LDLN025J18R

Overview

The LDLN025J18R is a fixed-output low-dropout linear voltage regulator from STMicroelectronics, providing a stable 1.8 V output with a maximum load current of 250 mA. It operates within an input voltage range of 1.5 V to 5.5 V and features ultra-low noise performance at 6.5 μV RMS. The device includes logic-controlled shutdown, internal soft-start, and overcurrent/thermal protection. Packaged in a compact Flip-Chip-4 format, it maintains stability using ceramic capacitors.

Feature Summary

• Ultra-low noise operation suitable for sensitive RF and analog loads
• Logic-controlled electronic shutdown for extended battery life
• Integrated safety protections including thermal and short-circuit limits

Applications

• Powering Voltage Controlled Oscillators (VCOs) in mobile devices
• Supplying precision Analog-to-Digital Converters (ADCs)
• Noise-sensitive wireless LAN components

Procurement Notes

Verify the specific suffix 'J' indicates the 1.8 V fixed output variant and 'R' denotes the tape-and-reel packaging configuration. Confirm the package type matches the required Flip-Chip footprint. Check for active status or obsolescence notices as distribution availability may vary.

Selection Notes

Select this component when designing for space-constrained portable electronics requiring clean power rails. Ensure the input voltage remains within the specified 1.5 V to 5.5 V range. Verify that the PCB layout supports the Flip-Chip-4 thermal dissipation requirements for the target operating temperature.

Part Context

This part belongs to the LDLN025 series of 250 mA ultra-low noise LDO regulators designed for smartphones, smartwatches, and IoT sensors. The series offers multiple fixed output voltages and package options to support diverse portable application needs while maintaining high power supply rejection ratios.

Replacement Considerations

LD56020J180R is listed as a substitute option by distributors.