Texas Instruments

LP38843S-1.5

LP38843S-1.5 Description

The LP38843S-1.5 is a fixed-output linear regulator designed by Texas Instruments, offering a robust and efficient solution for power management applications. This regulator is designed to provide a stable 1.5V output voltage with a maximum output current of 3A. It features a low dropout voltage of 0.5V at 3A, ensuring high efficiency even under varying input conditions. The LP38843S-1.5 is housed in a surface-mount DDPAK/TO263-5 package, making it suitable for compact and high-density PCB designs. Despite its small form factor, the regulator is equipped with comprehensive protection features, including over-current, over-temperature, and short-circuit protection, ensuring reliable operation in demanding environments.

LP38843S-1.5 Features

• Output Type: Fixed 1.5V output voltage, providing a stable power supply for sensitive applications.
• Input Voltage Range: Operates with a maximum input voltage of 5.5V, offering flexibility in power source selection.
• Output Current: Capable of delivering up to 3A of output current, making it suitable for high-power applications.
• Low Dropout Voltage: A maximum dropout voltage of 0.5V at 3A ensures efficient power conversion, even at low input-to-output voltage differentials.
• Control Features: Includes an enable pin, allowing for dynamic control of the regulator's operation.
• Protection Features: Over-current, over-temperature, and short-circuit protection enhance reliability and safeguard against potential faults.
• Low Quiescent Current: A quiescent current of 30 µA minimizes power consumption during standby conditions.
• High PSRR: A power supply rejection ratio of 80dB to 65dB across a frequency range of 120Hz to 1kHz ensures minimal noise and ripple on the output voltage.
• Moisture Sensitivity Level: MSL 3 (168 hours) ensures the regulator can withstand moisture exposure during manufacturing processes.
• Mounting Type: Surface-mount technology (SMT) allows for easy integration into modern PCB designs.
• Package: The DDPAK/TO263-5 package provides a compact and thermally efficient solution.

LP38843S-1.5 Applications

The LP38843S-1.5 is ideal for a variety of applications where a stable and efficient power supply is required. Its fixed 1.5V output and high current capability make it suitable for powering digital and analog circuits in consumer electronics, industrial control systems, and communication devices. The regulator's low dropout voltage and high PSRR ensure minimal power loss and noise, making it an excellent choice for applications sensitive to voltage fluctuations and noise. Specific use cases include:

• Consumer Electronics: Powering microcontrollers, sensors, and other low-voltage components in smartphones, tablets, and IoT devices.
• Industrial Systems: Providing a stable power supply for PLCs, motor controllers, and other industrial automation equipment.
• Communication Devices: Ensuring reliable power delivery in routers, switches, and other networking equipment.

Conclusion of LP38843S-1.5

The LP38843S-1.5 from Texas Instruments is a versatile and efficient linear regulator that offers a stable 1.5V output with a maximum current of 3A. Its low dropout voltage, high PSRR, and comprehensive protection features make it a reliable choice for a wide range of power management applications. Despite its small form factor, the regulator is designed to withstand demanding conditions, making it an ideal solution for compact and high-density PCB designs. While the product is now obsolete, its technical specifications and performance benefits continue to make it a valuable reference for engineers and designers in the electronics industry.