LD1085D2M-R

Overview

The LD1085D2M-R is a positive adjustable linear voltage regulator manufactured by STMicroelectronics, housed in a D2PAK-3 surface-mount package. It delivers up to 3A of output current with a maximum dropout voltage of 1.5V at full load. The device supports an input voltage range up to 30V and provides an adjustable output voltage between 1.25V and 28.5V. Key electrical specifications include a quiescent current of 10mA and a power supply rejection ratio (PSRR) of 72dB at 120Hz. It operates within a temperature range of -40°C to 125°C and includes internal overcurrent and thermal overload protection.

Feature Summary

• Provides high-output current capability up to 3A with low dropout performance for efficient voltage regulation.
• Features internal thermal overload and overcurrent protection circuits to ensure device reliability under fault conditions.
• Utilizes a D2PAK-3 surface-mount package designed for effective heat dissipation in compact designs.

Applications

• General-purpose positive voltage regulation in industrial equipment
• Power supply stages for embedded systems requiring stable adjustable voltages
• Battery-powered devices needing efficient linear regulation

Procurement Notes

Verify the specific ordering suffix to confirm the tape and reel configuration, as variations exist for cut tape or Digi-Reel packaging. Ensure the component meets RoHS3 compliance requirements if mandated by your assembly standards. Cross-reference the manufacturer part number LD1085D2M-R with official STMicroelectronics documentation to validate pinout compatibility and thermal characteristics before finalizing procurement.

Selection Notes

Select this component when a robust 3A linear regulator with adjustable output is required in a D2PAK package. It is suitable for applications where input-to-output voltage differential remains within the 1.5V dropout limit at maximum load. Consider its thermal management needs due to power dissipation at high currents. Verify that the required output voltage falls within the 1.25V to 28.5V adjustable range supported by the external resistor network.

Part Context

The LD1085D2M-R belongs to the LD1085 family of low-dropout positive voltage regulators from STMicroelectronics. This series is designed to replace older three-terminal adjustable regulators while offering improved performance in terms of dropout voltage and output tolerance. The D2M-R designation specifically indicates the D2PAK-3 surface-mount package variant with a standard trailing tape reel configuration for automated assembly processes.

FAQ

What is the minimum capacitor requirement for stability?

The datasheet specifies that only a minimum 10µF capacitor is needed for stability, though specific types may be recommended for optimal performance.

How does the quiescent current behave in this regulator?

Unlike PNP-based regulators, the quiescent current in the LD1085 flows into the load rather than being wasted, which helps increase overall efficiency.