LD56050DPU100R

Overview

The LD56050DPU100R is a high-accuracy linear regulator providing a fixed 1.00 V output with a guaranteed 500 mA current capability. It operates within an input voltage range of 0.8 V to 5.5 V and features an ultra-low dropout voltage of 80 mV typical at full load. The device incorporates a dedicated bias supply pin for NMOS pass transistor gate driving, enabling operation at very low input voltages. It includes logic-controlled electronic shutdown consuming less than 0.1 µA, internal current limiting with foldback, thermal shutdown, and an active output discharge function.

Feature Summary

• Ultra-low dropout performance enabled by a dedicated bias supply pin for the NMOS pass transistor
• Logic-controlled electronic shutdown mode with total current consumption lower than 0.1 µA
• Integrated short-circuit protection utilizing current foldback and thermal shutdown mechanisms
• Active output discharge function that rapidly discharges the output capacitor upon disable

Applications

• Mobile phones
• Tablets
• Battery-powered systems
• Camera supply

Procurement Notes

Verify the specific ordering suffix DPU100R to confirm the 1.00 V fixed output voltage and integrated output discharge functionality. Ensure the procurement documentation references STMicroelectronics as the manufacturer and confirms compliance with the ECOPACK environmental specifications. Cross-reference the datasheet revision DS12441 Rev 2 for accurate electrical characteristics and application circuit requirements.

Selection Notes

Select this component when a compact 1.2 x 1.2 mm footprint is required alongside high accuracy and low quiescent current. The dedicated bias pin allows flexibility in power architecture design, particularly where input voltage margins are tight. Verify that the external ceramic capacitors meet the stability requirements regarding capacitance and ESR across the operating temperature range.

Part Context

This part belongs to the LD56050 family of 500 mA ultra-low dropout linear regulators manufactured by STMicroelectronics. The series is characterized by its ability to maintain regulation at minimal voltage differentials between input and output. Other variants in the family offer different fixed output voltages ranging from 0.8 V to 3.6 V in 50 mV steps, all sharing the same package and core protection features.

Replacement Considerations

LD56050DPU105R

FAQ

How does the LD56050 handle short circuits?

The device employs an internal current limit with foldback protection. When the output voltage drops significantly due to a short circuit, the current limit reduces to a lower short-circuit current level to protect the device.

What is the purpose of the VBIAS pin?

The VBIAS pin supplies the internal driving and control circuitry. It ensures proper biasing of the N-channel power element, allowing the regulator to achieve ultra-low dropout performance even at very low input voltages.