LDLN025PU18R

Overview

The LDLN025PU18R is a fixed-output linear low-dropout regulator from STMicroelectronics, providing a stable 1.8V output with a maximum load current of 250mA. It operates within an input voltage range of 1.5V to 5.5V and features a typical dropout voltage of 120mV at full load. The device incorporates ultra-low quiescent current of 25µA and logic-controlled shutdown consuming less than 1µA. It includes internal protections against overcurrent, thermal overload, and short circuits, alongside soft-start functionality.

Feature Summary

• Ultra-low noise performance suitable for sensitive RF and analog loads
• High power supply rejection ratio across wide frequency ranges
• Logic-controlled enable pin for efficient power management
• Integrated thermal and overcurrent protection mechanisms

Applications

• Powering voltage controlled oscillators in mobile devices
• Supplying precision analog-to-digital converters
• Biasing sensors in wireless IoT modules
• Noise-sensitive sections in portable electronics

Procurement Notes

Verify the specific package variant, as the PU suffix denotes a 4-DFN configuration. Confirm RoHS3 compliance status directly with the manufacturer or authorized distributors. Ensure the ordering code matches the required output voltage tolerance and packaging format before finalizing procurement orders.

Selection Notes

Select this component when ultra-low noise and high PSRR are critical for signal integrity. It is optimal for battery-powered systems requiring extended standby life due to its minimal quiescent current. Consider the 4-DFN footprint constraints during PCB layout design to ensure adequate thermal dissipation and solder joint reliability.

Part Context

This part belongs to the LDLN025 series of 250mA LDO regulators designed for space-constrained applications. The series offers various fixed output voltages and package options including SOT-23-5 and Flip-Chip. It targets markets demanding high performance in small form factors, such as wearables and smartphones.

Replacement Considerations

LDLN025J18R (Flip-Chip package) and LDLN025M18R (SOT-23-5 package) offer identical electrical specifications with different physical footprints.