LDK320ADU30R

Overview

The LDK320ADU30R is a fixed-output low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides a nominal output voltage of 3 V with a maximum output current of 200 mA. The device 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. It incorporates high power supply rejection ratio (PSRR) performance, achieving 88 dB at 120 Hz. The quiescent current is typically 60 μA, reducing to less than 1 μA in shutdown mode via the enable pin. Output voltage accuracy is specified at ±0.5% at 25 °C for the 'A' variant. The component includes short-circuit current limiting, thermal protection, and SOA protection, ensuring reliable operation across a temperature range of -40 °C to +125 °C.

Feature Summary

• Logic-controlled electronic shutdown function enables deep sleep mode with ultra-low standby current consumption.
• High power supply rejection ratio ensures effective noise suppression from input supply variations.
• Integrated protection mechanisms include short-circuit current limiting, thermal shutdown, and safe operating area safeguards.
• Compatible with small ceramic output capacitors, simplifying circuit design and minimizing board space requirements.

Applications

• Digital signal controllers
• Television systems
• Blu-ray and DVD players
• Personal computers
• Industrial control modules

Procurement Notes

Verify the specific suffix 'DU30R' against official documentation to confirm the SOT-89 package type and 3 V fixed output configuration. Ensure compatibility with required PCB footprint dimensions for the SOT-89 housing. Confirm environmental compliance status such as RoHS directives through the manufacturer's latest datasheet or product selection guide before finalizing procurement specifications.

Selection Notes

Select this component when a stable 3 V rail is required from inputs up to 18 V with minimal quiescent drain. The high PSRR makes it suitable for noise-sensitive analog sections powered by noisy digital rails. Consider the thermal resistance characteristics of the SOT-89 package for heat dissipation under maximum load conditions. Verify that the required output current does not exceed the 200 mA limit during peak operational states.

Part Context

This part belongs to the LDK320 family of low-dropout regulators designed for cost-effective power management in consumer and industrial electronics. The family offers various output voltages and packages, including SOT23-5L and SOT-89. The 'A' designation indicates enhanced output voltage tolerance compared to standard variants. These regulators are engineered for battery-powered applications requiring extended runtime due to their low static current consumption.

Replacement Considerations

Consult official STMicroelectronics substitution guides for verified alternatives. Cross-reference pinouts and electrical parameters carefully if considering non-ST components. Ensure any substitute supports the same SOT-89 package and meets the 18 V input voltage requirement.