LD59030DTPU18R

Overview

The LD59030DTPU18R is a fixed-output low dropout linear regulator from STMicroelectronics, providing a stable 1.8 V output with a maximum current of 300 mA. It operates within an input voltage range of 1.5 V to 5.5 V and features a typical dropout voltage of 135 mV at full load. The device exhibits a quiescent current of 28 µA and offers high power supply rejection ratio (PSRR) of 75 dB at 1 kHz. Packaged in a compact DFN-4 (1x1 mm) surface-mount format, it supports operation across a temperature range of -40 °C to +125 °C.

Feature Summary

• Ultra-low dropout voltage performance ensures efficient regulation under minimal input-to-output differentials.
• Logic-controlled enable function allows for deep shutdown mode with negligible standby current consumption.
• Integrated protection mechanisms include thermal shutdown and internal current fold-back for fault safety.

Applications

• Low power battery-operated portable devices
• Space-constrained embedded systems requiring small footprint regulators
• Noise-sensitive analog or RF circuit power supplies

Procurement Notes

Verify the specific suffix '18R' corresponds to the 1.8 V fixed output variant when sourcing. Confirm the package designation matches the required DFN-4 footprint for PCB layout compatibility. Ensure compliance with RoHS directives if applicable to your manufacturing region. Cross-reference the manufacturer part number directly with official distributor catalogs to avoid counterfeit components.

Selection Notes

Select this component when a fixed 1.8 V rail is required with minimal board space constraints. It is suitable for applications demanding low noise and high PSRR from a single-cell lithium battery or similar low-voltage source. Consider the thermal dissipation capabilities of the DFN-4 package relative to the expected load current and ambient temperature conditions.

Part Context

This part belongs to the LD59030 series of 300 mA very low dropout linear regulators. The series is characterized by high accuracy and compatibility with ceramic output capacitors. The DTPU18R designation specifically identifies the 1.8 V output version within the broader family of adjustable and fixed voltage options available in the DFN4 1x1 package.

Replacement Considerations

Direct substitutes within the same series include LD59030DTPU30R (3.0 V output) and LD59030DTPU25R (2.5 V output), provided the system voltage requirements differ. Verify that any replacement maintains the same DFN-4 package and electrical characteristics such as quiescent current and dropout voltage.