LDK220M33R

Overview

The LDK220M33R is a fixed-output linear voltage regulator from 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 characteristics, typically 55µA, which reduces to less than 1µA in shutdown mode via logic-controlled enable. It includes internal short-circuit constant current limiting and thermal protection mechanisms.

Feature Summary

• Logic-controlled electronic shutdown function enables deep sleep modes for extended battery life
• Compatible with small ceramic output capacitors, simplifying board layout and reducing component count
• Integrated protection against overcurrent conditions and excessive junction temperature

Applications

• Battery-powered portable electronic devices requiring efficient power management
• Embedded systems utilizing low-noise power supplies for sensitive analog circuits
• General-purpose voltage regulation in handheld consumer electronics

Procurement Notes

Verify the specific suffix 'M33R' corresponds to the 3.3V fixed output variant and SOT-23-5 package configuration. Confirm that the ordering code matches the required tape-and-reel packaging format if automated assembly is intended. Cross-reference the manufacturer part number with official STMicroelectronics documentation to ensure compatibility with design specifications.

Selection Notes

Select this component when a fixed 3.3V rail is required with minimal external components. The low dropout characteristic allows operation from sources close to the output voltage. Ensure the application benefits from the low quiescent current profile and that the 200mA output current meets the load requirements without exceeding thermal limits under worst-case ambient conditions.

Part Context

This device belongs to the LDK220 series of low-dropout regulators designed for low-power applications. The series offers various fixed output voltages and adjustable options, packaged in compact formats such as SOT-23-5L and DFN6. These regulators are engineered for high efficiency in space-constrained designs where noise performance and standby current consumption are critical factors.

Replacement Considerations

Consult STMicroelectronics documentation for direct pin-compatible alternatives within the LDK220 family offering different fixed output voltages or alternative packages like SOT-323-5L. Verify electrical parameter equivalence before substituting with other manufacturers' LDOs to ensure compatibility with existing circuit constraints.