LDK120M33R

Overview

The LDK120M33R is a fixed-output linear low-dropout regulator manufactured by STMicroelectronics. It provides a fixed output voltage of 3.3V with a maximum continuous output current of 200mA. The device operates within an input voltage range of 1.9V to 5.5V and features a typical dropout voltage of 100mV at 100mA load. Key electrical specifications include a maximum quiescent current of 60µA, a shutdown current below 1µA when enabled, and a power supply rejection ratio (PSRR) of 55dB across the 120Hz to 10kHz frequency range. It is housed in a compact SOT-23-5 surface-mount package.

Feature Summary

• Ultra-low dropout performance ensures efficient regulation with minimal voltage loss between input and output.
• Low quiescent current consumption extends battery life in portable and energy-efficient electronic designs.
• Integrated protection mechanisms include thermal shutdown and constant current limiting for safe operation under fault conditions.
• Logic-controlled enable pin allows precise power management by switching the device into a deep shutdown state.

Applications

• Battery-powered portable consumer electronics
• Handheld devices requiring stable voltage regulation
• Low-noise analog circuit power supplies
• Embedded systems with strict power budget constraints

Procurement Notes

Verify the specific suffix 'M' indicates the standard tape-and-reel packaging configuration as documented by the manufacturer. Confirm that the component meets RoHS3 compliance standards required for your assembly process. Ensure the ordering quantity aligns with the standard reel size specified in the official datasheet to avoid handling discrepancies during production.

Selection Notes

Select this component when a fixed 3.3V rail is required from inputs up to 5.5V with minimal static power draw. The SOT-23-5 package suits space-constrained layouts. Consider the PSRR characteristics if noise sensitivity is critical. Verify that the thermal dissipation capabilities of the chosen PCB footprint can handle the expected power load without exceeding junction temperature limits.

Part Context

This part belongs to the LDK120 series of ultra-low dropout regulators designed for low-power applications. The series offers various fixed and adjustable output voltages. The LDK120M33R specifically targets markets needing high efficiency and low noise in a small form factor, distinguishing it from higher-current variants like the LDK320 or different package options within the same family.

Replacement Considerations

LDK120DM33R serves as a verified substitute within the same product family, offering identical electrical specifications and functionality. Both parts share the same output voltage, current rating, and package type, ensuring direct compatibility in existing designs without requiring schematic modifications.