STMicroelectronics

L4989MD

L4989MD Description

The L4989MD is a linear voltage regulator designed by STMicroelectronics, offering a fixed output voltage of 5V and a maximum output current of 150mA. This regulator is housed in a surface-mount package, making it suitable for compact and space-constrained applications. Despite its small form factor, the L4989MD provides robust performance with a maximum input voltage of 31V and a dropout voltage of only 0.4V at full load. The regulator features low quiescent current of 69 µA and a supply current of 2 mA, ensuring efficient power usage. It also includes advanced control features such as enable, reset output, and watchdog functions, along with protection against over-temperature and short circuits. The L4989MD is REACH unaffected and ROHS3 compliant, ensuring it meets stringent environmental standards. Although the product is now obsolete, its legacy continues to influence modern design practices.

L4989MD Features

• Output Type: Fixed, providing a stable 5V output.
• Input Voltage Range: Up to 31V, making it versatile for various power supply configurations.
• Output Current: Capable of delivering up to 150mA, suitable for low to medium power applications.
• Low Dropout Voltage: Only 0.4V at 150mA, ensuring high efficiency even at low input-to-output voltage differentials.
• Low Quiescent Current: 69 µA, minimizing power consumption during standby.
• Control Features: Includes enable, reset output, and watchdog functions for enhanced control and reliability.
• Protection Features: Over-temperature and short-circuit protection safeguard the regulator and connected circuits.
• Mounting Type: Surface mount, ideal for compact and high-density PCB designs.
• Package: Supplied in a tube, facilitating easy handling and storage.
• Environmental Compliance: REACH unaffected and ROHS3 compliant, ensuring it meets global environmental standards.

L4989MD Applications

The L4989MD is ideal for a variety of applications where a stable and reliable power supply is required. Its fixed 5V output and 150mA current capability make it suitable for powering microcontrollers, sensors, and other low-power electronics. The low dropout voltage and low quiescent current make it particularly useful in battery-powered devices where efficiency and extended battery life are critical. The inclusion of enable, reset, and watchdog functions allows for sophisticated power management in embedded systems. Its compact surface-mount package and robust protection features make it a reliable choice for industrial and automotive applications where space is limited and reliability is paramount.

Conclusion of L4989MD

The L4989MD, despite being obsolete, remains a testament to STMicroelectronics' commitment to delivering high-performance and reliable power solutions. Its unique combination of a fixed 5V output, low dropout voltage, and advanced control features make it stand out in the realm of linear voltage regulators. The L4989MD's low quiescent current and environmental compliance further enhance its appeal for modern, efficient designs. While newer models may have evolved, the L4989MD continues to serve as a benchmark for stability, efficiency, and reliability in power regulation.