LD1117V

Overview

The LD1117V is a positive adjustable low-dropout voltage regulator manufactured by STMicroelectronics. It provides an output current of up to 950 mA with a maximum input voltage of 15 V and a minimum input voltage of 3.3 V. The device features an adjustable output voltage range from 1.25 V to 15 V, utilizing a reference voltage of 1.26 V. Key electrical parameters include a typical dropout voltage of 1 V (maximum 1.1 V), line regulation of 0.2%, and load regulation of 0.4%. The unit operates within a temperature range of 0°C to +125°C, consumes 5 mA of static current, and dissipates up to 12 W of power. It is housed in a TO-220-3 through-hole package.

Feature Summary

• Adjustable output voltage capability spanning 1.25 V to 15 V via external resistor network
• High efficiency NPN pass transistor design ensuring quiescent current primarily flows into the load
• Integrated internal thermal limit and current limit protection mechanisms for enhanced reliability

Applications

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

Procurement Notes

Verify component authenticity and datasheet alignment before integration. Confirm that the specific lot matches the required TO-220-3 through-hole package configuration. Ensure thermal management strategies account for the 12 W power dissipation rating under expected load conditions. Validate that the 1.25 V to 15 V adjustable range meets the target circuit requirements.

Selection Notes

Select this component when an adjustable positive voltage rail is required with high current capacity. The TO-220-3 package suits applications needing robust heat dissipation without active cooling. Consider the 1 V typical dropout voltage when designing for minimal input-output differential. Verify compatibility with standard 10 μF output capacitors for stability as specified in official documentation.

Part Context

This part belongs to the LD1117 series of low-dropout regulators from STMicroelectronics. The series includes both fixed and adjustable versions available in various packages such as SOT-223, DPAK, SO-8, and TO-220. The LD1117V specifically denotes the adjustable variant in the TO-220-3 through-hole package, distinguishing it from surface-mount options like the LD1117SC-R or fixed-voltage counterparts.

Replacement Considerations

Consult official substitution lists for pin-compatible alternatives. Verify that any replacement maintains the 950 mA output current and 15 V maximum input voltage limits. Ensure the substitute supports the same TO-220-3 through-hole mounting style and thermal characteristics.