Texas Instruments

LP3855ESX-3.3

LP3855ESX-3.3 Description

The LP3855ESX-3.3 is a linear regulator designed by Texas Instruments, offering a fixed output voltage of3 .3V and a maximum output current of 1.5A. This regulator is part of the Power Management Integrated Circuits (PMIC) category and is housed in a surface-mount DDPAK package. It features a maximum input voltage of 7V and a dropout voltage of 0.38V at full load, ensuring efficient operation even at high current outputs. The LP3855ESX-3.3 includes also an enable control feature, allowing for precise control over the regulator's operation. It is designed with over-current, over-temperature, and short-circuit protection, enhancing its reliability and safety. Despite being marked as obsolete, this regulator remains a robust solution for applications requiring a stable 3.3V supply.

LP3855ESX-3.3 Features

• Output Type: Fixed at 3.3V, ensuring a stable power supply for various electronic components.
• Input Voltage Range: Up to 7V, providing flexibility in power source selection.
• Output Current: Capable of delivering up to 1.5A, suitable for demanding applications.
• Low Dropout Voltage: 0.38V at 1.5A, which minimizes power loss and improves efficiency.
• Control Features: Includes an enable pin, for allowing dynamic control of the regulator's operation.
• Protection Features: Over-current, over-temperature, and short-circuit protection ensure robustness and reliability.
• Low Quiescent Current: 3mA, which helps in reducing power consumption during standby.
• High PSRR: Ranging from 73dB to 57dB at 120Hz, ensuring minimal noise and ripple in the output voltage.
• Moisture Sensitivity Level: MSL 3 (168 hours), suitable for various environmental conditions.
• Mounting Type: Surface mount, ideal for compact and high-density designs.
• Package: Tape & Reel (TR), facilitating automated assembly processes.

LP3855ESX-3.3 Applications

The LP3855ESX-3.3 is ideal for a range of applications that require a stable 3.3V supply with high current capabilities. Its low dropout voltage and high PSRR make it suitable for sensitive electronic circuits where noise and efficiency are critical. Specific use cases include:

• Power Supply for Microcontrollers: Provides a stable 3.3V supply for microcontrollers and other low-voltage digital circuits.
• Embedded Systems: Ideal for embedded systems requiring a reliable power source with minimal power loss.
• Communication Equipment: Suitable for powering communication modules and interfaces that need a clean power supply.
• Industrial Control Systems: Can be used in industrial applications where high reliability and protection features are essential.
• Consumer Electronics: Applicable in consumer devices that require a compact and efficient power solution.

Conclusion of LP3855ESX-3.3

The LP3855ESX-3.3 from Texas Instruments is a versatile linear regulator that offers a stable 3.3V output with a maximum current of 1.5A. Its low dropout voltage and high PSRR make it an efficient and reliable choice for a variety of applications. The inclusion of enable control and comprehensive protection features further enhance its performance and safety. Although marked as obsolete, the LP3855ESX-3.3 remains a valuable component for applications requiring a robust and efficient power management solution.