LDK120C15R

Overview

The LDK120C15R is a low-dropout linear voltage regulator manufactured by STMicroelectronics, designed for low-power battery-operated applications. It provides a fixed output voltage of 1.5 V with a maximum output current of 200 mA. The device operates within an input voltage range of 1.9 V to 5.5 V and features a typical dropout voltage of 100 mV at a 100 mA load. Quiescent current is maintained at a maximum of 100 μA, reducing to less than 1 μA in shutdown mode. It utilizes a SOT-323-5L surface-mount package and supports operation across a temperature range from -40 °C to +125 °C.

Feature Summary

• Ultra-low dropout voltage capability ensures efficient power regulation under varying load conditions.
• Logic-controlled electronic shutdown function minimizes total current consumption during inactive periods.
• Integrated short-circuit constant current limiting and thermal protection safeguard the device against fault conditions.

Applications

• Low-power battery-operated portable devices
• DSP and MCU power supply rails
• FPGA core voltage regulation

Procurement Notes

Verify the specific suffix 'C15' confirms the fixed 1.5 V output variant rather than the adjustable version. Confirm the 'R' suffix indicates reel packaging if tape-and-reel handling is required. Ensure the SOT-323-5L package matches the PCB footprint design. Cross-reference the RoHS compliance status with the latest manufacturer documentation before finalizing procurement.

Selection Notes

Select this component when a stable 1.5 V rail is required from a 1.9 V to 5.5 V source. The low quiescent current makes it suitable for energy-constrained systems. Verify that the application requires a fixed voltage rather than an adjustable one. Ensure the load current does not exceed 200 mA continuously. Check that the operating environment stays within the specified -40 °C to +125 °C range.

Part Context

This part belongs to the LDK120 series of ultra-low-dropout regulators. The series offers various fixed output voltages and an adjustable version. It shares common features like low noise and ceramic capacitor stability with other members of the family but differs in its specific output voltage setting and package options.

Replacement Considerations

Check for direct substitutes within the LDK120 series offering different fixed voltages or packages. Verify compatibility with existing circuit designs if replacing with adjustable variants. Ensure thermal performance remains adequate under similar load conditions.