LD1117DTC-R

Overview

The LD1117DTC-R is an adjustable low-dropout positive voltage regulator manufactured by STMicroelectronics. It provides an output current of up to 800 mA with a reference voltage of 1.25 V. The device operates within an input voltage range of 3.3 V to 15 V and supports an adjustable output voltage range from 1.25 V to 15 V. It features a typical dropout voltage of 1 V at maximum load and maintains a quiescent current of 5 mA. The component is housed in a surface-mount SOT-223 package with four pins.

Feature Summary

• Utilizes an NPN pass transistor architecture to ensure high efficiency, directing quiescent current primarily into the load rather than dissipating it internally.
• Incorporates internal current limiting and thermal shutdown protection mechanisms to safeguard the device under fault conditions or excessive heat generation.
• Requires only a standard 10 μF minimum capacitor for stability, simplifying external circuit design and reducing component count.

Applications

• Battery-powered systems requiring efficient linear regulation
• Post-regulation stages for switching power supplies
• General-purpose power management circuits

Procurement Notes

Verify the specific suffix 'DTC' against official datasheets to confirm the exact package type and tape-and-reel configuration. Ensure compatibility with the target PCB footprint for the SOT-223 form factor. Confirm that the operating temperature range aligns with system requirements, as variations may exist between manufacturing batches.

Selection Notes

Select this component when a stable 800 mA supply is needed with minimal voltage drop across the regulator. The adjustable version allows precise voltage setting via external resistors. Consider the thermal performance of the SOT-223 package relative to the expected power dissipation in the final application environment.

Part Context

This part belongs to the LD1117 series of low-dropout regulators. The series includes fixed voltage options (1.2 V, 1.8 V, 2.5 V, 3.3 V, 5.0 V) and adjustable variants. Other packages in the family include DPAK, SO-8, and TO-220, offering flexibility for different thermal and space constraints.

Replacement Considerations

Check for pin-compatible alternatives within the same LD1117 family. Verify that substitute parts maintain the 800 mA current rating and similar dropout characteristics. Ensure any replacement matches the SOT-223 package dimensions if board space is constrained.