LDK320ADU50R

Overview

The LDK320ADU50R is a fixed-output low-dropout linear voltage regulator manufactured by STMicroelectronics, providing a stable 5 V output with a maximum current of 200 mA. It operates within an input voltage range of 2.5 V to 18 V and features a typical dropout voltage of 100 mV at 100 mA load. The device incorporates logic-controlled electronic shutdown, reducing quiescent current to less than 1 μA in off mode. It includes short-circuit current limiting, thermal protection, and over-current protection. The component is housed in an SOT-89 surface-mount package and supports operation across a temperature range of -40 °C to +125 °C.

Feature Summary

• High accuracy output voltage tolerance of ±0.5% at 25 °C
• Logic-controlled enable pin for electronic shutdown
• Integrated short-circuit, thermal, and SOA protections

Applications

• Digital signal controllers (DSC)
• Television systems
• Blu-ray and DVD players
• Personal computers and peripherals
• Industrial equipment

Procurement Notes

Verify the specific suffix 'DU' indicates the SOT-89 package configuration and the '50' designates the 5 V fixed output. Confirm that the ADJ pin functionality is not required, as it is unavailable on this package variant. Ensure compliance with RoHS3 standards and check for any recent production change notices regarding lead-frame updates or packaging modifications before finalizing procurement orders.

Selection Notes

Select this component when a fixed 5 V rail is required from inputs up to 18 V with high precision. The ±0.5% tolerance suits sensitive analog circuits. The SOT-89 package offers better thermal dissipation compared to smaller alternatives. Verify that the application does not require adjustable voltage settings, as the ADJ pin is absent in this package type. Consider the 200 mA limit for total system power budgeting.

Part Context

This part belongs to the LDK320 family of low-dropout regulators designed for battery-powered applications due to low quiescent current. The series provides various fixed voltages and packages. The 'A' suffix denotes the higher accuracy version compared to standard variants. The LDK320 family is optimized for ceramic capacitor stability, simplifying external component requirements while maintaining robust dynamic performance.

Replacement Considerations

LDK320AU50R