LD39150PT25-R

Overview

The LD39150PT25-R is a fast ultra-low dropout linear regulator from STMicroelectronics, operating within an input supply range of 2.5 V to 6 V. It provides a fixed 2.5 V output with a guaranteed maximum load current of 1.5 A. The device features an ultra-low dropout voltage of 40 mV typical at 300 mA and 200 mV typical at 1.5 A. Quiescent current is very low, specified at 1 mA typical under full load and a maximum of 1 μA in off mode at 25 °C. Output voltage tolerance is ±1.5% at 25 °C. It includes logic-controlled electronic shutdown, internal current limiting, and thermal protection. The component operates across a temperature range of -40 °C to +125 °C and is stable with ceramic capacitors.

Feature Summary

• Ultra-low dropout performance ensures efficient regulation at minimal voltage differentials.
• Logic-controlled electronic shutdown enables precise power management with negligible standby consumption.
• Integrated current and thermal limits provide robust protection against overload conditions.

Applications

• Low voltage microprocessor power supplies
• Memory circuit powering
• Battery-powered portable devices

Procurement Notes

Verify the specific package designation for the LD39150PT25-R variant, as official documentation lists TO-252-3 (DPAK) and DFN6 options. Confirm that the suffix corresponds to the required reel or cut tape packaging format. Ensure compatibility with surface mount assembly processes. Cross-reference the manufacturer part number with authorized distributor catalogs to confirm availability and compliance status.

Selection Notes

Select this regulator when high efficiency is critical due to tight input-output voltage margins. The 1.5 A output capability supports moderate load requirements without external pass transistors. The adjustable quiescent current via shutdown pin makes it suitable for systems requiring extended battery life. Verify that the application environment remains within the specified -40 °C to +125 °C junction temperature range.

Part Context

This component belongs to the LD39150 series of ultra-low dropout regulators developed on a BiCMOS process. The series offers various fixed and adjustable output voltages, including 1.8 V, 2.5 V, 3.3 V, and ADJ versions. The technology allows low quiescent current operation independent of the output load current, distinguishing it from standard CMOS LDOs.

Replacement Considerations

Compatible substitutes include other variants within the LD39150 family, such as LD39150DT25-R or LD39150PU25-R, depending on the required package type. Ensure the replacement maintains the same 2.5 V fixed output and 1.5 A current rating.