LD39020ATPU33R

Overview

The LD39020ATPU33R is a fixed-output linear regulator IC from STMicroelectronics, providing a stable 3.3 V output with a maximum current of 200 mA. It operates within an input voltage range of 1.5 V to 5.5 V and features a typical dropout voltage of 200 mV at full load. The device exhibits a very low quiescent current of 40 µA and supports high power supply rejection ratios of 80 dB at 1 kHz. Designed for surface mount applications, it utilizes a compact 4-DFN (1x1 mm) package and functions reliably across a junction temperature range of -40 °C to +125 °C.

Feature Summary

• Logic-controlled electronic shutdown enables ultra-low standby consumption
• Internal soft-start circuit limits inrush current during startup
• Integrated overcurrent and thermal protection safeguards operation

Applications

• Low-power battery-operated equipment
• Smartphones and tablets
• Wearable devices

Procurement Notes

Verify the specific suffix 'A' indicates the ±0.5% output voltage tolerance variant rather than the standard ±2.0% version. Confirm the 4-DFN package dimensions match the design footprint requirements. Ensure compatibility with ceramic output capacitors as specified in the official datasheet.

Selection Notes

Select this component when precise output voltage accuracy is critical due to its tighter tolerance specification compared to standard variants. The small DFN4 footprint makes it suitable for space-constrained designs requiring efficient power management without sacrificing regulation performance.

Part Context

This part belongs to the LD39020 series of ultra-low dropout regulators designed for portable electronics. It shares core architectural features with other members but offers enhanced voltage accuracy. The series emphasizes minimal external component count and low noise for sensitive analog circuits.

Replacement Considerations

LD39020TPU33R: Standard version with ±2.0% tolerance instead of ±0.5%. STEVAL-ISB037V1: Evaluation board only, not a direct replacement.