LD1084D2M18R

Overview

The LD1084D2M18R is a fixed-output low-dropout positive voltage regulator manufactured by STMicroelectronics. It provides a nominal output voltage of 1.8V with a guaranteed maximum output current of 5A. The device operates within an input voltage range up to 30V and features a typical dropout voltage of 1.3V at full load, with a maximum guaranteed dropout of 1.5V. It offers high accuracy with an output tolerance of ±1% at 25°C and ±2% across the full temperature range. The component is housed in a D2PAK surface-mount package and supports an operating junction temperature range from -40°C to +125°C.

Feature Summary

• Provides stable regulated power with a fixed 1.8V output and high current capability up to 5A.
• Features internal thermal limiting and short-circuit protection for robust operation under fault conditions.
• Quiescent current flows into the load rather than being wasted, increasing overall system efficiency compared to PNP regulators.

Applications

• Power supply stages for SCSI-2 active termination systems
• Voltage regulation for portable electronic devices requiring efficient power management
• General-purpose linear regulation in industrial equipment

Procurement Notes

Verify the specific ordering suffix 'R' corresponds to tape-and-reel packaging when sourcing components. Confirm that the fixed 1.8V output variant matches the design requirements, as the LD1084 series includes adjustable and other fixed voltage options. Ensure compatibility with the D2PAK footprint and check for any environmental compliance markings such as ECOPACK on the final product.

Selection Notes

Select this component when a fixed 1.8V rail is required with high current delivery capabilities. The D2PAK package is suitable for applications needing better thermal dissipation than smaller SMD packages while maintaining a surface-mount profile. Consider the dropout characteristics relative to the minimum input voltage available in the system to ensure regulation is maintained at maximum load currents.

Part Context

This part belongs to the LD1084 series of low-dropout positive voltage regulators. The series is designed to be pin-compatible with older three-terminal adjustable regulators but offers improved performance regarding dropout voltage and output tolerance. The family includes various fixed voltage outputs ranging from 1.5V to 12V, as well as an adjustable version, all capable of delivering up to 5A.

Replacement Considerations

LD1084D2M18