LDLN050PU25R

Overview

The LDLN050PU25R is a fixed-output low-dropout linear regulator from the LDLN050 series, manufactured by STMicroelectronics. It provides a stable 2.5 V output with a maximum continuous current of 500 mA. The device operates within an input voltage range of 2.7 V to 6.5 V and features ultra-low output noise of 13 µV RMS. Key electrical parameters include a typical quiescent current of 48 µA, high power supply rejection ratio (PSRR) of 65 dB at 100 Hz, and a maximum dropout voltage of 190 mV at full load. It supports fast startup times of approximately 50 µs and includes internal thermal and overcurrent protection.

Feature Summary

• Ultra-low noise design suitable for sensitive analog and RF circuits
• High power supply rejection ratio for clean power delivery
• Low quiescent current for battery-powered applications
• Integrated thermal and overcurrent protection

Applications

• Noise-sensitive industrial sensor circuits
• Microcontroller unit (MCU) power supplies
• Wireless integrated circuit (IC) power regulation
• Battery-operated portable devices

Procurement Notes

Verify the specific suffix PU25R against the official datasheet to confirm the fixed 2.5 V output voltage and package type. Ensure compatibility with the required PCB footprint for the DFN8 (3x3 mm) package. Confirm RoHS compliance status and check for any recent product change notices or lifecycle updates directly from the manufacturer before finalizing procurement plans.

Selection Notes

Select this component when ultra-low noise performance is critical for downstream analog or RF sections. The 500 mA output capability supports moderate load requirements while maintaining efficiency through low dropout characteristics. Consider the 48 µA quiescent current for standby power budgets in portable electronics. Verify that the minimum input voltage of 2.7 V aligns with the system's available supply rails under all operating conditions.

Part Context

This part belongs to the LDLN050 family of high-performance LDO regulators designed for industrial and consumer applications. The series utilizes a PMOS pass element to achieve fast transient response and low dropout voltage. The LDLN050PU25R specifically offers a fixed 2.5 V output, distinguishing it from adjustable variants or other fixed voltage options within the same package and current rating family.

Replacement Considerations

Direct replacements within the same series include other fixed voltage variants such as LDLN050PU18R (1.8 V) or LDLN050PU33R (3.3 V), provided the system voltage requirement differs. Cross-series alternatives like the LDLN025 offer lower current capacity (250 mA) but similar noise profiles. Verify pinout and thermal pad connectivity when substituting with different packages.