LDLN050PUR

Overview

The LDLN050PUR is a high-performance, low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides a fixed output current of 500 mA and operates within an input voltage range of 2.7 V to 6.5 V. The device features ultra-low output noise of 13 µV RMS/VOUT and a typical quiescent current of 48 µA. It offers a high power supply rejection ratio (PSRR) of 65 dB at 100 Hz and a fast startup time of 50 µs. The maximum dropout voltage is 190 mV at full load. It is housed in a DFN8 package measuring 3 x 3 mm and supports operation from -40 °C to 125 °C.

Feature Summary

• Ultra-low output noise design suitable for noise-sensitive circuits
• Fast dynamic performance with rapid startup characteristics
• Low static current consumption for battery-powered applications
• Integrated protection against overcurrent, thermal overload, and short circuits

Applications

• Powering sensors in industrial environments
• Supplying microcontrollers (MCUs)
• Powering wireless integrated circuits

Procurement Notes

Verify the specific suffix 'PUR' against the official datasheet to confirm package type and tape-and-reel configuration. Confirm RoHS compliance status as specified in the latest documentation. Ensure the required external capacitor meets the minimum equivalent series resistance (ESR) requirement of 2 µF for stability. Check for any product change notices or end-of-life announcements prior to finalizing procurement plans.

Selection Notes

Select this component when a stable 500 mA output is required for sensitive analog or RF loads. The low noise profile makes it appropriate for precision measurement systems. Verify that the input voltage remains within the 2.7 V to 6.5 V range. Consider the thermal dissipation capabilities of the DFN8 package based on the ambient temperature and load conditions.

Part Context

This part belongs to the LDLN050 series of low-dropout regulators designed for high-performance applications. The series utilizes a PMOS pass element to achieve low impedance and fast response times. It is engineered to provide clean power to critical components in space-constrained designs while maintaining efficiency through low quiescent current draw.

Replacement Considerations

Consult the manufacturer's cross-reference guide for verified substitutes. Ensure any replacement maintains the 500 mA output capability, 5 V fixed output, and compatible DFN8 footprint. Verify that alternative devices meet the same noise and PSRR specifications for sensitive circuit compatibility.