LDI559-3.3EN

Overview

The LDI559-3.3EN is a fixed linear voltage regulator IC from Diotec Semiconductor, housed in an SOT-23-5 package. It provides a positive fixed output voltage of 3.3 V with a maximum output current of 300 mA. The device supports an input voltage range from 2.5 V to 18 V and exhibits a typical dropout voltage of 160 mV at 100 mA load.

Feature Summary

• Fixed output voltage regulation for stable power supply applications
• Low dropout characteristic enabling efficient operation near input limits
• Compact surface-mount packaging suitable for space-constrained designs

Applications

• Portable battery-powered electronic devices
• Embedded system power management circuits
• General-purpose low-dropout voltage regulation

Procurement Notes

Verify the specific manufacturer part number against official Diotec Semiconductor documentation to confirm electrical characteristics and pinout compatibility. Ensure that the sourcing channel provides genuine components with traceable origin to avoid counterfeit risks. Cross-reference datasheet revisions to guarantee alignment with current manufacturing specifications before integration into production.

Selection Notes

Select this component when a fixed 3.3 V output is required within an 18 V input limit and moderate current delivery up to 300 mA is sufficient. The SOT-23-5 form factor offers a balance between thermal performance and board space efficiency. Evaluate thermal dissipation requirements based on the expected voltage differential and load current to ensure reliable operation under worst-case conditions.

Part Context

This component belongs to Diotec Semiconductor's family of linear voltage regulators designed for general-purpose applications. The LDI559 series utilizes standard CMOS technology to achieve low quiescent current and robust stability without external compensation capacitors in many configurations. It serves as a cost-effective solution for powering digital logic and analog circuits requiring precise voltage levels.

Replacement Considerations

Direct substitutes include other 3.3 V fixed LDOs in SOT-23-5 packages such as the MIC5205 or NCP1117 variants, provided pinouts and electrical tolerances match the design requirements. Verify thermal resistance and dropout voltage similarities to maintain circuit performance integrity during replacement.