LM1117T-2.85/NOPB

Overview

The LM1117T-2.85/NOPB is a positive low-dropout linear regulator manufactured by Texas Instruments, providing a fixed 2.85 V output with an 800 mA maximum load current capability. It operates within a junction temperature range of 0°C to 125°C and features a typical dropout voltage of 1.2 V at full load. The device incorporates internal current limiting and thermal shutdown protection mechanisms. It utilizes a Zener-trimmed bandgap reference to ensure output voltage accuracy within ±1%. The component is housed in a TO-220 three-pin package.

Feature Summary

• Integrated current limiting and thermal shutdown for robust operation under fault conditions
• Zener-trimmed bandgap reference ensures high output voltage accuracy
• Low dropout voltage characteristic enables efficient power conversion
• Internal circuitry eliminates the need for external protection diodes during normal operation

Applications

• Post regulator for switching DC-DC converters
• Battery charger circuits
• Portable instrumentation power supplies

Procurement Notes

Verify that the specific part number matches the required fixed voltage output of 2.85 V, as the LM1117 family includes multiple standard voltages. Confirm the suffix NOPB indicates lead-free and RoHS compliance. Ensure the TO-220 package variant aligns with the thermal management and mounting requirements of the target design. Cross-reference the manufacturer's latest datasheet for any updates regarding pin configurations or recommended operating conditions.

Selection Notes

Select this component when a stable 2.85 V rail is required with up to 800 mA of continuous current. The TO-220 package is suitable for applications requiring through-hole mounting and higher thermal dissipation capabilities compared to surface-mount options. Consider the input-to-output voltage differential to ensure the dropout voltage specification is met across the entire operating temperature range. Verify that the system ground connections minimize line resistance effects on load regulation.

Part Context

This device belongs to the LM1117 series of low-dropout linear regulators from Texas Instruments. The series offers both adjustable and fixed output versions in various packages including SOT-223, WSON, TO-252, and TO-263. The LM1117T-2.85/NOPB specifically denotes the fixed 2.85 V version in the TO-220 package. The 'T' suffix typically identifies the TO-220 package style within the product line.

Replacement Considerations

LM1117T-2.85/NOPB