LDL1117S25R

Overview

The LDL1117S25R is a fixed-output low dropout linear voltage regulator manufactured by STMicroelectronics. It provides a fixed output voltage of 2.5 V with a maximum output current capability of 1.2 A. The device operates within an input voltage range from 2.5 V to 18 V and features a typical dropout voltage of 350 mV at full load. It offers high power supply rejection ratio (PSRR) of 87 dB at 120 Hz. Integrated protections include current limiting, thermal shutdown, and safe operating area protection. The component is housed in a surface-mount SOT-223 package and supports an operating temperature range from -40 °C to +125 °C.

Feature Summary

• Provides stable 2.5 V fixed output with up to 1.2 A continuous current capability
• Features high power supply rejection ratio for effective noise filtering in sensitive circuits
• Includes internal current limit, thermal shutdown, and safe operating area protection

Applications

• Direct regulation from switching mode power supplies (SMPS)
• Secondary linear regulation stages in DC-DC converter architectures
• Power conditioning for analog and digital circuit loads requiring stable 2.5 V rails

Procurement Notes

Verify the specific part marking and datasheet revision against the manufacturer's official documentation before procurement. Ensure the ordering suffix matches the required tape-and-reel packaging configuration. Confirm that the thermal management design accommodates the SOT-223 package dissipation limits under expected load conditions. Cross-reference pinout assignments to prevent installation errors during assembly.

Selection Notes

Select this component when a fixed 2.5 V rail is required with high current capacity and superior line rejection characteristics. It is suitable for designs where input voltages vary between 2.5 V and 18 V. Consider the thermal performance in the SOT-223 package relative to ambient conditions. This regulator is appropriate for applications demanding robust protection features without external components.

Part Context

This device belongs to the LDL1117 series of high PSRR low dropout linear regulators. The series is designed to provide reliable voltage regulation with integrated safety features. The LDL1117S25R specifically targets applications requiring a fixed 2.5 V output. It complements other variants in the family that offer different fixed voltage options or adjustable configurations.

Replacement Considerations

Consult official substitution lists for compatible parts within the same product family. Verify pin compatibility and electrical specifications before replacing existing components.