LDI1117-1.5U

Overview

The LDI1117-1.5U is a fixed-output Low Dropout (LDO) linear voltage regulator manufactured by Diotec Semiconductor, designed for positive voltage regulation applications. It provides a nominal output voltage of 1.5V with a maximum output current capability of 1.35A. The device utilizes a SOT-89 surface-mount package and supports a maximum input voltage of 15V. Key electrical specifications include a maximum dropout voltage of 1.25V at 1A load, a typical quiescent current of 10 mA, and integrated protection features such as overcurrent limiting and thermal shutdown. The component operates within a junction temperature range of -40°C to +125°C.

Feature Summary

• Fixed 1.5V output configuration for stable power supply rails
• Integrated overcurrent and thermal shutdown protection mechanisms
• Low quiescent current operation for improved efficiency
• Surface-mount SOT-89 packaging for compact board integration

Applications

• Battery-powered portable electronic devices requiring low dropout regulation
• Embedded systems needing stable 1.5V logic or analog supply rails
• DC-DC converter post-regulation stages for noise reduction
• Industrial control modules operating in extended temperature environments

Procurement Notes

Verify the specific suffix 'U' corresponds to the SOT-89 package variant when sourcing, as other suffixes like 'H' indicate different packages such as SOT-223. Confirm RoHS compliance status and moisture sensitivity level (MSL 1) requirements against your assembly process standards. Ensure input voltage does not exceed the 15V absolute maximum rating during operation to prevent device damage.

Selection Notes

Select this component when a fixed 1.5V output is required with up to 1.35A load current in a space-constrained design. The SOT-89 package offers a balance between thermal performance and footprint size compared to smaller SMD options. Consider the 1.25V max dropout voltage at full load to ensure sufficient headroom between input and output voltages for proper regulation under all operating conditions.

Part Context

This part belongs to the LDI1117 series of low-dropout regulators from Diotec Semiconductor, which includes various fixed output voltage options and package variants. The series is categorized under PMIC linear regulators and shares common internal architecture features such as thermal protection and current limiting across different output voltage configurations.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify pin compatibility and thermal characteristics if considering alternative manufacturers' LDOs with similar 1.5V output and SOT-89 packaging.