LD39100PU12RY

Overview

The LD39100PU12RY is a fixed-output low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides a fixed output voltage of 1.2 V with a maximum continuous output current of 1 A. The device 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, with a maximum specified dropout of 400 mV. Quiescent current is typically 20 µA at no load and 200 µA at 1 A load, while shutdown current is less than 1 µA. The unit is housed in a DFN-6 (3x3 mm) package with wettable flanks, suitable for surface mount installation. It supports operation from -40 °C to +125 °C and holds AEC-Q100 qualification.

Feature Summary

• Logic-controlled electronic shutdown function enables ultra-low power consumption in off mode.
• Inherent stability when used with ceramic capacitors on both input and output terminals.
• Integrated protection mechanisms include short-circuit constant current limiting and thermal overload protection.

Applications

• Low-power battery-powered portable electronics
• Automotive systems requiring AEC-Q100 qualified components
• Noise-sensitive analog circuit power supplies

Procurement Notes

Verify the specific suffix 'R' indicates reel packaging configuration as per distributor listings. Confirm that the 'Y' suffix aligns with the required marking or tape-and-reel specifications for your assembly line. Ensure the DFN-6 footprint matches your PCB design guidelines, particularly regarding the exposed pad thermal connection. Cross-reference the AEC-Q100 qualification status if automotive reliability standards are mandatory for your project deployment.

Selection Notes

Select this component when a fixed 1.2 V rail is required with high efficiency under light loads due to low quiescent current. The wide input voltage range accommodates single-cell lithium battery discharge profiles. The DFN-6 package offers a compact solution for space-constrained designs. Consider the 2% output voltage tolerance for precision requirements. The absence of bypass capacitor requirement for noise performance simplifies bill of materials and layout complexity compared to other LDO families.

Part Context

This part belongs to the LD39100 series of low-dropout regulators designed for ultra-low power applications. The series distinguishes itself through very low noise characteristics without external filtering capacitors. It shares the same DFN-6 package and general protection features with variants offering different fixed output voltages ranging from 0.8 V to 4.5 V. The PU12 variant specifically targets 1.2 V logic supply needs.

Replacement Considerations

LD39100PU12R is the non-automotive grade equivalent with identical electrical specifications but lacks AEC-Q100 qualification. LD49100PU12RY is a similar 1 A LDO in the same package with comparable performance metrics; verify load regulation differences if precise transient response is critical.