LD1085D2T15R

Overview

The LD1085D2T15R is a fixed-output low-dropout positive voltage regulator manufactured by STMicroelectronics. It provides a stable 1.5V output with a maximum continuous current of 3A. The device supports input voltages up to 30V and operates within a temperature range of -40°C to +125°C. It utilizes a D²PAK (TO-263) surface-mount package with three terminals. Dropout voltage is guaranteed at a maximum of 1.2V at full load, decreasing under lighter loads. Quiescent current is specified at 5mA.

Feature Summary

• Provides high-efficiency power regulation by directing quiescent current into the load rather than wasting it as heat, unlike traditional PNP regulators.
• Features internal protection mechanisms against overcurrent conditions and excessive thermal stress to ensure operational reliability.
• Maintains stability with minimal external components, requiring only a minimum capacitance of 10µF for proper operation.

Applications

• Power management systems requiring efficient step-down conversion from higher bus voltages.
• Local voltage regulation in battery-powered portable electronic devices.
• Biasing circuits for analog and digital logic components needing precise low-voltage supplies.

Procurement Notes

Verify the specific suffix '15' confirms the 1.5V fixed output variant. Confirm the 'D2T' designation matches the required TO-263 surface-mount package type. Ensure the 'R' suffix aligns with the preferred reel packaging format for automated assembly processes.

Selection Notes

Select this component when a fixed 1.5V rail is required with high current capability. The D²PAK package offers superior thermal dissipation compared to smaller SOT packages. Verify that the input voltage remains within the 30V absolute maximum rating during all operating transients.

Part Context

This part belongs to the LD1085 series of low-dropout linear regulators designed for high-current applications. The series includes both adjustable and fixed output versions across various packages such as TO-220 and DFN. The LD1085D2T15R specifically targets surface-mount designs requiring robust thermal performance and tight voltage tolerance.

Replacement Considerations

Direct pin-compatible alternatives include other fixed 1.5V LDOs from the same manufacturer family or equivalent parts from other vendors offering similar 3A current ratings and D²PAK footprints. Verify thermal resistance values match the application's heat dissipation requirements.