LD3985J25R

Overview

The LD3985J25R is a fixed positive low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides a stable 2.5 V output with a maximum guaranteed load current of 150 mA. The device operates within an input voltage range of 2.5 V to 6 V and features an ultra-low dropout voltage, typically 0.06 V at full load. Designed for surface-mount applications, it utilizes a five-pin BGA package (VFBGA, BGA5,3X3,17/10). The regulator maintains operation across a wide temperature range from -40 °C to +125 °C.

Feature Summary

• Ultra-low dropout voltage performance ensures efficient power delivery in battery-powered systems.
• Logic-controlled electronic shutdown function minimizes standby power consumption.
• Compatible with low ESR ceramic capacitors for compact circuit design.
• Integrated internal current limiting and thermal protection safeguards against overload.

Applications

• Mobile phones
• Battery-powered wireless systems
• Personal digital assistants

Procurement Notes

Verify the specific package designation upon ordering, as datasheets may reference VFBGA or BGA5 formats interchangeably. Confirm that the J suffix corresponds to the required packaging configuration for your assembly line. Ensure compatibility with standard reflow soldering profiles for the specified five-terminal surface-mount footprint.

Selection Notes

Select this component when a fixed 2.5 V rail is required with moderate current demands up to 150 mA. It is suitable for designs prioritizing low quiescent current and noise reduction. Verify that the input voltage remains above the minimum threshold to prevent dropout during peak load conditions.

Part Context

This part belongs to the LD3985 series of BiCMOS voltage regulators. The series is characterized by low noise and high power supply rejection ratios. The J variant specifically denotes the fixed 2.5 V output version housed in a small form-factor BGA package, distinguishing it from other pin-out configurations in the family.

Replacement Considerations

The LD3985M33R serves as a functional substitute within the same series, offering identical electrical characteristics but providing a fixed 3.3 V output instead of 2.5 V. Designers must verify that the system logic levels accommodate the higher voltage before swapping these components.

FAQ

What is the typical dropout voltage at full load?

The typical dropout voltage is 0.06 V when the device is supplying its maximum rated current of 150 mA.

Does the device support electronic shutdown?

Yes, the LD3985J25R includes a logic-controlled electronic shutdown feature to reduce power consumption in standby modes.