LD1085P

Overview

The LD1085P is a fixed positive low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides up to 3A of output current with a maximum dropout voltage of 1.5V at full load. The device supports a maximum input voltage of 30V and operates within a junction temperature range of -40°C to 125°C. It features internal overcurrent and thermal shutdown protection mechanisms to ensure reliability under fault conditions.

Feature Summary

• Provides stable fixed positive output voltage regulation for electronic circuits
• Capable of delivering high output current up to 3A with low dropout characteristics
• Includes integrated thermal overload and current limit protection functions

Applications

• General purpose power supply regulation in industrial equipment
• Battery-powered systems requiring efficient voltage step-down
• Embedded systems needing stable logic supply rails

Procurement Notes

Verify the specific suffix code (e.g., P, D2, DT) to confirm the exact package type and output voltage variant, as the base part number covers multiple configurations. Confirm RoHS compliance status and lead-free availability through official datasheets or authorized distributors before ordering. Ensure the selected variant matches the required thermal management strategy for the target application environment.

Selection Notes

Select this component when a fixed output voltage is required with high current capability. Consider the thermal dissipation requirements based on the input-output voltage differential and load current. Verify that the chosen package variant meets the PCB layout constraints and mounting style requirements of the design.

Part Context

This component belongs to the LD1085 series of low-dropout regulators designed for applications requiring high current performance. The series includes various fixed voltage options and package types to suit different power and space constraints. It serves as a robust solution for replacing older three-terminal adjustable regulators in modern designs.

Replacement Considerations

Check pin-to-pin compatibility with legacy adjustable regulators if direct replacement is intended. Verify that alternative LDOs offer comparable dropout voltage and current handling capabilities. Ensure thermal resistance values of substitute packages are suitable for the existing heat sinking arrangement.