LD2979M50TR

Overview

The LD2979M50TR is a fixed positive low-dropout voltage regulator from STMicroelectronics, providing a nominal output of 5.0 V with a maximum load current of 50 mA. It operates within an input voltage range up to 16 V and features a typical dropout voltage of 400 mV at full load. The device incorporates logic-controlled electronic shutdown via an inhibit pin, internal thermal and current limiting, and requires only a 1 µF capacitor for stability. It functions across a temperature range of -25 °C to +125 °C in a SOT-23-5L surface-mount package.

Feature Summary

• Logic-controlled electronic shutdown function for standby power management
• Internal protection against overcurrent and thermal overload
• Capable of maintaining stability with minimal external capacitance

Applications

• Battery-powered systems requiring low quiescent current
• Low noise linear regulation applications
• Local regulators enabling board-level standby modes

Procurement Notes

Verify the specific ordering code LD2979M50TR against official STMicroelectronics documentation to confirm the 5.0 V fixed output variant. Ensure the procurement channel provides valid ECOPACK compliant units. Confirm that the supply chain supports the required SOT-23-5L surface mount format and tape-and-reel packaging specifications.

Selection Notes

Select this component when a fixed 5.0 V rail is needed with a 50 mA capacity. It is suitable for designs prioritizing low power consumption due to its low quiescent current profile. The inclusion of an inhibit pin makes it appropriate for systems requiring software-controlled power gating or standby states without disconnecting the main power source.

Part Context

This part belongs to the LD2979 series of very low drop voltage regulators. The series offers multiple fixed output voltages including 3.0 V, 3.3 V, 3.8 V, and 5.0 V. All variants share identical package dimensions and feature sets, differing primarily in their regulated output voltage levels and corresponding order codes.

Replacement Considerations

LD2979XX50