LD49100PU18RY

Overview

The LD49100PU18RY is a fixed-output low-dropout linear regulator manufactured by STMicroelectronics, providing a stable 1.8 V output with a maximum current capacity of 1 A. It operates within an input voltage range of 1.5 V to 5.5 V and features a typical dropout voltage of 200 mV at full load. The device exhibits very low quiescent current, consuming 20 µA at no load and 200 µA at 1 A load, while drawing less than 1 µA in shutdown mode. It includes internal protection against short circuits and thermal overload, alongside a 1 ms soft-start circuit. The component is housed in a compact DFN6 (3x3 mm) package with wettable flanks and holds AEC-Q100 Grade 1 qualification for automotive reliability.

Feature Summary

• AEC-Q100 Grade 1 qualified for automotive applications
• Ultra-low dropout voltage ensuring high efficiency under varying loads
• Integrated Power Good indicator for system monitoring and sequencing
• Logic-controlled electronic shutdown with minimal standby consumption

Applications

• Automotive infotainment systems
• Advanced Driver Assistance Systems (ADAS)
• Telematics control units
• Body electronics modules

Procurement Notes

Verify the specific ordering code LD49100PU18RY matches the required 1.8 V fixed output configuration. Confirm that the DFN6 package with wettable flanks aligns with your PCB footprint design rules. Ensure compliance with RoHS directives as specified in the datasheet. Check for any specific environmental grades or ECOPACK requirements relevant to your manufacturing standards before finalizing procurement.

Selection Notes

Select this regulator when designing automotive power supplies requiring a fixed 1.8 V rail with up to 1 A capability. It is suitable for noise-sensitive applications due to its low-noise characteristics without external bypass capacitors. Consider the thermal resistance and PCB layout requirements for heat dissipation if operating near maximum current limits. Verify that the input voltage remains within the 1.5 V to 5.5 V range for proper regulation.

Part Context

This component belongs to the LD49100 family of ultra-low-dropout regulators designed specifically for automotive environments. The family offers various fixed output voltages and adjustable versions, all sharing common features like low quiescent current and robust protection mechanisms. The LD49100PU18RY represents the fixed 1.8 V variant within this portfolio, standardized for use in strict automotive quality and performance frameworks.

Replacement Considerations

Direct substitutes within the same series include other fixed-voltage variants such as LD49100PU12RY or LD49100PU25RY, provided the output voltage requirement differs. For adjustable output needs, the LD49100PURY serves as a functional alternative within the same package and qualification class.