LDL112PU18R

Overview

The LDL112PU18R is a low-dropout linear regulator manufactured by STMicroelectronics, designed for applications requiring high efficiency and low power consumption. It provides a fixed output voltage of 1.8 V with a maximum output current capability of 1.2 A. The device operates within an input voltage range of 1.6 V to 5.5 V and features a typical dropout voltage of 300 mV at full load. Key electrical specifications include a quiescent current of 70 µA and a power supply rejection ratio (PSRR) of 57 dB at 1 kHz. The component is housed in a surface-mount 6-DFN package and supports an operating temperature range from -40 °C to +125 °C.

Feature Summary

• Integrated reverse current protection prevents backflow when the input voltage drops below the output level.
• Logic-controlled enable function allows for electronic shutdown with ultra-low standby current consumption.
• Internal circuitry includes thermal overload protection and current limiting to safeguard against fault conditions.

Applications

• Battery-powered portable devices requiring extended operational life
• Low-power embedded systems with strict voltage regulation needs
• Portable consumer electronics utilizing ceramic output capacitors

Procurement Notes

Verify the specific suffix 'U' against official STMicroelectronics documentation to confirm pinout compatibility and exact electrical tolerances. Ensure the selected package variant matches the PCB footprint requirements. Cross-reference the part number with authorized distributors to confirm availability and authenticity before finalizing procurement plans.

Selection Notes

Select this component for designs prioritizing low quiescent current and robust protection features in a compact form factor. The fixed 1.8 V output eliminates the need for external feedback resistors, simplifying the bill of materials. Consider the 6-DFN package dimensions for space-constrained layouts and verify thermal dissipation capabilities under maximum load conditions.

Part Context

This part belongs to the LDL112 series of low-dropout regulators, which are engineered for battery-operated applications. The series emphasizes low static current and reverse current protection to enhance system reliability. The LDL112PU18R specifically offers a fixed 1.8 V output, distinguishing it from adjustable variants within the same family while sharing core protection mechanisms.

Replacement Considerations

Consult official substitution guides for compatible LDOs with similar current ratings and voltage outputs. Verify that alternative components support the required 1.2 A load and maintain comparable PSRR performance. Ensure any substitute part fits the 6-DFN package or requires appropriate adapter considerations.