LDK220M40R

Overview

The LDK220M40R is a fixed linear voltage regulator from STMicroelectronics, providing a stable 4V output with a maximum current of 200mA. It operates within an input voltage range of 2.5V to 13.2V and features a typical dropout voltage of 200mV at full load. The device incorporates low quiescent current characteristics, with a maximum supply current of 100µA, enhancing efficiency in battery-powered applications. It includes comprehensive protection mechanisms such as overcurrent limiting and thermal shutdown. Packaged in a compact SOT-23-5 surface-mount case, it supports operation across a wide temperature range from -40°C to +125°C.

Feature Summary

• Provides fixed 4V output with 200mA continuous current capability
• Features ultra-low quiescent current for extended battery life
• Includes integrated overcurrent and thermal overload protection
• Operates reliably across industrial temperature ranges

Applications

• Portable consumer electronics requiring stable low-voltage rails
• Battery-operated devices needing efficient power management
• Embedded systems utilizing microcontrollers or sensors
• Industrial control modules requiring robust regulation

Procurement Notes

Verify the specific suffix 'M40R' corresponds to the 4V fixed output variant when sourcing. Confirm package type is SOT-23-5 (SC-74A) for PCB layout compatibility. Ensure environmental compliance requirements match RoHS3 standards if applicable. Cross-reference manufacturer datasheets for exact pinout definitions to prevent installation errors during assembly processes.

Selection Notes

Select this component when a precise 4V rail is required with minimal static power consumption. Consider the 200mA output limit against peak load demands to avoid triggering current protection. Evaluate thermal dissipation capabilities given the small SOT-23-5 footprint under high ambient temperatures. Compare line and load regulation specifications against sensitive downstream circuitry requirements.

Part Context

This part belongs to the LDK220 series of low-dropout regulators designed for general-purpose PMIC applications. The series offers various fixed output voltages while maintaining consistent performance metrics like low noise and high PSRR. It targets markets demanding reliable voltage regulation in space-constrained designs without compromising on electrical stability or protection features.

Replacement Considerations

Direct substitutes must match the 4V output, 200mA current rating, and SOT-23-5 package. Verify equivalent quiescent current and dropout voltage characteristics to ensure system performance parity. Check for compatible pinouts to facilitate drop-in replacement without redesigning the host PCB layout.