LD56050DPU120R

Overview

The LD56050DPU120R is a high-accuracy linear voltage regulator from STMicroelectronics, delivering a fixed 1.2V output at up to 500mA. It utilizes an NMOS pass transistor biased by a dedicated pin to achieve ultra-low dropout performance, even at low input voltages. The device operates within an input voltage range of 0.8V to 5.5V and features a compact DFN4 1.2x1.2mm package. Key electrical characteristics include a maximum dropout voltage of 120mV at full load and a typical quiescent current of 27μA. It incorporates logic-controlled shutdown with consumption below 0.1μA, thermal protection, and short-circuit current foldback.

Feature Summary

• Ultra-low dropout performance enabled by a dedicated bias supply pin for the NMOS pass transistor gate
• Logic-controlled electronic shutdown function allowing total current consumption lower than 0.1 µA
• Internal protection mechanisms including thermal shutdown and short-circuit current foldback
• Output active discharge function to rapidly remove charge from the output capacitor

Applications

• Low power battery-operated applications requiring extended runtime
• Personal electronics with strict space constraints due to small package size
• Portable devices utilizing low input voltage sources

Procurement Notes

Verify the specific suffix 'DPU120R' against official STMicroelectronics documentation to confirm the fixed 1.2V output voltage and tape-and-reel packaging configuration. Ensure compatibility with the required 4-DFN 1.2x1.2mm footprint and check for any recent product change notices regarding lead or material composition updates.

Selection Notes

Select this component when a fixed 1.2V rail is needed with minimal voltage drop across the regulator. The dedicated bias pin allows operation with input voltages very close to the output level. Consider the DFN4 package for board space optimization and verify that the application can support the required ceramic output capacitance for stability.

Part Context

This part belongs to the LD56050 family of ultra-low dropout linear regulators designed for high accuracy and low power consumption. The series is characterized by its ability to maintain regulation under light loads while offering robust protection features. The DFN4 package variant provides a compact solution suitable for dense PCB layouts in modern portable electronics.

Replacement Considerations

Direct substitutes within the same family include other LD56050 variants with different output voltages (e.g., LD56050DPU105R for 1.05V or LD56050DPU110R for 1.1V) if the voltage requirement differs. Verify pinout and package dimensions remain identical before substitution.