LD39130SPU31R

Overview

The LD39130SPU31R is a fixed-output low-dropout linear regulator from STMicroelectronics, providing a nominal 3.1 V output with a maximum current of 300 mA. It operates within an input voltage range of 1.4 V to 5.5 V and features an ultra-low dropout voltage of 300 mV at full load. The device incorporates automatic green mode for enhanced efficiency at light loads, reducing quiescent current to 1 µA. It includes logic-controlled shutdown, internal soft-start, and thermal protection, housed in a Flip-chip 4 bump package.

Feature Summary

• Ultra-low dropout voltage capability ensures efficient power delivery under heavy loads.
• Automatic green mode dynamically switches between high-efficiency standby and fast transient response modes based on load conditions.
• Logic-controlled electronic shutdown enables deep sleep states with minimal standby current consumption.
• Integrated internal soft-start circuit limits inrush current during power-up sequences.

Applications

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

Procurement Notes

Verify the specific suffix 'PU31R' against official documentation to confirm the exact output voltage tolerance and packaging configuration. Ensure compatibility with the required Flip-chip footprint and check for RoHS compliance status prior to finalizing procurement orders.

Selection Notes

Select this component when space constraints require a Flip-chip package and precise 3.1 V regulation is necessary. Consider its low quiescent current for battery-operated applications requiring extended standby times. Verify that the input voltage remains within the specified operating range to maintain stability.

Part Context

This part belongs to the LD39130S family of high-accuracy voltage regulators designed for portable electronics. The series offers various fixed output voltages and adjustable versions, utilizing either DFN6 or Flip-chip packages to maximize board space savings while maintaining robust performance characteristics.

Replacement Considerations

Consult official substitution lists for equivalent LDOs with matching output voltages and current ratings. Verify pinout compatibility and package dimensions before replacing components in existing designs.

FAQ

How does the automatic green mode function?

The device automatically switches to an ultra-low consumption mode at light loads and returns to normal mode with fast transient response when the load current increases.

What is the purpose of the enable pin?

The enable pin allows logic-controlled shutdown of the regulator, putting it into a standby mode with very low current consumption.