LD39115J28R

Overview

The LD39115J28R is a low-dropout linear voltage regulator from STMicroelectronics, providing a fixed output voltage of 2.8 V with a maximum load current of 150 mA. It operates within an input voltage range of 1.5 V to 5.5 V and features a typical dropout voltage of 80 mV at 100 mA. The device exhibits very low quiescent current, typically 20 μA at no load and 35 μA at full load, with shutdown consumption below 1 μA. Noise performance is specified at 33 μV RMS between 1 kHz and 100 kHz. It includes logic-controlled enable functionality, short-circuit protection, and thermal shutdown, housed in a compact 4-bump flip-chip package.

Feature Summary

• Ultra-low dropout voltage capability for efficient power management in battery-powered systems
• Very low quiescent current consumption extending operational battery life
• Low noise output suitable for sensitive analog and RF circuits
• Integrated protection mechanisms including constant current limiting and thermal shutdown

Applications

• Low-power battery-operated portable devices
• RF modules requiring clean power supply rails
• Wearable electronics with strict size constraints
• IoT sensor nodes utilizing ceramic capacitors

Procurement Notes

Verify the specific suffix '28R' confirms the 2.8 V fixed output variant during procurement. Confirm package compatibility with the 4-bump flip-chip footprint. Check for NRND status or lifecycle changes as availability may vary by region. Ensure design-in documentation matches the exact electrical specifications for the 2.8 V version.

Selection Notes

Select this component when a fixed 2.8 V rail is required with minimal board space due to the flip-chip package. Consider the low noise specification if powering RF sections. Verify that the input voltage remains above the dropout threshold under all load conditions. Ensure the application supports the use of ceramic output capacitors for stability.

Part Context

This part belongs to the LD39115 family of ultra-low dropout regulators designed for high efficiency and low noise. The 'J' indicates the flip-chip package option, while '28' specifies the 2.8 V output voltage. The family is characterized by its ability to operate with small ceramic capacitors, simplifying BOM and reducing overall solution size compared to older LDO technologies.

Replacement Considerations

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