LM1086IS-1.8

Overview

The LM1086IS-1.8/NOPB is a positive low-dropout linear voltage regulator manufactured by Texas Instruments, delivering a fixed 1.8 V output at up to 1.5 A. It operates within an input voltage range of 2.6 V to 30 V and features a typical dropout voltage of 1.3 V at full load. The device includes internal thermal overload and current-limiting protection. It is housed in a D2PAK-3 (TO-263-3) surface-mount package and supports operation from -40 °C to +125 °C.

Feature Summary

• Fixed 1.8 V output configuration for direct system integration
• Integrated thermal shutdown and current limiting for robust operation
• Low dropout characteristic enabling efficient power conversion

Applications

• Portable battery-powered equipment requiring stable low-voltage rails
• Post-regulation for switching power supplies
• Embedded systems with 1.8 V logic requirements

Procurement Notes

Verify the suffix /NOPB indicates lead-free and RoHS compliance. Confirm the IS variant corresponds to the TO-263-3 package. Ensure the specific 1.8 V fixed output matches the design requirement rather than the adjustable version.

Selection Notes

Select this component when a fixed 1.8 V rail is required without external resistors. The TO-263-3 package offers superior thermal dissipation compared to smaller SOT packages. Verify that the input voltage remains within the 30 V maximum limit under all operating conditions.

Part Context

This part belongs to the LM1086 family of 1.5 A LDO regulators. It shares architectural similarities with the LM1085 but provides lower current capability. The series is designed for general-purpose linear regulation applications where moderate efficiency and high reliability are prioritized over ultra-low quiescent current consumption.

Replacement Considerations

LM1086IS-1.8/NOPB serves as the direct lead-free replacement for the older LM1086IS-1.8.