LDK120M-R

Overview

The LDK120M-R is a positive adjustable low-dropout linear regulator manufactured by STMicroelectronics, housed in a SOT-23-5 surface-mount package. It delivers a maximum output current of 200 mA with an input voltage range spanning from 1.9 V to 5.5 V. The device supports an adjustable output voltage configuration ranging from 0.8 V up to the input voltage minus the dropout voltage. Key electrical specifications include a maximum quiescent current of 60 µA and a typical dropout voltage of 0.3 V at full load. It features a power supply rejection ratio of 55 dB within the 120 Hz to 10 kHz frequency band.

Feature Summary

• Logic-controlled electronic shutdown function enables deep sleep mode with ultra-low standby consumption
• Integrated constant-current limiting and thermal protection mechanisms ensure robust operation under fault conditions
• Designed for stability when paired with small-value ceramic output capacitors

Applications

• Battery-powered portable electronics requiring extended operational life
• Low-noise analog circuit power supplies
• Embedded systems utilizing logic-controlled power sequencing

Procurement Notes

Verify the specific suffix against official datasheets to confirm pinout compatibility and thermal characteristics. Ensure that the ordering information matches the exact package variant required for your PCB layout. Cross-reference the manufacturer's latest documentation to confirm active status and any potential lifecycle changes before finalizing procurement plans.

Selection Notes

Select this component when designing circuits that demand minimal static current draw alongside high efficiency at moderate load currents. The adjustable output capability allows for precise voltage tailoring without external resistors if fixed variants are unavailable. Consider the thermal dissipation limits inherent to the small SOT-23-5 footprint during high-load operations.

Part Context

This part belongs to the LDK120 series of low-dropout regulators designed for space-constrained applications. The series emphasizes low noise and low quiescent current performance. The M-R suffix specifically denotes the SOT-23-5 packaging format, distinguishing it from other physical form factors available within the same functional family.

Replacement Considerations

Consult official substitution lists for verified equivalents. Direct replacements must match the SOT-23-5 package and maintain comparable current and voltage ratings.