LDK120C-R

Overview

The LDK120C-R is a positive adjustable linear low-dropout regulator (LDO) manufactured by STMicroelectronics, housed in a SOT-323-5 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 ranging from 0.8 V up to VIN minus the dropout voltage. Key electrical specifications include a typical dropout voltage of 100 mV at 100 mA load, a maximum quiescent current of 100 µA, and a shutdown mode current consumption below 1 µA. It operates within a temperature range of -40°C to +125°C.

Feature Summary

• Ultra-low dropout voltage performance ensures efficient regulation under varying load conditions.
• Low quiescent current and logic-controlled electronic shutdown minimize power consumption in battery-operated systems.
• Integrated constant current limiting and thermal protection safeguard against short circuits and overheating.
• Stable operation is maintained using standard ceramic capacitors on the output.

Applications

• Low-power battery-powered consumer electronics
• Always-on automotive body and interior functions
• Industrial applications requiring stable DC rails

Procurement Notes

Verify the specific suffix 'C' against the manufacturer's official documentation to confirm pinout compatibility and functional equivalence before integration. Ensure that the selected packaging format aligns with automated assembly requirements. Confirm RoHS compliance status for environmental regulations. Cross-reference the latest datasheet revision to validate parameter tolerances and ensure design consistency with current manufacturing standards.

Selection Notes

Select this component when designing circuits that require precise voltage regulation with minimal power loss across the pass element. The adjustable output feature allows flexibility in setting specific voltage levels required by downstream loads. Consider the thermal characteristics and package size constraints when determining suitability for space-limited designs. Evaluate the noise performance requirements to ensure the low-noise characteristic meets the sensitivity needs of the application.

Part Context

This part belongs to the LDK120 series of ultra-low dropout voltage regulators produced by STMicroelectronics. The series includes variants offering different current capabilities, such as the LDK130 which provides 300 mA. These regulators are engineered for high efficiency and low noise, targeting modern portable and industrial applications where power conservation and signal integrity are critical design parameters.

Replacement Considerations

Consult the official LDK120xx datasheet for confirmed substitute part numbers or alternative packages within the same family. Verify that any replacement maintains identical pin configurations and electrical specifications to ensure seamless integration without circuit redesign.