LDK130M33R

Overview

The LDK130M33R is a low-dropout linear voltage regulator manufactured by STMicroelectronics, designed for automotive applications using the SOT23-5L package. 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 at 100 mA load. Quiescent current is typically 30 μA, reducing to less than 1 μA in shutdown mode. It includes logic-controlled enable functionality, short-circuit constant current limiting, and thermal protection. The component is AEC-Q100 qualified for Grade 1 and supports ceramic capacitors as small as 1 μF on the output.

Feature Summary

• Automotive-grade reliability with AEC-Q100 qualification for Grade 1 applications
• Ultra-low quiescent current consumption suitable for battery-powered systems
• Logic-controlled electronic shutdown enabling deep sleep modes with minimal power drain
• Integrated protection mechanisms including short-circuit current limiting and thermal overload protection

Applications

• Low-power battery-operated automotive electronics
• Noise-sensitive analog circuit power supplies
• Embedded system voltage regulation requiring high stability with ceramic capacitors

Procurement Notes

Verify that the specific part number suffix matches the required automotive grade and package configuration. Confirm that the ordering information aligns with the SOT23-5L package designation. Ensure compliance with RoHS directives and check for any specific environmental compliance markings required for your region. Cross-reference the manufacturer's latest datasheet to confirm active status and availability before finalizing procurement plans.

Selection Notes

Select this component when designing circuits that require strict automotive reliability standards combined with ultra-low power consumption. The fixed 3.3 V output eliminates external resistor networks, simplifying layout. Its compatibility with small ceramic output capacitors reduces board space requirements compared to older LDOs requiring tantalum or electrolytic capacitors. Ensure the input voltage remains within the 1.9 V to 5.5 V range to maintain regulation and avoid excessive power dissipation.

Part Context

This device belongs to the LDK130 series of low-dropout regulators from STMicroelectronics. The series is characterized by very low noise and low quiescent current, making it distinct from standard general-purpose LDOs. While other variants in the family offer different output voltages or packages like DFN6, the M33R variant specifically denotes the 3.3 V fixed output in the automotive-qualified SOT23-5L package.

Replacement Considerations

Direct substitutes include other LDK130 series variants with compatible pinouts and electrical characteristics, such as LDK130M28RY for 2.8 V output. Verify that any replacement maintains the SOT23-5L package and AEC-Q100 Grade 1 qualification to ensure mechanical and reliability compatibility in automotive assemblies.