LDK220C50R

Overview

The LDK220C50R is a fixed-output linear low-dropout regulator manufactured by STMicroelectronics. It provides a fixed 5V output with a maximum current of 200mA. The device operates from an input voltage range of 2.5V to 13.2V, featuring a typical dropout voltage of 100mV at 100mA load. Key electrical characteristics include a quiescent current of 90µA and power supply rejection ratio (PSRR) ranging from 55dB to 50dB between 120Hz and 10kHz. It incorporates enable logic control for shutdown modes with consumption below 1µA, alongside internal overcurrent and thermal protection mechanisms.

Feature Summary

• Logic-controlled electronic shutdown function enables deep sleep mode with ultra-low standby current consumption
• Integrated short-circuit constant current limiting and thermal protection safeguards against overload conditions
• Compatible with small ceramic output capacitors, specifically stabilizing with 1µF components

Applications

• Battery-powered portable equipment requiring extended operational life
• Low-noise analog circuit power supplies
• Embedded systems utilizing logic-controlled power management

Procurement Notes

Verify the specific package variant SOT-323-5L matches your PCB footprint requirements. Confirm that the fixed 5V output aligns with your system design needs, as adjustable versions exist within the LDK220 family. Ensure input voltage remains within the 2.5V to 13.2V range during operation. Check RoHS3 compliance status if required by your manufacturing standards. Validate thermal dissipation capabilities based on your expected load current and ambient temperature conditions.

Selection Notes

Select this component when a fixed 5V rail is required with minimal board space due to the compact SOT-323-5L package. Choose this part over adjustable regulators if system stability with standard ceramic capacitors is prioritized. Consider the low quiescent current specification for battery-operated devices where standby power drain is critical. Evaluate the dropout voltage performance relative to your minimum input voltage constraints under full load conditions.

Part Context

This device belongs to the LDK220 series of low-dropout linear regulators designed for low-power applications. The series offers various output voltages and packages, including SOT23-5L, SOT-89, and DFN6. The LDK220C50R specifically denotes the 5V fixed output version in the SOT-323-5L package. This family emphasizes low noise and low static current for efficient power management in portable electronics.

Replacement Considerations

Consult official substitution lists for equivalent packages or voltage options within the LDK220 series. Verify pin compatibility before replacing with other LDO regulators from different manufacturers. Ensure thermal and electrical specifications meet or exceed original design requirements.