LDK130PU33R

Overview

The LDK130PU33R is a low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides a fixed output voltage of 3.3 V with a maximum output current of 300 mA. The device operates within an input voltage range of 1.9 V to 5.5 V and features a typical dropout voltage of 100 mV. It utilizes a 6-pin DFN (1.2x1.3 mm) surface-mount package. Key electrical characteristics include a quiescent current of 120 µA, a shutdown current below 1 µA when enabled, and a power supply rejection ratio of 55 dB at frequencies between 120 Hz and 10 kHz. The unit supports operation across a temperature range of -40 °C to +125 °C.

Feature Summary

• Logic-controlled electronic shutdown function enables deep sleep mode for ultra-low power consumption
• Compatible with small ceramic output capacitors, specifically 1 µF, for stable regulation
• Integrated short-circuit constant current limiting and thermal protection mechanisms

Applications

• Low-power battery-powered portable devices requiring extended runtime
• Noise-sensitive analog circuits in consumer electronics
• Embedded systems utilizing ceramic decoupling capacitors

Procurement Notes

Verify the specific suffix 'PU33R' against official STMicroelectronics documentation to confirm the 3.3 V fixed output, 300 mA rating, and 6-DFN package configuration. Ensure compatibility with required input voltage ranges and load conditions before integration. Cross-reference datasheet revisions to validate performance parameters such as quiescent current and dropout voltage under actual operating temperatures.

Selection Notes

Select this component for applications demanding low noise and minimal static current draw from compact footprints. The 6-DFN package suits space-constrained designs. Verify that the input voltage remains within the 1.9 V to 5.5 V window and that the load does not exceed 300 mA. Consider the 55 dB PSRR for noise-sensitive environments where ceramic capacitors are preferred over tantalum or electrolytic types.

Part Context

The LDK130 series comprises low-dropout regulators designed for efficiency and noise reduction. The PU33R variant specifically targets fixed 3.3 V outputs. This model belongs to a family offering various fixed voltages and packages, including SOT23-5L and SOT323-5L. The DFN6 format distinguishes it by providing a smaller thermal profile suitable for dense PCB layouts while maintaining robust thermal protection features.

Replacement Considerations

LDK130PU12R: Same package and current rating but fixed 1.2 V output. LD39050PU33R: Similar 3.3 V output and DFN package but higher quiescent current (200 µA). LDK120PU33R: Lower current capacity (200 mA) with identical voltage and package.