LD1086V33-DG

Overview

The LD1086V33-DG is a fixed-output low-dropout positive voltage regulator from the STMicroelectronics LD1086 series. It provides a stable 3.3 V output with a maximum current capacity of 1.5 A. The device operates within an input voltage range of 3.4 V to 30 V and features a typical dropout voltage of 1.3 V at full load, with a maximum of 1.5 V. It maintains high precision with an output tolerance of ±1% at 25 °C and ±2% across the full temperature range. The regulator includes internal thermal overload and short-circuit protection. It requires a minimum 10 μF output capacitor for stability and functions reliably in temperatures from -40 °C to +125 °C.

Feature Summary

• Fixed 3.3 V output with ±1% initial accuracy
• Low dropout voltage ensures efficient regulation under minimal headroom
• Integrated thermal shutdown and current limiting protect against overload conditions

Applications

• Power supply stages for embedded systems requiring stable 3.3 V rails
• Battery-powered devices needing efficient linear regulation
• General-purpose positive voltage regulation in industrial equipment

Procurement Notes

Verify the specific suffix 'DG' corresponds to the TO-220-3 through-hole package configuration as documented. Confirm RoHS compliance status via the manufacturer's official documentation before integration. Ensure ordering quantities align with tube packaging specifications rather than reel formats used for surface-mount variants.

Selection Notes

Select this component when a robust through-hole solution is required for 3.3 V regulation up to 1.5 A. The TO-220-3 package facilitates heat dissipation for higher current applications compared to surface-mount alternatives. Verify that the input voltage remains within the 30 V maximum limit and that the dropout characteristics meet the system's headroom requirements.

Part Context

This part belongs to the LD1086 family of low-dropout regulators designed for high-current applications. The family offers both adjustable and fixed output versions in various packages including TO-220, D²PAK, and DFN8. The LD1086V33-DG specifically denotes the fixed 3.3 V variant in the TO-220-3 package, distinguishing it from surface-mount or adjustable counterparts within the same product line.

Replacement Considerations

LD1086DT33 (Surface-mount DPAK equivalent)

FAQ

What is the minimum output capacitance required for stability?

A minimum of 10 μF is required on the output pin to ensure stable operation.

How does the quiescent current behave in this regulator?

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