CDT33 is now considered obsolete, it remains a viable option for applications that do not require the latest technology but demand reliability and stability. Its fixed 3.3V output, combined with a high output current and robust protection features, makes it suitable for a range of electronic devices. Although it may not offer the advanced features of newer models, its proven performance and compliance with environmental standards make it a solid choice for legacy systems and specific applications where a 3.3V supply is required.