LD57100J800R

Overview

The LD57100J800R is a fixed-output low-dropout linear regulator manufactured by STMicroelectronics. It provides a nominal output voltage of 0.8 V with a guaranteed maximum output current of 1 A. The device utilizes an NMOS pass transistor biased by a dedicated pin, enabling ultra-low dropout performance even at minimal input voltages. Operating conditions include an input voltage range from the output level up to 5.5 V and a bias supply range of 3.0 V to 5.5 V. Quiescent current is typically 35 μA at no load. The unit features ±1% output voltage tolerance across the temperature range and operates within -40 °C to +85 °C.

Feature Summary

• Ultra-low dropout voltage capability achieved through dedicated gate biasing of the NMOS pass element
• Logic-controlled electronic shutdown function for deep power saving applications
• Integrated protection mechanisms including internal current limiting and thermal shutdown
• Output active discharge function to rapidly remove charge when disabled

Applications

• Smartphones
• Cameras
• Low voltage post regulation

Procurement Notes

Verify the specific ordering code LD57100J800R against official STMicroelectronics documentation to confirm the 0.8 V fixed output specification. Ensure compatibility with the Flip Chip6 package dimensions and footprint requirements during procurement planning. Confirm RoHS compliance status via the manufacturer's latest datasheet revision before finalizing orders.

Selection Notes

Select this component for battery-operated systems requiring high accuracy and minimal space utilization. The dedicated bias pin allows operation with very low input-to-output voltage differentials compared to standard LDOs. Verify that the application circuit can support the required bias voltage range of 3.0 V to 5.5 V. Consider the small Flip Chip6 package size for dense PCB layouts where board area is constrained.

Part Context

This part belongs to the LD57100 series of 1 A ultra-low-dropout regulators. The series is characterized by high precision and compact packaging designed for portable electronics. The J800 suffix specifically denotes the 0.8 V fixed output variant within the product family, distinguishing it from other voltage options available in the same package.

Replacement Considerations

LD57100J100R

FAQ

How does the LD57100 achieve ultra-low dropout performance?

It uses an NMOS pass transistor whose gate is biased by a dedicated VBIAS pin, allowing the device to regulate effectively even when the input voltage is very close to the output voltage.

What is the purpose of the SNS/FB pin?

In the fixed version like the LD57100J800R, the SNS pin serves as the output voltage sense connection. It should be connected to the load via a separate PCB track to ensure accurate regulation.