LDK320AU50R

Overview

The LDK320AU50R is a fixed-output low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides a nominal output voltage of 5 V with a maximum output current capability of 200 mA. The device operates from an input voltage range spanning 2.5 V to 18 V. It features a typical dropout voltage of 100 mV at a 100 mA load and maintains a low quiescent current of 60 μA typ. The unit utilizes the SOT-89 surface-mount package and supports an operating junction temperature range from -40 °C to +125 °C.

Feature Summary

• Logic-controlled electronic shutdown function enables deep sleep mode with minimal power consumption
• Integrated short-circuit current limiting, thermal protection, and Safe Operating Area safeguards
• High Power Supply Rejection Ratio ensures stable performance against input line noise
• Compatible with standard ceramic output capacitors for circuit stability

Applications

• Digital Signal Controllers (DSC)
• Television systems
• Blu-ray and DVD players
• Personal computers and peripherals
• Industrial control equipment

Procurement Notes

Verify the specific suffix 'U' corresponds to the SOT-89 package configuration during procurement. Confirm that the 'A' designation aligns with the required ±0.5% output voltage tolerance specification. Ensure the ordering part number matches the exact manufacturer datasheet identifier to avoid pinout or electrical characteristic mismatches in final assembly.

Selection Notes

Select this component when a fixed 5 V rail is required within a wide input voltage window up to 18 V. The SOT-89 package offers higher thermal dissipation capabilities compared to smaller alternatives. Verify that the application load remains below the 200 mA limit to maintain regulation accuracy and prevent triggering internal thermal protections under worst-case ambient conditions.

Part Context

This device belongs to the LDK320 family of low-dropout regulators designed for battery-powered applications requiring high dynamic characteristics. The family includes adjustable versions and variants with different output tolerances. The LDK320AU50R specifically targets fixed-voltage requirements while maintaining low noise and high PSRR for sensitive analog and digital loads.

Replacement Considerations

Consult official STMicroelectronics documentation for confirmed substitute part numbers. Cross-reference package dimensions and pinouts carefully when evaluating alternative components.