LD1085D2M50

Overview

The LD1085D2M50 is a low-dropout linear voltage regulator manufactured by STMicroelectronics, belonging to the LD1085 series. It provides a fixed positive output voltage of 5V with a maximum continuous output current capability of 3A. The device supports an input voltage range up to 30V and operates within a junction temperature range from -40°C to +125°C. It utilizes a D2PAK surface-mount package (TO-263) designed for efficient thermal dissipation. Key electrical characteristics include a maximum dropout voltage of 1.5V at full load and a typical quiescent current of 10mA.

Feature Summary

• Integrated overcurrent protection and thermal shutdown mechanisms ensure device safety under fault conditions.
• Low dropout voltage operation allows efficient regulation even when the input-to-output voltage differential is minimal.
• Fixed 5V output configuration eliminates the need for external feedback resistors, simplifying circuit design.

Applications

• Point-of-load regulation in embedded systems requiring stable 5V power rails.
• Pre-regulation stages for switching regulators to reduce ripple and noise.
• Battery-powered equipment where efficient step-down conversion is required.

Procurement Notes

Verify the specific suffix 'D2M' confirms the D2PAK-3 package variant and 5V fixed output during sourcing. Confirm RoHS compliance status as manufacturing updates may affect environmental declarations. Ensure the supplier provides original manufacturer documentation to validate authenticity against counterfeits. Check lead times as automotive-grade or high-volume variants may have different availability profiles.

Selection Notes

Select this component when a robust 3A LDO is needed for 5V distribution in space-constrained surface-mount designs. The D2PAK package offers superior thermal performance compared to smaller SOT packages. Consider the 30V maximum input rating for applications with significant input voltage headroom. Evaluate thermal resistance requirements based on the expected ambient temperature and PCB copper area for adequate heat sinking.

Part Context

This part belongs to the LD1085 family of high-current low-dropout regulators. The series includes various output voltages and package options such as TO-220, DPAK, and D2PAK. The LD1085 series is designed to replace older three-terminal adjustable regulators while offering better efficiency and lower dropout characteristics. It is widely used in industrial and consumer electronics for power management tasks.

Replacement Considerations

LT1085IT-5#PBF is a documented similar replacement option available from Analog Devices Inc. Verify pinout compatibility and thermal performance equivalence before substitution. Ensure the alternative meets the same 3A current and 5V output specifications.