LDLN025PU29R

Overview

The LDLN025PU29R is a fixed-output low-dropout linear regulator from STMicroelectronics, providing a precise 2.9 V output voltage 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 incorporates logic-controlled shutdown for power management, achieving less than 1 µA standby current. It includes internal protections against overcurrent and thermal overload, ensuring reliable operation across a temperature range of -40 °C to +125 °C.

Feature Summary

• Ultra-low output noise suitable for sensitive RF and analog loads
• Logic-controlled electronic shutdown for extended battery life
• High power supply rejection ratio (PSRR) for clean signal integrity
• Integrated short-circuit and thermal protection mechanisms

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 and IoT modules

Procurement Notes

Verify the specific suffix PU29R confirms the 2.9 V fixed output voltage and DFN-4 package configuration. Ensure compatibility with ceramic output capacitors as required for stability. Confirm that the ordering code matches the exact pinout and thermal pad requirements for your PCB layout design.

Selection Notes

Select this component when designing space-constrained portable electronics requiring high PSRR and minimal quiescent current. It is optimal for applications where maintaining stable voltage under varying load conditions is critical. Consider the 2.9 V fixed output if it aligns directly with the target circuit's rail requirements without needing external adjustment resistors.

Part Context

This part belongs to the LDLN025 series of 250 mA ultra-low noise LDO regulators. The series is engineered for noise-sensitive loads in compact form factors such as smartphones and medical sensors. It shares common family features including flip-chip and DFN packaging options and advanced thermal protection architectures.

Replacement Considerations

Cross-reference with other LDLN025 variants offering different fixed output voltages or alternative packages like SOT-23-5L. Verify that substitute parts maintain the same 250 mA current rating and 6.5 µVRMS noise specification to ensure functional equivalence in sensitive RF designs.