LD39020ADTPU11R

Overview

The LD39020ADTPU11R is a low-dropout linear regulator IC manufactured by STMicroelectronics. It provides a fixed output voltage of 1.1 V with a maximum load current of 200 mA. The device operates from an input voltage range of 1.5 V to 5.5 V and features a typical dropout voltage of 200 mV at full load. It incorporates a very low quiescent current of 20 µA and achieves high power supply rejection ratio (PSRR) values of 80 dB at 1 kHz and 55 dB at 100 kHz. The component utilizes a 4-DFN (1x1 mm) surface-mount package and includes internal protections such as overcurrent limiting, thermal shutdown, and soft-start functionality.

Feature Summary

• Ultra-low dropout voltage operation for efficient battery-powered applications
• Logic-controlled enable function for deep shutdown mode with minimal current consumption
• High power supply rejection ratio to maintain stable output under noisy conditions
• Integrated protection mechanisms including thermal shutdown and constant current limiting

Applications

• Low-power portable electronic devices requiring extended battery life
• Battery-operated sensor nodes in IoT networks
• Power management sections in mobile communication equipment
• Embedded systems utilizing ceramic output capacitors for space efficiency

Procurement Notes

Verify the specific suffix 'A' indicates the ±0.5% output voltage tolerance version rather than the standard ±2.0% variant. Confirm the 'DTPU' designation corresponds to the 4-DFN 1x1 mm package with exposed pad. Ensure the trailing 'R' denotes tape-and-reel packaging suitable for automated assembly processes. Cross-reference the manufacturer part number against official STMicroelectronics documentation to validate authenticity and revision status before integration into production designs.

Selection Notes

Select this component when precise output voltage accuracy is critical due to its tighter tolerance specification compared to standard versions. Consider the 4-DFN package dimensions if board real estate is constrained. Evaluate the 200 mA current capability against peak load requirements to ensure adequate headroom. Verify compatibility with available ceramic output capacitance values to guarantee stability without requiring additional external components.

Part Context

This regulator belongs to the LD39020 family of ultra-low quiescent current linear regulators designed for space-constrained, battery-driven applications. The family offers various fixed output voltages ranging from 0.8 V to 5.0 V in 50 mV steps. The LD39020 series is characterized by its ability to operate with small ceramic capacitors, simplifying design and reducing overall system footprint while maintaining high performance in portable electronics.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material.