LDLN025PU275R

Overview

The LDLN025PU275R is a fixed-output low-dropout linear regulator from STMicroelectronics, providing a precise 2.75 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 µVRMS. The device utilizes a compact Flip-Chip4 package for surface-mount applications. Key electrical characteristics include a typical dropout voltage of 120 mV at full load and a very low quiescent current of 12 µA under no-load conditions. It incorporates logic-controlled shutdown functionality, internal soft-start, and comprehensive protection against overcurrent and thermal overload.

Feature Summary

• Ultra-low output noise suitable for sensitive RF and analog loads
• Logic-controlled electronic shutdown for extended battery life
• Internal soft-start limits inrush current during power-up
• High power supply rejection ratio for clean signal integrity

Applications

• Voltage regulation for precision Analog-to-Digital Converters (ADCs)
• Power supply for Voltage-Controlled Oscillators (VCOs) in mobile devices
• Noise-sensitive circuits in wireless LAN equipment
• Battery-powered IoT sensors requiring minimal standby current

Procurement Notes

Verify the specific suffix PU275R to confirm the 2.75 V fixed output voltage and Flip-Chip4 packaging configuration. Ensure compatibility with standard reflow soldering profiles for flip-chip components. Cross-reference the manufacturer's latest datasheet to validate pinout assignments and recommended external capacitor values for stability.

Selection Notes

Select this component when designing space-constrained systems requiring high line and load regulation accuracy. It is optimal for applications where maintaining signal purity in ADCs or VCOs is critical. Consider its low quiescent current for portable devices, but verify that the 250 mA output capability meets the peak load requirements of the target circuit design.

Part Context

This part belongs to the LDLN025 series of ultra-low noise LDO regulators designed for noise-sensitive loads. The series offers various fixed output voltages and multiple small form-factor packages, including DFN and SOT-23 options. It targets consumer electronics and wearable technology markets where power efficiency and signal integrity are paramount constraints.

Replacement Considerations

Check for other LDLN025 variants with different output voltages or package types if the 2.75 V setting is not required. Verify pinout compatibility before substituting with other manufacturers' 250 mA LDOs, as interface definitions may differ.