LK112SM15TR

Overview

The LK112SM15TR is a low-dropout linear voltage regulator manufactured by STMicroelectronics, featuring a fixed 1.5V output and a maximum continuous load current of 200 mA. It operates within an input voltage range of 2.5 V to 14 V and utilizes a SOT-23-5 surface-mount package. The device exhibits a maximum dropout voltage of 500 mV at full load and maintains a quiescent current of up to 250 μA in the ON state. It provides a voltage regulation accuracy of ±2% at 25 °C and includes internal thermal shutdown and overcurrent protection mechanisms.

Feature Summary

• Integrates a shutdown function controllable via TTL or CMOS logic levels for power management
• Features a dedicated noise bypass pin allowing external capacitor connection to reduce output noise
• Includes internal thermal shutdown and short-circuit protection to safeguard the device under fault conditions

Applications

• Battery-powered portable electronic devices requiring efficient power regulation
• Low-noise analog circuits sensitive to supply ripple
• Embedded systems utilizing microcontrollers with specific low-voltage requirements

Procurement Notes

Verify the exact suffix against official STMicroelectronics documentation to confirm the specific output voltage variant, as the base part number may cover multiple voltage options. Ensure the ordering code matches the required reel quantity and packaging format specified in the manufacturer's datasheet. Cross-reference the component marking with the official product identification guide to prevent counterfeit parts.

Selection Notes

Select this component when a stable 1.5V supply is required from inputs ranging between 2.5V and 14V. Consider the SOT-23-5 package constraints for PCB layout and thermal dissipation. Evaluate the 250 μA quiescent current against system standby requirements. Verify that the 200 mA output capability meets the peak load demands of the target application circuit.

Part Context

This component belongs to the LK112S series of low-noise low-dropout regulators. The series is characterized by its ability to operate with very low quiescent currents and its inclusion of a shutdown control pin. The family supports various fixed output voltages, catering to diverse digital and analog logic families in compact surface-mount applications.

Replacement Considerations

Consult the official STMicroelectronics replacement matrix for verified cross-references. Ensure any substitute maintains the SOT-23-5 footprint and compatible electrical characteristics, specifically the 1.5V output and 200 mA current rating.