LDK220U33R

Overview

The LDK220U33R is a fixed-output linear voltage regulator manufactured by STMicroelectronics, providing a stable 3.3V output with a maximum current capacity of 200mA. It operates within an input voltage range of 2.5V to 13.2V and features a typical dropout voltage of 100mV at 100mA load. The device incorporates low quiescent current consumption of 90µA and includes logic-controlled enable functionality for shutdown modes. Protection mechanisms include overcurrent limiting and thermal shutdown, ensuring reliability across an operating temperature range of -40°C to +125°C in a SOT-89 surface-mount package.

Feature Summary

• Logic-controlled electronic shutdown function enables deep sleep mode with ultra-low standby current consumption
• Compatible with small ceramic output capacitors, simplifying circuit design and reducing board space requirements
• Integrated short-circuit constant current limiting and thermal protection safeguards against overload conditions

Applications

• Battery-powered portable electronic devices requiring efficient power management
• Low-noise analog circuits sensitive to power supply fluctuations
• Embedded systems utilizing ceramic capacitor stabilization for compact form factors

Procurement Notes

Verify the specific suffix 'U33R' corresponds to the 3.3V fixed output variant and SOT-89 packaging configuration. Confirm RoHS3 compliance status and ensure the ordering part number matches the required tape-and-reel or cut-tape format for your assembly process. Cross-reference the manufacturer datasheet for any recent pinout or electrical specification updates before finalizing procurement.

Selection Notes

Select this component when a fixed 3.3V rail is needed with minimal external components due to ceramic capacitor compatibility. The low quiescent current makes it suitable for battery-operated applications where standby power drain is critical. Ensure the input voltage remains within the 2.5V to 13.2V range and that the thermal environment supports the specified junction temperature limits for reliable operation.

Part Context

This device belongs to the LDK220 family of low-dropout linear regulators designed for high efficiency and low noise performance. The family offers various output voltages and packages, including SOT23-5L, SOT323-5L, and DFN6, catering to diverse space-constrained designs. The LDK220U33R specifically targets applications requiring a robust 3.3V supply with integrated protection features in a standard SOT-89 footprint.

Replacement Considerations

Consult official STMicroelectronics documentation for verified cross-reference part numbers. Ensure any substitute maintains identical output voltage, current rating, package type, and pinout configuration to guarantee functional compatibility without redesigning the PCB layout.