STMicroelectronics

L4931ABD50

L4931ABD50 Description

The L4931ABD50 from STMicroelectronics is a fixed-output linear voltage regulator designed to deliver a stable 5V output with a maximum current of 250mA. It operates within an input voltage range up to 20V, making it suitable for a variety of power supply applications. With a low dropout voltage of 0.8V at 250mA, it ensures efficient performance even when the input voltage is close to the output level. The device features over-current and over-temperature protection, enhancing reliability in demanding environments. Although marked as obsolete, it remains a robust choice for legacy designs due to its low quiescent current (1 mA) and high PSRR (70dB ~ 55dB), which minimizes noise in sensitive circuits.

L4931ABD50 Features

• Fixed 5V Output: Ensures stable voltage regulation for low-power applications.
• Low Dropout Voltage: 0.8V @ 250mA maximizes efficiency in tight voltage margins.
• High PSRR: 70dB ~ 55dB (120Hz ~ 10kHz) reduces power supply noise for precision electronics.
• Protection Mechanisms: Includes over-current and over-temperature safeguards.
• Low Quiescent Current: 1 mA minimizes power consumption in standby modes.
• Wide Input Range: Supports up to 20V, accommodating various power sources.
• RoHS3 Compliant & REACH Unaffected: Meets environmental and regulatory standards.
• Surface-Mount Package (8SO): Compact and suitable for automated PCB assembly.

L4931ABD50 Applications

• Embedded Systems: Power management for microcontrollers and sensors.
• Automotive Electronics: Auxiliary power supplies in infotainment or dashboard systems.
• Industrial Controls: Voltage regulation for PLCs and low-power instrumentation.
• Consumer Electronics: Used in portable devices requiring stable 5V rails.
• Legacy Designs: Ideal for maintaining existing systems where component obsolescence is managed.

Conclusion of L4931ABD50

The L4931ABD50 is a reliable, low-dropout linear regulator offering high noise suppression, robust protection features, and efficient power management. While obsolete, its performance metrics—such as low quiescent current and high PSRR—make it a viable option for legacy or low-power designs. Its 8SO package ensures compatibility with space-constrained applications, and its wide input range provides flexibility across multiple industries. Engineers seeking a cost-effective, stable 5V regulator for noise-sensitive or power-efficient systems may still find value in this component.