LDK220M35R

Overview

The LDK220M35R is a low-dropout linear voltage regulator (LDO) from STMicroelectronics, providing a fixed 3.5 V output with a maximum current of 200 mA. It operates within an input voltage range of 2.5 V to 13.2 V and features a typical dropout voltage of 100 mV at 100 mA load. The device exhibits a quiescent current of 55 µA, reducing to less than 1 µA in shutdown mode via logic control. Output voltage tolerance is ±2.0% at 25 °C. It supports ceramic capacitors as small as 1 µF for stability and includes internal short-circuit constant current limiting and thermal protection mechanisms.

Feature Summary

• Logic-controlled electronic shutdown function enables ultra-low power consumption in standby states.
• Integrated thermal protection and short-circuit constant current limiting ensure robust operation under fault conditions.
• Compatible with small-value ceramic output capacitors, facilitating compact circuit board designs.

Applications

• Battery-powered portable electronic devices requiring efficient power management
• Low-noise analog circuits sensitive to supply voltage fluctuations
• Embedded systems utilizing ceramic capacitor stabilization

Procurement Notes

Verify the specific suffix M35R corresponds to the 3.5 V fixed output variant and the required packaging configuration. Confirm that the component meets the intended operating temperature range of -40 °C to 125 °C for your application environment. Ensure compatibility with the specified 1 µF minimum ceramic output capacitor requirement for stable regulation.

Selection Notes

Select this regulator when a fixed 3.5 V output is required with minimal external component count. It is suitable for applications demanding low quiescent current and high efficiency near dropout conditions. Consider its 200 mA output capability and thermal performance limits relative to the expected load profile and ambient temperature constraints.

Part Context

This component belongs to the LDK series of low-dropout regulators designed for battery-powered applications. It utilizes advanced CMOS technology to achieve low static current and noise levels. The series offers various fixed output voltages and adjustable options, catering to diverse embedded system power requirements while maintaining high accuracy and reliability.

Replacement Considerations

Consult official STMicroelectronics documentation for qualified alternative part numbers within the LDO portfolio. Verify pinout compatibility and electrical parameter equivalence before substitution. No direct substitute part numbers are confirmed in the provided reference data.