LD1085DT-R

Overview

The LD1085DT-R is a positive fixed linear voltage regulator manufactured by STMicroelectronics, delivering up to 3A of output current. It provides a fixed 1.8V output with a maximum dropout voltage of 1.5V at full load. The device supports an input voltage range up to 30V and features a Power Dissipation Package (DPAK) for surface mount installation. Internal protections include overcurrent limiting and thermal shutdown. The component operates within a temperature range of -40°C to +125°C.

Feature Summary

• Provides stable 1.8V fixed output with high current capability up to 3A
• Incorporates internal thermal shutdown and overcurrent protection mechanisms
• Designed for low dropout operation to maximize efficiency under varying loads

Applications

• General purpose power supply regulation in electronic circuits
• Pre-regulator stages for switching power supplies
• Battery-powered systems requiring efficient voltage step-down

Procurement Notes

Verify the exact suffix designation against official manufacturer documentation, as variations exist within the LD1085 family. Confirm RoHS compliance status and lead times directly with authorized distributors or the manufacturer, as availability may vary based on production lifecycle stages. Ensure the DPAK package matches your PCB footprint requirements before ordering.

Selection Notes

Select this component when a fixed 1.8V rail is required with significant current demand. The DPAK package offers a balance between thermal performance and board space. Consider the 1.5V dropout characteristic to ensure sufficient input-output differential. Verify that the application environment stays within the specified operating temperature limits for reliable long-term performance.

Part Context

This part belongs to the LD1085 series of low-dropout regulators from STMicroelectronics. The series includes various output voltages and packages, such as D2PAK and TO-220. The DT suffix typically denotes the DPAK surface-mount package. This family is designed for applications requiring robust current handling and simple implementation without external feedback components for fixed versions.

Replacement Considerations

Check for pin-compatible alternatives within the same LD1085 series offering different output voltages if 1.8V is not strictly required. Verify electrical parameters such as dropout voltage and quiescent current against specific design constraints. Consult official substitution guides for any updated generations or enhanced performance variants.