LD29150DT18R

Overview

The LD29150DT18R is a positive fixed-output low-dropout (LDO) linear voltage regulator manufactured by STMicroelectronics. It provides a stable 1.8V output with a maximum continuous current of 1.5A. The device features a maximum input voltage rating of 30V and maintains high accuracy with ±1% output voltage tolerance at 25°C. Key electrical parameters include a maximum dropout voltage of 0.7V at full load, line regulation of 0.5%, and load regulation of 1%. Quiescent current is limited to 40mA. Thermal performance specifies junction-to-ambient resistance at 100°C/W and junction-to-case at 8°C/W.

Feature Summary

• Integrated internal current limiting and thermal shutdown protection for robust operation under fault conditions
• Very low dropout voltage characteristic enabling efficient power management in battery-powered systems
• Logic-controlled electronic shutdown capability available within the series architecture

Applications

• Post-regulation stages for switching power supplies
• Series power supply modules for monitors and televisions
• Battery-powered portable electronic systems
• Computer system peripheral power rails

Procurement Notes

Verify the specific suffix 'DT18R' corresponds to the 1.8V fixed output variant in the DPAK package. Confirm RoHS compliance status and SVHC declarations against the latest manufacturer documentation. Ensure the ordering code matches the required tape-and-reel packaging format for automated assembly processes.

Selection Notes

Select this component when a fixed 1.8V rail is required with up to 1.5A load capacity. The DPAK package offers a balance of thermal dissipation and surface-mount convenience. Consider the 30V maximum input rating for compatibility with higher voltage bus systems. Verify that the 0.7V dropout at full load meets the minimum headroom requirements of the downstream circuitry.

Part Context

This part belongs to the LD29150 family of high-current LDO regulators from STMicroelectronics. The family includes both fixed and adjustable output variants across different packages such as TO-252 and PPAK. The DT18R specifically denotes the fixed 1.8V version in the TO-252-3 (DPAK) surface-mount package, designed for applications requiring high accuracy and low ground current.

Replacement Considerations

Direct pin-compatible substitutes within the same family include LD29150DT15R (1.5V) and LD29150DT25R (2.5V). For adjustable output needs, consider the LD29150PTR in the PPAK package. Verify that any replacement maintains the 1.5A current rating and compatible thermal characteristics.