LD39150PT-R

Overview

The LD39150PT-R is a fast ultra-low dropout linear regulator from STMicroelectronics, operating with an input supply range of 2.5 V to 6 V. It delivers a guaranteed output current of 1.5 A and features ultra-low dropout voltage, specifically 200 mV typical at 1.5 A load and 40 mV typical at 300 mA load. The device exhibits very low quiescent current, reaching 1 μA maximum in off mode at 25 °C. It offers fixed output voltages including 1.8 V, 2.5 V, 3.3 V, and an adjustable option, with ±1.5% output voltage tolerance at 25 °C. Designed on a BiCMOS process, it ensures stable operation with ceramic capacitors and includes logic-controlled electronic shutdown, current limiting, and thermal protection within the -40 to 125 °C temperature range.

Feature Summary

• Ultra-low dropout voltage performance enables efficient regulation under heavy loads
• Logic-controlled electronic shutdown minimizes power consumption in standby modes
• BiCMOS process technology maintains low quiescent current independent of load conditions
• Integrated current and thermal limits provide robust internal protection

Applications

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

Procurement Notes

Verify the specific suffix 'PT' against official STMicroelectronics documentation to confirm the exact package type and tape-and-reel specifications. Ensure the selected output voltage variant matches the required system design parameters. Cross-reference the manufacturing date code and RoHS compliance status with the latest distributor data sheets before finalizing procurement orders.

Selection Notes

Select this component when designing systems requiring high output current up to 1.5 A with minimal voltage drop across the regulator. The wide input voltage range supports various battery chemistries. Consider the available fixed voltage options or the adjustable version for custom requirements. Verify that the application environment stays within the specified -40 to 125 °C operating temperature range for optimal reliability.

Part Context

The LD39150 belongs to a family of fast ultra-low dropout linear regulators designed for low-noise and low-power applications. This series utilizes BiCMOS technology to achieve superior performance characteristics compared to standard CMOS LDOs. The PT suffix typically denotes a specific surface-mount package configuration, distinguishing it from other variants like DPAK or DFN6 within the same functional family.

Replacement Considerations

Direct substitutes may include other STMicroelectronics LDOs from the LD39xxx series with compatible pinouts and electrical ratings. Verify equivalent dropout voltage, current capacity, and package dimensions before swapping components. Consult official cross-reference guides for confirmed interchangeable part numbers.