MIC4685WR-TR

Voltage Regulators - DC DC Switching Regulators Overview

The MIC4685WR-TR is a high-efficiency 200kHz step-down switching regulator manufactured by Microchip Technology. It delivers 3A of continuous output current within a compact 7-pin SPAK package. The device operates with an input voltage range of 4V to 30V, accommodating 34V transients. Power conversion efficiency exceeds 85% across a wide load range. It integrates over-current protection, frequency-foldback short-circuit protection, and thermal shutdown for enhanced safety.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates boost capacitor technology to maintain high efficiency over a wide output current range by increasing voltage available to saturate the internal power switch.
• Features built-in safety mechanisms including over-current protection, frequency-foldback short-circuit protection, and thermal shutdown.
• Utilizes 7-pin SPAK packaging that offers a significantly smaller footprint compared to traditional TO-263 packages while providing comparable thermal performance.

Voltage Regulators - DC DC Switching Regulators Applications

• Applications requiring high-efficiency step-down voltage conversion with transient input voltage conditions
• Systems needing compact power solutions where board space is limited compared to TO-220 or TO-263 form factors
• Circuits demanding integrated thermal and short-circuit protection without external heat sinks beyond the PCB ground plane

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer designation as Micrel or Microchip Technology, noting the corporate acquisition history. Confirm the specific suffix indicates reel packaging. Ensure the component meets RoHS compliance requirements if specified for the project. Cross-reference the part number against official Microchip documentation to confirm pinout and electrical specifications match the design intent.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a 3A buck regulator is required in a surface-mount package smaller than standard TO-263. It is suitable for designs operating within a 4V to 30V input range. Consider the 200kHz switching frequency for passive component sizing. Evaluate the thermal requirements based on the SPAK package's ability to utilize the PCB ground plane for heat dissipation.

Voltage Regulators - DC DC Switching Regulators Part Context

The MIC4685 belongs to the SuperSwitcher family of high-efficiency switching regulators. Originally developed by Micrel, the product line was integrated into Microchip Technology's portfolio following their acquisition. The MIC4685WR-TR specifically denotes the version packaged in reels for automated surface-mount assembly processes.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Verify compatibility with existing footprints and thermal management strategies before considering alternative components from other manufacturers.