LK112M27TR

Overview

The LK112M27TR is a low-noise, low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides a fixed 2.7V output with a maximum current of 150 mA. The device features an integrated electronic shutdown function controllable via TTL or CMOS logic levels. It operates within an input voltage range of 2.5 V to 14 V and maintains a typical dropout voltage of 350 mV at 50 mA. The unit is housed in a compact SOT-23-5 surface-mount package and supports operation across a temperature range of -40°C to +125°C.

Feature Summary

• Integrated electronic switch for shutdown control using standard logic levels
• Low noise performance suitable for sensitive analog circuits
• Compact SOT-23-5 surface-mount packaging for space-constrained designs

Applications

• Portable battery-powered equipment requiring stable low-voltage rails
• RF modules and communication devices needing low-noise power supplies
• Embedded systems utilizing microcontrollers with logic-level shutdown requirements

Procurement Notes

Verify the specific suffix (e.g., TR) matches the required reel quantity and tape specifications for automated assembly lines. Confirm that the 2.7V fixed output aligns precisely with the target circuit's voltage tolerance requirements. Ensure the SOT-23-5 footprint matches the PCB design guidelines provided in the official datasheet to prevent soldering defects during reflow processes.

Selection Notes

Select this component when a fixed 2.7V rail is necessary alongside active power management capabilities. The built-in shutdown feature eliminates the need for external switching transistors, simplifying the schematic. Consider the thermal dissipation characteristics of the SOT-23-5 package under maximum load conditions to ensure reliable operation within the specified ambient temperature range without exceeding junction limits.

Part Context

This part belongs to the LK112 series of low-dropout regulators designed for portable electronics. The series offers various fixed output voltages while maintaining consistent electrical characteristics such as low quiescent current and high line/load regulation. The inclusion of a shutdown pin distinguishes it from standard LDOs, allowing for direct integration into systems requiring efficient power conservation modes.

Replacement Considerations

Direct substitutes include other LK112 variants with different fixed output voltages, such as the LK112M18TR (1.8V) or LK112SM18TR, provided the system voltage requirement changes. Cross-brand replacements must match the 150 mA output current, SOT-23-5 package, and logic-compatible shutdown functionality to maintain circuit compatibility.