LD1086D2MTR

Overview

The LD1086D2MTR is a positive adjustable low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides an output current of up to 1.5 A with an input voltage range from 3.4 V to 30 V. The device features an adjustable output voltage range between 1.25 V and 15 V, utilizing a reference voltage of 1.25 V. Key electrical parameters include a maximum dropout voltage of 1.5 V at full load, line regulation of 0.015%, and load regulation of 0.2%. Quiescent current is specified at 5 mA to 10 mA. The component operates within a temperature range of -40°C to +125°C and is housed in a D2PAK-3 surface-mount package.

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 including thermal limiting and overcurrent protection to ensure device safety under fault conditions.
• Maintains stable operation with minimal external components, requiring only a minimum 10 μF capacitor for stability.

Applications

• Battery-powered systems requiring efficient linear regulation
• Post-regulation stages for switching power supplies
• General-purpose power management in embedded electronics

Procurement Notes

Verify the specific ordering suffix to confirm the package type and tape-and-reel configuration. Ensure compatibility with D2PAK footprint dimensions during PCB layout. Confirm RoHS compliance status if required by assembly specifications. Cross-reference datasheet revisions for any pinout or electrical parameter updates before finalizing procurement.

Selection Notes

Select this component when a fixed-output LDO is insufficient due to varying voltage requirements. The adjustable nature allows customization via external resistors. Consider the thermal dissipation capabilities of the D2PAK package relative to the expected power loss. Verify that the input voltage remains sufficiently above the desired output to maintain regulation within the specified dropout limits.

Part Context

This part belongs to the LD1086 family of 1.5 A low-dropout regulators. It shares pinout compatibility with older three-terminal adjustable regulators while offering improved dropout performance and tighter output tolerance. The family includes both fixed and adjustable variants available in multiple packages such as TO-220, DPAK, and DFN8.

Replacement Considerations

LT1086IM#TRPBF is a similar adjustable 1.5A regulator but has a lower maximum input voltage of 25V compared to the LD1086's 30V limit. Verify thermal performance and pinout alignment before substitution.