LDS3985M33R

Overview

The LDS3985M33R is a fixed-output linear voltage regulator from STMicroelectronics, providing a stable 3.3V output with a maximum load current of 300mA. It operates within an input voltage range of 2.5V to 6V and features a low dropout voltage of 0.25V at full load. The device incorporates shutdown logic control for power management and includes internal overcurrent and thermal protection. It utilizes a SOT-23-5 surface-mount package and supports ceramic capacitors for stability.

Feature Summary

• Logic-controlled electronic shutdown function enables standby mode to reduce total system power consumption
• Internal overcurrent and thermal limit protection mechanisms ensure operational safety under fault conditions
• Compatible with low ESR ceramic capacitors for stable performance in compact designs

Applications

• Battery-powered wireless systems
• Portable information appliances
• Mobile phones

Procurement Notes

Verify the specific suffix 'M33R' against the manufacturer datasheet to confirm the 3.3V fixed output and SOT-23-5 packaging configuration. Ensure compatibility with required input voltage ranges and thermal dissipation requirements for the target application environment before finalizing procurement.

Selection Notes

Select this component for applications requiring low quiescent current and precise 3.3V regulation from single-cell battery sources. Consider the SOT-23-5 footprint constraints and verify that the 300mA output capability meets peak load demands without exceeding thermal limits.

Part Context

This part belongs to the LDS3985 series of BiCMOS voltage regulators designed for low noise and ultra-low dropout performance. The series is engineered for efficiency in portable electronics, offering fast turn-on times and wide input voltage flexibility while maintaining high power supply rejection ratios.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.