LD39115J25R

Overview

The LD39115J25R is a fixed-output low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides a fixed output voltage of 2.5 V with a maximum continuous output current of 150 mA. The device operates within an input voltage range of 1.5 V to 5.5 V and features a typical dropout voltage of 80 mV at a 100 mA load. Key electrical parameters include a quiescent current of 20 µA (typical) at no load, power supply rejection ratio of 65 dB at low frequencies, and output noise of 33 µV RMS from 1 kHz to 100 kHz. It incorporates logic-controlled enable functionality for shutdown modes with current consumption below 1 µA, alongside internal overcurrent and thermal protection mechanisms.

Feature Summary

• Ultra-low dropout voltage characteristic enabling efficient operation in battery-powered applications
• Very low quiescent current and low noise profile suitable for sensitive analog circuits
• Logic-controlled electronic shutdown function allowing deep sleep states
• Integrated short-circuit constant current limiting and thermal protection

Applications

• Low power battery-powered portable devices
• RF and analog circuit power supplies requiring low noise
• Embedded systems utilizing STM32 microcontrollers
• Healthcare and wellness electronic equipment

Procurement Notes

Verify the specific suffix 'J25R' against official STMicroelectronics documentation to confirm the 2.5 V fixed output variant. Ensure compatibility with the 4-flipchip package dimensions and check for any end-of-life or not recommended for new design statuses in current catalogs before finalizing procurement plans.

Selection Notes

Select this component when a stable 2.5 V rail is required with minimal footprint and high efficiency under light loads. Consider the 150 mA current limit and 5.5 V maximum input voltage constraints. Verify that the application environment stays within the -40 °C to 125 °C operating temperature range and that ceramic capacitors are used for stability as specified.

Part Context

This part belongs to the LD39115 family of low-quiescent current, low-noise LDO regulators. The family shares common architectural features including flip-chip packaging and robust protection circuits, differing primarily in fixed output voltage options ranging from 0.8 V to 4.5 V. The LD39115 series is designed for space-constrained, high-performance portable electronics.

Replacement Considerations

Publicly confirmed substitute part numbers for this specific component were not found in the provided source material. Cross-referencing with similar LDOs requires verifying output voltage, current capacity, and package compatibility independently.