LD56050DPU105R

Overview

The LD56050DPU105R is a fixed-output linear regulator from STMicroelectronics providing a stable 1.05V output with a maximum current of 500mA. It operates within an input voltage range of 0.8V to 5.5V and features an ultra-low dropout voltage of 250mV at full load. The device incorporates a dedicated bias supply pin for enhanced performance, maintaining a typical quiescent current of 40µA. It includes logic-controlled shutdown consuming less than 0.1µA, thermal protection, and short-circuit current foldback. Packaged in a compact 4-DFN (1.2x1.2mm) surface-mount format, it supports operation between -40°C and 85°C junction temperature.

Feature Summary

• Ultra-low dropout performance enabled by NMOS pass transistor with dedicated bias supply pin
• Logic-controlled electronic shutdown function for minimal power consumption
• Integrated thermal shutdown and internal current limit with foldback protection

Applications

• Low power battery-operated applications
• Personal electronics requiring space-saving designs
• Systems utilizing small ceramic capacitors for output stabilization

Procurement Notes

Verify the specific suffix 'DPU105R' corresponds to the 1.05V fixed output variant when sourcing. Confirm package integrity for the 4-DFN 1.2x1.2mm form factor. Ensure compatibility with RoHS3 standards if required by your manufacturing process. Cross-reference datasheet revision dates to confirm feature consistency regarding bias supply requirements.

Selection Notes

Select this component when designing circuits that require precise low-voltage regulation under varying input conditions. The dedicated bias pin necessitates proper external circuitry integration to achieve the specified ultra-low dropout characteristics. Consider the 40µA quiescent current impact on overall system efficiency during active operation versus the sub-0.1µA consumption in shutdown mode.

Part Context

This part belongs to the LD56050 series of ultra-low dropout linear regulators designed for high accuracy and space-constrained environments. The series utilizes an NMOS pass element biased by a dedicated pin to minimize voltage drop. Other variants in the family offer different fixed output voltages while sharing the same compact DFN4 packaging and protection features.

Replacement Considerations

Direct substitutes include other LD56050 variants with different fixed output voltages, such as LD56050DPU110R, provided the voltage requirement differs. Verify that replacement parts maintain the same 4-DFN footprint and bias supply pin functionality to ensure circuit compatibility without redesign.