LDK130M29R

Overview

The LDK130M29R is a low-dropout linear voltage regulator manufactured by STMicroelectronics, designed for automotive applications. It provides a fixed output voltage of 2.9 V with a maximum output current of 300 mA. The device operates from an input supply voltage range of 1.9 V to 5.5 V and features a typical dropout voltage of 100 mV at 100 mA load. It exhibits a low quiescent current of 30 μA and consumes less than 1 μA in shutdown mode. The component is qualified under AEC-Q100 standards for Grade 1 automotive use and is housed in an SOT23-5L package.

Feature Summary

• Logic-controlled electronic shutdown function enables total current consumption below 1 μA
• Internal constant current limiting and thermal protection mechanisms safeguard against overload conditions
• Compatible with ceramic output capacitors, specifically stabilized with 1 μF ceramic capacitors

Applications

• Low-power battery-powered applications requiring stable voltage regulation
• Automotive electronic systems requiring AEC-Q100 Grade 1 qualification
• Circuits demanding very low noise performance for sensitive analog components

Procurement Notes

Verify the specific suffix M29R confirms the 2.9 V fixed output voltage variant. Confirm the package designation matches the required SOT23-5L footprint for PCB layout compatibility. Ensure the order specifies the correct reel or cut tape quantity as per manufacturing requirements. Check for RoHS compliance documentation if environmental regulations apply to the final assembly.

Selection Notes

Select this component when a fixed 2.9 V rail is needed with minimal quiescent current draw. The low dropout characteristic supports operation from single-cell lithium batteries or similar low-voltage sources. The automotive qualification makes it suitable for harsh environment deployments where reliability is critical. Consider the 300 mA current limit when sizing for peak load demands.

Part Context

This part belongs to the LDK130 series of low-dropout regulators. The series offers various fixed output voltages ranging from 0.8 V to 3.5 V in 100 mV steps. Other variants in the family share identical electrical characteristics and protection features but differ in output voltage settings and available package options such as SOT323-5L and DFN6.

Replacement Considerations

Other LDK130 series parts with different output voltage suffixes may serve as functional substitutes if the voltage requirement changes. Verify that any replacement maintains the same SOT23-5L package and AEC-Q100 automotive grade qualification.