LD39020ADTPU30R

Overview

The LD39020ADTPU30R is a high-accuracy linear voltage regulator from STMicroelectronics, delivering a fixed 3V output with a maximum current of 200mA. It operates within an input voltage range of 1.5V to 5.5V and features a typical dropout voltage of 200mV at full load. The device incorporates very low quiescent current consumption of 20µA at no load and less than 0.1µA in shutdown mode. It includes internal soft-start, constant current limiting, and thermal protection. The component utilizes a compact 4-DFN (1x1mm) surface-mount package and maintains stability with a 0.47µF ceramic output capacitor.

Feature Summary

• Ultra-low dropout voltage operation ensures efficient power delivery under varying load conditions.
• Logic-controlled electronic shutdown enables deep sleep states for extended battery life.
• Internal soft-start circuit limits inrush current during power-up sequences.
• Integrated overcurrent and thermal protection safeguards the device against fault conditions.

Applications

• Low-power battery-operated portable electronics
• Smartphone and tablet power management systems
• Wearable device voltage regulation

Procurement Notes

Verify the specific suffix '30R' confirms the 3V fixed output variant when sourcing. Confirm the 'A' designation indicates the ±0.5% output voltage tolerance version rather than the standard ±2.0% tolerance. Ensure the procurement order specifies the tape-and-reel packaging format compatible with automated assembly lines. Cross-reference the manufacturer part number directly with official datasheets to avoid confusion with similar LDO families.

Selection Notes

Select this component for designs requiring minimal footprint and high precision in space-constrained environments. The 4-DFN package offers significant area savings compared to traditional SOT packages. Choose this regulator where low noise and high PSRR are critical for sensitive analog circuits. Verify that the application input voltage remains within the 1.5V to 5.5V operational window to ensure stable regulation.

Part Context

This part belongs to the LD39020 family of ultra-low dropout linear regulators designed for mobile and handheld applications. The family shares common features such as low quiescent current and ceramic capacitor compatibility. Variants differ primarily by output voltage and tolerance accuracy. The DFN4 1x1 package is a standard form factor across the series, facilitating consistent board layout strategies for multiple voltage rails.

Replacement Considerations

Direct substitutes include other LD39020 variants with different fixed output voltages, such as LD39020ADTPU08R for 0.8V output requirements. Ensure any replacement maintains the same 4-DFN pinout and electrical characteristics if a voltage change is not intended. Verify that alternative components support the required 200mA output current and meet the specific ±0.5% tolerance specification.