LDK120M30R

Overview

The LDK120M30R is a low-dropout linear voltage regulator manufactured by STMicroelectronics, designed for low-power battery-operated applications. It delivers a maximum output current of 200 mA with an input voltage range spanning from 1.9 V to 5.5 V. The device features a typical dropout voltage of 100 mV at a 100 mA load and maintains a low quiescent current of up to 100 μA. In shutdown mode, total current consumption drops below 1 μA via logic-controlled enable. It offers very low noise characteristics and is stabilized using a ceramic capacitor on the output. The adjustable version allows output voltages ranging from 0.8 V to VIN minus the dropout voltage. Internal protections include constant current limiting for short circuits and thermal protection. The component operates within a temperature range of -40 °C to +125 °C and is housed in a SOT-323-5L surface-mount package.

Feature Summary

• Ultra-low dropout voltage capability ensures efficient power regulation under varying load conditions.
• Very low noise performance supports sensitive analog and RF circuit requirements.
• Logic-controlled electronic shutdown minimizes power consumption in standby states.
• Integrated short-circuit and thermal protection mechanisms enhance device reliability.

Applications

• Low-power battery-powered portable electronics
• Wireless sensor nodes requiring minimal quiescent current
• Noise-sensitive analog signal conditioning circuits

Procurement Notes

Verify the specific suffix 'M30R' against official STMicroelectronics documentation to confirm exact packaging configuration and reel specifications. Ensure compatibility with SOT-323-5L footprint designs. Confirm RoHS compliance status through the manufacturer's latest environmental declaration before integration into production.

Selection Notes

Select this component when designing systems that require stable regulation from lithium-ion or similar single-cell batteries. The adjustable output feature provides flexibility for custom voltage rails. Consider the 100 μA quiescent current impact on overall system efficiency during active operation versus the sub-1 μA shutdown current for sleep modes.

Part Context

This part belongs to the LDK120 series of low-dropout regulators from STMicroelectronics. The series is characterized by high performance in terms of noise and dropout voltage while maintaining low static current consumption. It serves as a power management solution for embedded systems where space constraints and power efficiency are critical design parameters.

Replacement Considerations

Consult STMicroelectronics documentation for direct pin-compatible alternatives within the LDK120 family. Verify electrical parameter equivalence for input voltage range and output current capacity before substituting with other manufacturers' LDOs.

FAQ

What type of output capacitor is required for stability?

The LDK120M30R is stabilized with a ceramic capacitor on the output, specifically compatible with a COUT of 1 μF.

How does the device handle short-circuit conditions?

The device includes internal constant current limiting and thermal protection to safeguard against short circuits and overheating.