LD39015M125R

Overview

The LD39015M125R is a fixed-output linear low-dropout voltage regulator manufactured by STMicroelectronics. It provides a fixed output voltage of 1.25 V with a maximum output current of 150 mA. The device operates within an input voltage range of 1.5 V to 5.5 V and features a typical dropout voltage of 80 mV at a 100 mA load. Quiescent current is typically 18 μA at no load and 38 μA at full load, dropping below 1 μA in shutdown mode. It includes logic-controlled enable functionality, short-circuit constant current limiting, and thermal protection.

Feature Summary

• Ultra-low dropout voltage capability for efficient power management
• Logic-controlled electronic shutdown for extended battery life
• Internal short-circuit current limiting and thermal protection mechanisms

Applications

• Mobile phones
• Personal digital assistants (PDAs)
• Cordless phones
• Battery-powered systems

Procurement Notes

Verify the specific package type SOT-23-5 and output voltage tolerance of ±2.0% against design requirements. Confirm that the operating temperature range of -40°C to 125°C meets environmental specifications. Ensure ceramic capacitors are used as recommended for stability. Check RoHS compliance status for regulatory adherence.

Selection Notes

Select this component when a stable 1.25 V rail is required from a single-cell lithium-ion or similar battery source. The low quiescent current makes it suitable for portable devices where standby power consumption is critical. Verify that the input voltage remains within the 1.5 V to 5.5 V range during all operational states.

Part Context

This part belongs to the LD39015 series of low quiescent current, low noise voltage regulators. The series is designed for low-power applications requiring high efficiency and minimal noise. Other variants in the series offer different fixed output voltages ranging from 0.8 V to 3.3 V with 100 mV steps, sharing similar electrical characteristics and protection features.

Replacement Considerations

Publicly confirmed substitute part numbers for LD39015M125R were not found in the provided documentation.