LM1086IS-2.85/NOPB

Overview

The LM1086IS-2.85/NOPB is a fixed positive low-dropout linear regulator manufactured by Texas Instruments, designed to deliver a maximum output current of 1.5 A. It provides a precise fixed output voltage of 2.85 V with a typical dropout voltage of 1.3 V at full load. The device operates within an input voltage range of 3.3 V to 30 V and features a typical power supply rejection ratio (PSRR) of 72 dB at 120 Hz. It supports operation over an extended temperature range from -40°C to +125°C and utilizes a D2PAK-3 (TO-263-3) surface-mount package.

Feature Summary

• Provides a fixed positive output voltage of 2.85 V for stable power supply applications
• Capable of delivering up to 1.5 A output current with low dropout characteristics
• Features high ripple rejection performance suitable for noise-sensitive circuits
• Includes internal thermal overload protection and safe operating area safeguards

Applications

• Point-of-load regulation in embedded systems
• Battery-powered equipment requiring efficient voltage stepping
• General-purpose power supplies for industrial control modules
• Communication infrastructure power distribution networks

Procurement Notes

Verify the specific suffix 'NOPB' indicates lead-free and RoHS compliance status as per manufacturer specifications. Confirm the package marking matches the TO-263-3 form factor required for your PCB layout. Ensure the supplier provides valid traceability documentation for automotive or industrial grade requirements if applicable. Cross-reference the datasheet revision date to ensure compatibility with current design standards.

Selection Notes

Select this component when a fixed 2.85 V rail is required with high current capability. Consider the thermal resistance of the D2PAK package for heat dissipation planning under maximum load conditions. Evaluate the minimum input voltage requirement relative to the source supply to maintain adequate headroom above the dropout voltage. Compare PSRR requirements against upstream noise sources to determine if additional filtering is necessary.

Part Context

This part belongs to the LM1086 family of 1.5 A low-dropout regulators, which offers both fixed and adjustable output options. The 'IS' designation specifies the surface-mount D2PAK-3 package variant, distinguishing it from through-hole TO-220 versions like the LM1086CT series. The family is characterized by robust protection features and wide input voltage ranges, making it suitable for diverse power management tasks in consumer and industrial electronics.

Replacement Considerations

Direct substitutes include other LM1086 variants with identical 2.85 V fixed output and compatible packaging, such as the LM1086ISX-2.85/NOPB. Verify pinout compatibility and thermal pad connectivity when replacing with equivalent parts from different manufacturers. Ensure that alternative components meet the same 1.5 A current rating and 30 V maximum input voltage limits.