LDK320ADU33R

Overview

The LDK320ADU33R is a fixed-output low-dropout linear voltage regulator manufactured by STMicroelectronics, providing a nominal 3.3 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 exhibits high power supply rejection ratio (PSRR) of 88 dB at 120 Hz and maintains low quiescent current of 60 μA typ. Output voltage accuracy is ±0.5% at 25 °C for the 'A' grade. It includes logic-controlled electronic shutdown consuming less than 1 μA in off mode, and incorporates short-circuit, thermal, and SOA protections.

Feature Summary

• Logic-controlled electronic shutdown enables ultra-low standby consumption below 1 μA
• High PSRR of 88 dB at 120 Hz ensures effective noise suppression
• Compatible with ceramic output capacitors as small as 1 μF
• Integrated short-circuit, thermal, and safe operating area protections

Applications

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

Procurement Notes

Verify the specific suffix 'DU33R' corresponds to the SOT-89 package and 3.3 V fixed output configuration. Confirm RoHS compliance status via official documentation before integration. Ensure design accounts for thermal resistance values provided in the datasheet for the selected package type to maintain junction temperature within specified limits during operation.

Selection Notes

Select this component when a stable 3.3 V rail is required from varying input sources between 2.5 V and 18 V. The high accuracy variant is suitable for precision analog circuits requiring tight voltage tolerance. Consider the SOT-89 package for better thermal dissipation compared to smaller alternatives. Verify that the application does not require adjustable output or enable pin functionality, as these are not available in this specific package version.

Part Context

This part belongs to the LDK320 family of low-dropout regulators designed for low-power battery applications. The series offers various fixed output voltages and packages including SOT23-5L and SOT-89. The 'A' designation indicates improved output voltage accuracy compared to standard versions. The family supports wide input ranges and provides robust protection features for reliable operation in consumer and industrial environments.

Replacement Considerations

LDK320ADU30R: Same package and features with 3.0 V fixed output.