LD39130SJ25R

Overview

The LD39130SJ25R is a fixed-output low-dropout linear regulator from STMicroelectronics, providing a stable 2.5 V output with a maximum current capacity of 300 mA. It operates within an input voltage range of 1.4 V to 5.5 V and features a typical dropout voltage of 300 mV at full load. The device exhibits a quiescent current of 45 µA and offers high power supply rejection ratio (PSRR) of 70 dB. Designed for space-constrained applications, it utilizes a compact 4-bump FlipChip package measuring 0.69 x 0.69 mm. It includes internal protection mechanisms such as overcurrent limiting and thermal shutdown, ensuring reliable operation across a temperature range of -40 °C to +125 °C.

Feature Summary

• Ultra-compact 4-bump FlipChip packaging designed for significant board space reduction in portable electronics.
• Integrated automatic Green Mode that dynamically switches between ultra-low power standby and normal operation based on load demand.
• High precision voltage regulation with tight tolerance accuracy to ensure stable power delivery to sensitive loads.
• Built-in safety features including electronic enable control, soft-start functionality, and thermal/overcurrent protection.

Applications

• Battery-powered consumer electronics requiring extended operational life
• Portable medical devices needing precise voltage regulation
• Wearable technology with strict size and weight constraints
• IoT sensor nodes utilizing low quiescent current architectures

Procurement Notes

Verify the specific suffix 'J' confirms the 2.5 V fixed output and FlipChip package configuration against the official datasheet. Confirm RoHS compliance status and check for end-of-life notices or obsolescence warnings prior to finalizing procurement plans. Ensure compatibility with existing PCB footprint designs for the 4-bump CSP package.

Selection Notes

Select this component when a fixed 2.5 V rail is required with minimal footprint and low static current consumption. It is suitable for applications where input voltages vary between 1.4 V and 5.5 V. Consider alternative packages if the FlipChip form factor is incompatible with the manufacturing process. Evaluate thermal performance under maximum load conditions to ensure adequate heat dissipation.

Part Context

This part belongs to the LD39130S family of ultra-low dropout regulators known for their high accuracy and low noise characteristics. The series is engineered for battery-operated systems, offering various fixed output voltages and adjustable options. The SJ variant specifically denotes the FlipChip package option, distinguishing it from DFN6 versions within the same electrical specification family.

Replacement Considerations

LP3991TL-2.5/NOPB by Texas Instruments is documented as a potential substitute. Verify pinout compatibility and electrical parameter alignment before implementation.

FAQ

What is the typical dropout voltage of the LD39130SJ25R?

The typical dropout voltage is 300 mV when operating at a 300 mA load.

Does the LD39130SJ25R support ceramic output capacitors?

Yes, the device is stabilized with ceramic capacitors on the output, typically requiring 330 nF for stability.

How does the Green Mode feature benefit the circuit?

Green Mode automatically reduces quiescent current to approximately 1 µA during light load conditions, extending battery life in portable devices.