LD39020ADTPU25R

Overview

The LD39020ADTPU25R is a fixed-output linear regulator IC manufactured by STMicroelectronics. It provides a fixed output voltage of 2.5 V with a maximum continuous output 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. Quiescent current is specified at 40 µA, with shutdown consumption below 0.1 µA when enabled. Power supply rejection ratio (PSRR) reaches 80 dB at 1 kHz and 55 dB at 100 kHz. Output voltage tolerance for the 'A' version is ±0.5% at 25 °C. It utilizes a 4-DFN (1x1 mm) package with exposed pad.

Feature Summary

• Ultra-low dropout voltage operation ensures efficient power delivery under varying load conditions.
• Logic-controlled enable pin allows deep shutdown mode with minimal standby current consumption.
• Integrated soft-start circuit limits inrush current during power-up sequences.
• Internal thermal and constant current protection safeguards against overload and overheating.

Applications

• Low-power battery-operated portable electronic devices
• Space-constrained embedded systems requiring small footprint regulators
• Noise-sensitive analog circuits requiring high PSRR performance

Procurement Notes

Verify the specific suffix 'A' indicates the high-accuracy ±0.5% output voltage tolerance variant compared to standard versions. Confirm the 'DTPU' designation corresponds to the 4-DFN 1x1mm package with exposed thermal pad. Ensure ordering quantities align with manufacturer reel specifications. Validate RoHS compliance status for the specific production batch prior to integration.

Selection Notes

Select this component when strict space limitations require a 1x1 mm package size alongside low quiescent current requirements. The high accuracy variant is suitable for precision applications where tight output voltage tolerances are critical. Consider the input voltage range compatibility with the system's power source. Evaluate thermal dissipation needs based on the junction temperature rating and PCB copper area available for heat spreading.

Part Context

This part belongs to the LD39020 family of ultra-low quiescent current linear regulators designed for mobile and handheld applications. The family offers various fixed output voltages and packages, including SOT23-5L. The 'A' suffix distinguishes it from standard tolerance parts, providing tighter voltage accuracy. It complements other PMIC solutions by offering simple discrete regulation with minimal external components.

Replacement Considerations

LD39020DTPU25R: Standard tolerance version with ±2.0% accuracy instead of ±0.5%. LD39020ADTPU21R: Same accuracy and package but fixed 2.1 V output. Verify package compatibility and output voltage requirements before substitution.