LD1117AV

Overview

The LD1117AV is a positive low-dropout voltage regulator manufactured by STMicroelectronics. It provides an adjustable output voltage ranging from 1.25V to 15V with a maximum output current of 1.0A. The device features a typical dropout voltage of 1.15V at full load and 25°C. It incorporates internal thermal overload protection and current limiting to ensure safe operation under fault conditions.

Feature Summary

• Adjustable output voltage capability via external resistor network
• Internal thermal overload and short-circuit current limiting protection
• Designed for direct connection to automotive battery systems

Applications

• Standby microprocessor control-unit systems
• Automotive applications requiring direct battery connection
• General-purpose linear power regulation

Procurement Notes

Verify the specific package type, as the LD1117AV designation may correspond to different physical packages such as TO-220 or SOT-223 depending on the manufacturer's suffix conventions. Confirm the component status, as some sources indicate this part number may be obsolete or superseded by newer revisions. Ensure the datasheet matches the required electrical specifications for your design.

Selection Notes

Select this component when an adjustable positive voltage rail is required with up to 1A capacity. It is suitable for applications where the input voltage exceeds the desired output by a small margin. Consider the thermal dissipation requirements in the chosen package, as power loss depends on the voltage differential and load current.

Part Context

This component belongs to the LD1117 family of low-dropout regulators. The 'A' variant typically denotes the 1.0A current rating version, distinct from higher-current counterparts. It serves as a fixed or adjustable regulator solution for portable and industrial electronics requiring efficient linear regulation.

Replacement Considerations

Check for active replacements within the LD1117 series or compatible LDO families from STMicroelectronics. Verify pin compatibility and thermal performance if substituting with similar adjustable regulators from other manufacturers.