LD39015M12R

Overview

The LD39015M12R is a fixed-output linear voltage regulator from STMicroelectronics, providing a stable 1.2 V output with a maximum current capability of 150 mA. It operates within an input voltage range of 1.5 V to 5.5 V and features a typical dropout voltage of 80 mV at a 100 mA load. The device exhibits very low quiescent current, typically 18 μA at no load and 38 μA at full load, while maintaining a shutdown current lower than 1 μA when enabled via logic control. It offers high power supply rejection of 65 dB at low frequencies and ensures output voltage tolerance of ±2.0% at 25 °C. Designed for stability with ceramic capacitors, it includes internal short-circuit constant current limiting and thermal protection, functioning reliably across a temperature range of -40 °C to 125 °C.

Feature Summary

• Ultra-low dropout voltage operation suitable for battery-powered systems
• Logic-controlled electronic shutdown for extended standby life
• Internal short-circuit constant current limiting and thermal protection
• Stable with small ceramic output capacitors

Applications

• Mobile phones
• Personal digital assistants (PDAs)
• Cordless phones
• Battery-powered portable systems

Procurement Notes

Verify the specific suffix 'M12R' corresponds to the 1.2 V fixed output variant in the SOT-23-5 package. Confirm that the ordering code matches the required tape-and-reel quantity specifications. Ensure compatibility with the intended PCB footprint for the SC-74A or SOT-753 package style. Cross-reference the manufacturer part number against official STMicroelectronics databases to validate active status and availability before finalizing procurement orders.

Selection Notes

Select this component when designing low-power circuits requiring a precise 1.2 V rail from a single-cell lithium-ion or similar battery source. The low quiescent current makes it ideal for extending battery life in portable devices. Ensure the application environment stays within the specified -40 °C to 125 °C operating temperature range. Verify that the input voltage never exceeds the 5.5 V maximum limit during transient conditions.

Part Context

This part belongs to the LD39015 series of low-dropout regulators designed for mobile and handheld applications. The series emphasizes low noise and low current consumption to support sensitive analog and RF sections in portable electronics. The M12R designation specifically indicates the 1.2 V output version packaged in a compact surface-mount format, distinguishing it from other voltage options within the same family.

Replacement Considerations

Direct substitutes include other 1.2 V, 150 mA LDOs with similar low quiescent current profiles. Verify pinout compatibility and thermal performance characteristics before swapping. Check if alternative packages are available for the same regulatory requirements.