LD39020DTPU47R

Overview

The LD39020DTPU47R is a fixed-output linear voltage regulator from STMicroelectronics, providing a nominal output of 4.7 V with a maximum current capability 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 incorporates a logic-controlled enable pin for electronic shutdown, reducing standby current to below 0.1 µA. Internal protections include thermal shutdown and constant current limiting. It utilizes a DFN4 1x1 package and requires a minimum ceramic output capacitor of 0.47 µF for stability.

Feature Summary

• Ultra-low dropout voltage operation ensures efficient power delivery under varying load conditions.
• Logic-controlled electronic shutdown enables deep sleep modes with minimal current consumption.
• Integrated soft-start circuit manages inrush currents during startup without external components.
• Internal discharge MOSFET rapidly removes charge from the output capacitor upon disable.

Applications

• Mobile phones
• Tablets
• Digital still cameras (DSC)
• Cordless phones and similar battery-powered systems
• Portable media players

Procurement Notes

Verify the specific suffix 'DT' indicates the inclusion of the auto-discharge feature on the output pin. Confirm the package type matches the required footprint, as this part number corresponds to the DFN4 1x1 configuration. Ensure the ordering code aligns with the desired tolerance level, which is specified as 2% for this standard version. Cross-reference the manufacturer's latest datasheet revision to confirm any updates to electrical characteristics or mechanical dimensions before finalizing procurement.

Selection Notes

Select this component when a precise 4.7 V rail is required from a single-cell lithium-ion or similar battery source. The low quiescent current makes it suitable for extending battery life in portable devices. Verify that the application load does not exceed the 200 mA limit and that the input voltage remains within the 1.5 V to 5.5 V operational window. Consider the thermal resistance of the DFN4 1x1 package if high ambient temperatures are expected.

Part Context

This device belongs to the LD39020 family of high-accuracy voltage regulators designed for space-constrained applications. The family offers various fixed output voltages ranging from 0.8 V to 5.0 V. The 'D' suffix typically denotes the version with the integrated output discharge function, while the 'T' indicates tape and reel packaging. The series is optimized for low noise and high power supply rejection ratio performance.

Replacement Considerations

LD39020ADTPU47R provides the same functionality but with tighter ±0.5% output voltage tolerance compared to the standard ±2% version.

FAQ

What is the purpose of the EN pin?

The EN pin serves as a logic-controlled enable input. Driving it high activates the regulator, while driving it low puts the device into shutdown mode, reducing current consumption significantly.

Is an external capacitor required for stability?

Yes, the device requires a ceramic output capacitor. A minimum capacitance of 0.47 µF is recommended to ensure stability across all operating conditions, including temperature and load variations.