LD39300PT25-R

Overview

The LD39300PT25-R is a fixed-output ultra-low dropout linear regulator manufactured by STMicroelectronics. It provides a stable 2.5V output voltage with a guaranteed maximum load current of 3A. The device operates from an input supply range of 2.5V to 6V and features logic-controlled electronic shutdown capability. Key electrical characteristics include a typical dropout voltage of 40mV at 600mA load and 200mV at 3A load, alongside a quiescent current of 1.2mA in active mode. The unit maintains ±1.5% output voltage tolerance at 25°C and functions within a temperature range of -40°C to 125°C.

Feature Summary

• Ultra-low dropout performance ensures high efficiency under heavy load conditions
• Logic-controlled inhibit pin enables precise power management and deep sleep modes
• Integrated thermal and current limiting protects against overload scenarios
• Compatible with ceramic output capacitors for compact board design

Applications

• Microprocessor power supply
• DSPs power supply
• Post regulators for switching supplies
• High efficiency linear regulator

Procurement Notes

Verify the specific suffix 'PT25-R' corresponds to the PPAK package and 2.5V fixed output configuration as listed in the official order codes. Confirm that the procurement channel sources genuine STMicroelectronics components. Ensure the received units match the ECOPACK lead-free specifications documented in the datasheet. Cross-reference the part number against the manufacturer's latest documentation to confirm availability and revision status before finalizing orders.

Selection Notes

Select this component when a fixed 2.5V rail is required with up to 3A continuous current capability. The PPAK package offers a compact footprint suitable for space-constrained designs compared to the DPAK alternative. Consider the low quiescent current and fast dynamic response for applications sensitive to power consumption and transient stability. Ensure the input voltage remains within the 2.5V to 6V operating range to maintain regulation.

Part Context

This device belongs to the LD39300 family of ultra-low drop BICMOS voltage regulators. The family includes various fixed output voltages (1.22V, 1.8V, 3.3V) and an adjustable version. The PT suffix indicates the PPAK surface-mount package, while DT denotes the DPAK package. All variants share identical electrical performance characteristics, differing only in output voltage setting and physical packaging dimensions.

Replacement Considerations

The LD39300DT25-R serves as a direct functional substitute using the DPAK package instead of PPAK. Other fixed voltage variants within the LD39300 series may replace this unit if the system requires a different output voltage level, provided the pinout and electrical specifications remain compatible with the existing circuit design.