LDK715M50R

Overview

The LDK715M50R is a high-voltage, ultra-low quiescent current, and low-drop linear regulator manufactured by STMicroelectronics. It provides a fixed output voltage of 5 V with an output current capability exceeding 85 mA. The device operates over an input voltage range from 4.3 V to 24 V and remains stable when used with ceramic output capacitors. Key electrical specifications include a typical quiescent current of 5 μA at full load, a typical dropout voltage of 500 mV at 85 mA, and a maximum power dissipation of 450 mW. It features internal short-circuit current limitation for fault protection.

Feature Summary

• Ultra-low quiescent current of 5 μA at full load, optimizing efficiency in battery-powered systems.
• High input voltage tolerance up to 24 V, suitable for industrial applications with wide supply variations.
• Compatible with small ceramic output capacitors ranging from 0.47 μF to 10 μF, reducing board space requirements.

Applications

• Low-power industrial applications requiring stable regulation across wide input ranges
• Battery-powered systems where minimizing standby current consumption is critical
• Embedded electronics needing compact power management solutions with ceramic capacitor compatibility

Procurement Notes

Verify the specific suffix 'M50R' against the official STMicroelectronics datasheet to confirm the fixed 5.0 V output voltage and SOT-23-5 package configuration. Ensure that the ordering part number matches the required temperature range of -40 °C to +125 °C. Confirm availability status as active or obsolete before finalizing procurement plans.

Selection Notes

Select this component when a fixed 5 V output is required with high input voltage support up to 24 V. It is appropriate for designs prioritizing low static current consumption and stability with ceramic capacitors. Consider the SOT-23-5 package constraints regarding thermal dissipation and physical footprint compared to alternative packages like DFN8.

Part Context

The LDK715 series belongs to STMicroelectronics' portfolio of low-dropout linear regulators designed for high-voltage and low-power applications. This family includes variants with different output voltages such as 3.3 V and 4.2 V, sharing common features like internal current limiting and ceramic capacitor stability. The M50R variant specifically denotes the 5.0 V fixed output version within this lineup.

Replacement Considerations

The ST715 series serves as a functional replacement offering similar performance but with a lower minimum input voltage of 2.5 V instead of 4.3 V. Verify pinout compatibility between SOT-23-5 packages and ensure the application does not require the specific 4.3 V minimum input threshold of the LDK715.