LD39030DTPU18R

Overview

The LD39030DTPU18R is a fixed-output low-dropout linear regulator from STMicroelectronics, providing a stable 1.8 V output with a maximum load current of 300 mA. It operates within an input voltage range of 1.5 V to 5.5 V and features a typical dropout voltage of 300 mV at full load. The device exhibits a very low quiescent current of 20 µA and achieves high power supply rejection ratios of 80 dB at 1 kHz. Integrated protections include thermal shutdown and constant current limiting, while an enable pin allows for electronic shutdown with consumption below 0.1 µA.

Feature Summary

• Ultra-low dropout voltage capability ensures efficient regulation under minimal headroom conditions
• Logic-controlled enable function facilitates deep sleep modes for extended battery life
• Internal soft-start circuit limits inrush current during power-up sequences
• Compatible with small ceramic output capacitors for compact board layouts

Applications

• Low-power portable consumer electronics requiring stable voltage rails
• Battery-operated devices where minimizing quiescent current is critical
• Embedded systems utilizing microcontrollers or sensors needing precise 1.8 V logic levels
• Space-constrained designs utilizing the DFN4 package footprint

Procurement Notes

Verify the specific suffix '18R' confirms the 1.8 V fixed output variant, as the LD39030 series offers multiple voltage options. Ensure compatibility with standard 4-DFN (1x1 mm) footprints during PCB layout. Confirm RoHS compliance status through official manufacturer documentation prior to final procurement decisions.

Selection Notes

Select this component when a fixed 1.8 V rail is required with minimal static power draw. The LD39030 series is suitable for applications demanding high PSRR and fast transient response. Consider the 300 mA current limit against peak load requirements. The DFN4 package is ideal for dense surface-mount assemblies compared to larger traditional packages.

Part Context

This part belongs to the LD39030 family of ultra-low quiescent current linear regulators designed for space-saving and energy-efficient applications. The series utilizes a 4-DFN 1x1 mm package to minimize board area. It complements other PMIC solutions by offering simple external component requirements and robust protection features for sensitive analog and digital loads.

Replacement Considerations

Cross-reference with other LD39030 variants such as LD39030DTPU33R for different voltage needs. Verify pinout compatibility if substituting with similar LDOs from other manufacturers. Ensure thermal performance remains adequate under the new operating conditions.