LD39100PU18RY

Overview

The LD39100PU18RY is a low-dropout linear voltage regulator manufactured by STMicroelectronics, designed for applications requiring stable power delivery with minimal noise. It provides a fixed output voltage of 1.8 V and supports a maximum output current of 1 A. The device 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. Quiescent current is specified at 200 µA under load conditions. It is housed in a DFN-6 surface-mount package and is qualified according to the AEC-Q100 automotive standard. The operational temperature range extends from -40 °C to +125 °C.

Feature Summary

• Fixed 1.8 V output voltage with 1 A continuous current capability
• AEC-Q100 qualification for automotive reliability standards
• Ultra-low dropout performance ensuring efficiency at low voltage differentials
• Logic-controlled shutdown function for minimizing standby power consumption

Applications

• Automotive electronic systems requiring certified power regulation
• Battery-powered devices needing extended operational life
• Noise-sensitive analog or RF circuit power supplies
• Embedded control units in harsh thermal environments

Procurement Notes

Verify the specific suffix 'RY' against the manufacturer's official datasheet to confirm the reel packaging configuration and tape-and-reel specifications. Ensure that the fixed 1.8 V output variant matches the design requirements, as other output voltages exist within the same family. Confirm AEC-Q100 compliance documentation is available if the application mandates automotive-grade certification. Check moisture sensitivity levels and recommended reflow profiles prior to assembly.

Selection Notes

Select this component when a fixed 1.8 V rail is required with high current capacity in a compact footprint. The AEC-Q100 qualification makes it suitable for automotive environments where reliability is critical. Compare line and load regulation specifications against system tolerance requirements. Consider the DFN-6 package thermal characteristics and ensure adequate PCB copper area for heat dissipation given the 1 A output capability.

Part Context

This part belongs to the LD39100 series of low-quiescent-current, low-noise voltage regulators. The series offers various fixed output voltages and adjustable versions to accommodate diverse system needs. All variants share common architectural features including internal current limiting, thermal protection, and stability with ceramic capacitors. The LD39100PU18RY specifically addresses designs requiring a precise 1.8 V supply without the need for external feedback resistors.

Replacement Considerations

Direct substitutes include other LD39100 variants with different fixed output voltages if the voltage requirement can be adjusted. Verify pin compatibility and thermal performance when considering alternative LDO families. Cross-reference with LD49100 series parts for similar form factors but distinct electrical characteristics.