LDLN025PU25R

Overview

The LDLN025PU25R is a fixed-output low-dropout linear regulator from STMicroelectronics, providing a stable 2.5 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 quiescent current of 12 μA at no-load. The device delivers high performance with an output noise of less than 6.5 μVrms and power supply rejection ratios of 80 dB at 100 Hz and 60 dB at 100 kHz. Dropout voltage is typically 120 mV at full load. It includes logic-controlled shutdown, internal soft-start, and thermal/overcurrent protection, operating across a junction temperature range of -40 °C to +125 °C.

Feature Summary

• Ultra-low noise operation suitable for sensitive RF and analog loads
• Very low quiescent current extends battery life in standby modes
• High power supply rejection ratio ensures clean output under varying conditions
• Integrated protection mechanisms including thermal shutdown and overcurrent limiting

Applications

• Powering precision analog-to-digital converters (ADCs)
• Supplying voltage control oscillators (VCOs) in mobile devices
• Powering wireless LAN modules and IoT sensors
• Providing clean power for medical sensors and fitness monitors

Procurement Notes

Verify the specific suffix PU25R against official datasheets to confirm the 2.5 V fixed output and DFN-4 package configuration. Ensure compatibility with required ceramic output capacitors for stability. Check for end-of-life notices or alternative recommendations from STMicroelectronics as availability may vary.

Selection Notes

Select this component when ultra-low noise and minimal static current are critical for battery-operated portable electronics. It is appropriate for designs requiring high PSRR to isolate sensitive circuits from supply line noise. Consider the small footprint and available packages if space constraints are a primary design factor.

Part Context

This part belongs to the LDLN025 series, a family of 250 mA ultra-low noise LDO regulators designed by STMicroelectronics. The series targets applications demanding high signal integrity and extended battery life, such as smartphones, tablets, and wearable health devices. It complements other PMIC solutions by offering specialized noise performance in a compact form factor.

Replacement Considerations

Consult STMicroelectronics documentation for direct pin-compatible alternatives within the LDLN025 series that offer different output voltages or package types. Verify electrical parameter equivalence before substituting with components from other manufacturers.