LDLN025PU30R

Overview

The LDLN025PU30R is a 250 mA low-dropout linear regulator from STMicroelectronics, providing a fixed 3.0 V output. It operates within an input voltage range of 1.5 V to 5.5 V and features ultra-low noise performance with a typical output noise of 6.5 µVRMS. The device maintains high power supply rejection ratios of 80 dB at 100 Hz and 60 dB at 100 kHz. Quiescent current is minimized to 12 µA at no-load, extending battery life in portable applications. It includes logic-controlled shutdown, internal soft-start, and thermal/overcurrent protection, housed in a compact Flip-Chip4 package.

Feature Summary

• Ultra-low noise operation suitable for sensitive RF and analog loads
• High power supply rejection ratio ensures clean output under varying conditions
• Logic-controlled enable pin allows deep shutdown with minimal current consumption
• Integrated safety features including thermal and overcurrent protection

Applications

• Noise-sensitive loads such as precision ADCs and sensors
• Voltage control oscillators (VCOs) in mobile phones and tablets
• Wireless LAN devices and wireless IoT modules
• Space-constrained consumer electronics like smartwatches and fitness monitors

Procurement Notes

Verify the complete part number against official STMicroelectronics documentation to ensure correct suffix alignment. Confirm that the PU30R designation corresponds specifically to the 3.0 V fixed output variant and the Flip-Chip4 packaging. Cross-reference the manufacturer's latest datasheet to validate active status and any potential obsolescence notices before finalizing procurement plans.

Selection Notes

Select this component when designing for ultra-sensitive analog or RF circuits requiring minimal output noise and high PSRR. It is appropriate for battery-powered systems where low quiescent current and extended standby times are critical. Ensure the application requires a fixed 3.0 V output and fits within the 1.5 V to 5.5 V input range. Consider the Flip-Chip4 package constraints for PCB layout and thermal management requirements.

Part Context

This device belongs to the LDLN025 series of low-dropout regulators designed for noise-sensitive applications. The series offers various fixed output voltages ranging from 1.0 V to 5.0 V in 50 mV steps. It is engineered for space-constrained products, providing stable regulation with ceramic capacitors only. The series emphasizes low power consumption and high performance in small form factors.

Replacement Considerations

Consult STMicroelectronics official substitution guides for verified alternatives. Do not assume functional equivalence with other LDO families without verifying electrical parameters and pin compatibility.