LD39030DTPU28R

Overview

The LD39030DTPU28R is a fixed-output linear voltage regulator from STMicroelectronics, providing a stable 2.8 V output with a maximum current capacity 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 330 mV at full load. The device incorporates internal soft-start, overcurrent protection, and thermal shutdown mechanisms. It utilizes a 4-DFN (1x1 mm) surface-mount package and supports operation across a junction temperature range of -40°C to +125°C.

Feature Summary

• Ultra-low quiescent current consumption for extended battery life in portable devices
• Logic-controlled enable pin allows for efficient power management and deep shutdown modes
• Integrated soft-start circuit limits inrush current during power-up sequences
• High power supply rejection ratio ensures stable output under noisy conditions

Applications

• Battery-powered consumer electronics requiring low standby current
• Portable medical devices needing precise voltage regulation
• Smart home gateways and IoT sensor nodes
• Industrial thermostats and environmental monitoring systems

Procurement Notes

Verify the specific suffix 'D' against the datasheet to confirm it denotes the standard version with ±2.0% output tolerance, distinct from the 'A' variant which offers tighter accuracy. Ensure the ordering part number matches the required reel or cut-tape packaging format. Confirm RoHS compliance status and moisture sensitivity level requirements prior to final procurement decisions.

Selection Notes

Select this component when a compact footprint is critical due to its small 4-DFN package size. It is suitable for designs where input voltages are close to the output level, leveraging its low dropout characteristics. Consider the standard tolerance if high precision is not mandatory, as it may offer cost advantages over higher-grade variants while maintaining reliable performance for general-purpose applications.

Part Context

This regulator belongs to the LD39030 family, designed for space-constrained applications. It shares core architectural features with other members of the series but differs in output voltage and tolerance specifications. The DTPU28R designation specifically identifies the 2.8 V fixed output version packaged in a leadless DFN format optimized for automated surface-mount assembly processes.

Replacement Considerations

The LD39030ADTPU28R serves as a direct substitute from the same manufacturer, offering improved output voltage accuracy. Cross-brand alternatives such as the NCP160AMX280TBG may be considered if pin compatibility and electrical parameters align with the design requirements.