LD1085D2M

Overview

The LD1085D2M is a low-dropout linear voltage regulator manufactured by STMicroelectronics, designed to deliver up to 3A of output current. It features a fixed 1.8V output and operates within an input voltage range of up to 30V. The device guarantees a maximum dropout voltage of 1.2V at full load, ensuring stable regulation under varying conditions. It utilizes a D²PAK-3 surface-mount package for efficient thermal management and includes internal protections against overcurrent and thermal overload.

Feature Summary

• Provides high-output current capability suitable for demanding power supply applications
• Ensures stable operation with guaranteed low dropout voltage characteristics across load ranges
• Integrates comprehensive protection mechanisms including thermal limiting and current limiting

Applications

• General-purpose positive voltage regulation in electronic circuits
• Pre-regulator stages for switching converters
• Power supplies for microprocessor-based systems requiring stable 1.8V rails

Procurement Notes

Verify the specific suffix code on the component marking to confirm the exact output voltage variant, as the base part number covers multiple fixed voltages. Ensure the ordering documentation specifies the D²PAK-3 package type. Confirm RoHS compliance status if required for your manufacturing process. Cross-reference the manufacturer's latest datasheet revision to ensure compatibility with your design specifications.

Selection Notes

Select this component when a fixed 1.8V output is required with high current capacity. It is suitable for applications where noise sensitivity is moderate but efficiency is less critical than in switching regulators. Consider the thermal dissipation requirements given the linear topology and potential heat generation at higher input-to-output voltage differentials. Ensure adequate heatsinking or PCB copper area for thermal management.

Part Context

This component belongs to the LD1085 family of low-dropout regulators from STMicroelectronics. The family offers various fixed and adjustable output voltage options with current ratings up to 3A. These regulators are designed as pin-compatible replacements for older three-terminal adjustable regulators while offering improved performance in terms of dropout voltage and output tolerance.

FAQ

What is the minimum capacitor value required for stability?

A minimum capacitance of 10µF is required for stability.

Does the quiescent current flow into the load?

Yes, unlike PNP regulators, the quiescent current flows into the load, which increases overall efficiency.