LD39030SJ25R

Overview

The LD39030SJ25R is a low noise linear voltage regulator from STMicroelectronics providing a fixed 2.5 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 200 mV at full load. The device utilizes a flip-chip 4 bumps package measuring 0.8 x 0.8 mm. Key electrical characteristics include a quiescent current of 20 µA at no load, power supply rejection ratio (PSRR) of 62 dB at 1 kHz, and output voltage tolerance of ±2.0% at 25 °C.

Feature Summary

• Ultra-low dropout voltage capability for efficient battery-powered operation
• Very low quiescent current consumption extending battery life
• Low noise performance suitable for sensitive analog circuits
• Integrated enable logic control for electronic shutdown

Applications

• Low power battery-operated applications
• Portable consumer electronics
• Noise-sensitive signal processing circuits

Procurement Notes

Verify the specific suffix 'SJ' indicates the flip-chip package variant distinct from other LD39030 packages. Confirm the output voltage is fixed at 2.5 V as indicated by the model number. Check for RoHS compliance status in the latest datasheet revision. Ensure the component meets the required operating temperature range of -40 °C to +125 °C for your application environment.

Selection Notes

Select this component when space constraints require a compact flip-chip footprint alongside low noise requirements. It is appropriate for designs needing high PSRR at low frequencies. Consider the 200 mV typical dropout when designing for minimum input-output voltage differentials. Verify ceramic capacitor stability compatibility as specified in the datasheet.

Part Context

This part belongs to the LD39030 series of low dropout regulators designed for ultra-low power applications. Unlike the standard DFN4 package versions, the SJ suffix denotes a flip-chip configuration optimized for minimal board area. The series emphasizes low quiescent current and low noise, targeting portable devices where power efficiency and signal integrity are critical.

Replacement Considerations

Public confirmed substitute part numbers were not identified in the provided source material.