LD1086DTTR

Overview

The LD1086DTTR is a low-dropout positive voltage regulator manufactured by STMicroelectronics, designed to deliver up to 1.5 A of output current. It features an adjustable output voltage range from 2.85 V to 30 V and supports a maximum input voltage of 30 V. The device operates within a temperature range of -40 °C to +125 °C and utilizes a TO-252-3 (D²PAK) surface-mount package with three pins. Key electrical specifications include a typical dropout voltage of 1.3 V at full load, a line regulation of 0.2 %, and a load regulation of 0.3 %. The quiescent current is specified at 5 mA, and the output voltage tolerance is maintained within ±1 %.

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 power limiting to ensure safe operation under fault conditions.
• Maintains stability with minimal external components, requiring only a minimum 10 μF capacitor for proper function.

Applications

• General-purpose linear power supplies requiring adjustable output voltages
• Battery-powered systems where efficient power management is critical
• Post-regulation stages for switching power supplies

Procurement Notes

Verify the specific suffix 'DTTR' corresponds to the TO-252-3 package and adjustable output variant when sourcing. Confirm that the component meets RoHS compliance requirements if mandated by your design standards. Ensure that the ordering documentation explicitly references the manufacturer part number LD1086DTTR to avoid confusion with fixed-voltage variants or different package types within the same family.

Selection Notes

Select this component when an adjustable output voltage is required alongside high current capability in a compact surface-mount form factor. It serves as a suitable replacement for older three-terminal adjustable regulators due to improved dropout performance and tighter output tolerance. Consider the thermal dissipation capabilities of the D²PAK package relative to the expected load current and ambient temperature conditions.

Part Context

This component belongs to the LD1086 series of low-dropout voltage regulators. The series offers both fixed and adjustable output options across various packages including TO-220, D²PAK, and DFN8. The LD1086DTTR specifically represents the adjustable version housed in the TO-252-3 package, providing pin-to-pin compatibility with standard adjustable regulators while offering superior efficiency and thermal performance.

Replacement Considerations

The LD1086DTTR is pin-compatible with older three-terminal adjustable regulators. Verify that any substitute maintains the same TO-252-3 footprint and adjustable output functionality. Cross-reference datasheets to ensure equivalent dropout voltage and current handling capabilities are met.