LDK120C33R

Overview

The LDK120C33R is a low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides a fixed output voltage of 3.3 V with a maximum output current capability of 200 mA. The device operates within an input supply voltage range of 1.9 V to 5.5 V and features a typical dropout voltage of 100 mV at a 100 mA load. It maintains stability when used with a ceramic capacitor on the output. The quiescent current is specified at a maximum of 100 µA, reducing to less than 1 µA in shutdown mode. The unit supports operation across a temperature range from -40 °C to +125 °C.

Feature Summary

• Logic-controlled electronic shutdown function for ultra-low power consumption
• Internal constant current limiting and thermal protection mechanisms
• Compatible with ceramic output capacitors for stable regulation

Applications

• Low-power battery-powered consumer electronics
• Portable devices requiring efficient voltage regulation
• Embedded systems utilizing ARM Cortex-M microcontrollers

Procurement Notes

Verify the specific package type against design requirements, as the LDK120 series is available in SOT23-5L, SOT323-5L, and DFN6 configurations. Confirm that the fixed 3.3 V output aligns with system voltage rails. Ensure the PCB layout supports the required ceramic output capacitance for stability. Check for RoHS compliance documentation if environmental regulations apply to the final assembly.

Selection Notes

Select this component when a fixed 3.3 V rail is needed with minimal external components. The low quiescent current makes it suitable for battery-operated applications where standby power is critical. Consider the thermal performance under maximum load conditions. Verify that the input voltage remains within the 1.9 V to 5.5 V operational window during all operating states.

Part Context

This part belongs to the LDK120 family of low-dropout regulators designed for low noise and low power applications. The family includes adjustable versions and various fixed output voltages. These regulators are intended for portable electronics and IoT devices. The series emphasizes high PSRR and fast transient response capabilities.

Replacement Considerations

Check for direct pin-compatible alternatives within the same LDK120 series offering different output voltages or packages. Verify electrical specifications match exactly before substitution.