LM1117LD-2.5

Overview

The LM1117LD-2.5 is a fixed-output low-dropout linear regulator manufactured by Texas Instruments, providing a nominal 2.5 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. Its circuit utilizes a Zener-trimmed bandgap reference to ensure output voltage accuracy within ±1%. A minimum 10 µF tantalum capacitor is required at the output terminal to maintain stability and improve transient response.

Feature Summary

• Provides a fixed 2.5 V output regulated by an internal Zener-trimmed bandgap reference for high accuracy.
• Incorporates built-in current limiting and thermal shutdown protection to safeguard against overload conditions.
• Delivers low dropout performance, requiring minimal input-to-output differential voltage at high load currents.

Applications

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

Procurement Notes

Verify that the specific part number suffix corresponds to the LD package variant, as standard LM1117 parts may utilize different packaging such as TO-220 or SOT-223. Confirm RoHS compliance status through official manufacturer documentation. Ensure the selected component meets the required operating temperature range of 0°C to 125°C for your specific application environment before procurement.

Selection Notes

Select this component when a stable 2.5 V rail is required for analog or digital logic circuits drawing up to 800 mA. Consider the thermal resistance characteristics of the LD package if significant power dissipation is expected. Ensure the input voltage remains sufficiently above the output voltage to account for the dropout voltage across the entire operating temperature range.

Part Context

This component belongs to the LM1117 family of low-dropout linear regulators from Texas Instruments. The family offers various fixed output voltages including 1.8 V, 3.3 V, and 5 V, alongside adjustable versions. The LM1117 series is widely used in portable electronics due to its space-saving packages and ability to replace traditional three-terminal regulators like the 78xx series while offering superior dropout performance.

Replacement Considerations

LM1117T-2.5/NOPB

FAQ

What is the minimum output capacitance required for stability?

A minimum of 10 µF tantalum capacitor is required at the output to ensure stability and improve transient response.

How does the LM1117LD-2.5 handle overcurrent conditions?

The device includes internal current limiting circuitry that restricts the output current to protect the regulator during short-circuit or overload events.