LDK320M25R

Overview

The LDK320M25R is a fixed-output low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides a nominal output voltage of 2.5 V with a maximum continuous output current of 200 mA. The device operates from an input voltage range of 2.5 V to 18 V and features a typical dropout voltage of 100 mV at a 100 mA load. It incorporates logic-controlled electronic shutdown, reducing quiescent current to less than 1 μA in off mode. The regulator includes short-circuit current limiting, thermal protection, and over-current protection.

Feature Summary

• Logic-controlled electronic shutdown for ultra-low power consumption
• High power supply rejection ratio (PSRR) for noise reduction
• Integrated short-circuit, thermal, and SOA protections
• Compatible with ceramic output capacitors

Applications

• Digital Signal Controllers (DSC)
• Television systems
• Blu-ray and DVD players
• Personal computers
• Industrial equipment

Procurement Notes

Verify the specific suffix 'M' against the official datasheet to confirm it denotes the standard tolerance version rather than the high-accuracy 'A' variant. Confirm package availability matches the required SOT23-5L or SOT-89 form factor. Ensure the ordering code aligns with the fixed 2.5 V output specification provided in the documentation.

Selection Notes

Select this component when a stable 2.5 V rail is required for digital logic or reference circuits within battery-powered or portable devices. The low dropout characteristic supports operation near the minimum input voltage threshold. Verify that the application load does not exceed the 200 mA limit and that the input voltage remains within the specified 18 V maximum rating.

Part Context

This part belongs to the LDK320 family of low-dropout regulators designed for high accuracy and high PSRR performance. The series offers various fixed output voltages and adjustable versions. The M suffix typically indicates the standard ±2% output voltage tolerance, distinguishing it from the A suffix which provides tighter ±0.5% accuracy.

Replacement Considerations

Consult the manufacturer's cross-reference tools for verified substitutes. Ensure any replacement maintains the 200 mA output current capability, compatible SOT23-5L or SOT-89 pinout, and similar dropout voltage characteristics.