MIC2549A-2YTS

Overview

The MIC2549A-2YTS is a single-channel high-side power switch from Microchip Technology, housed in a 14-pin TSSOP package. It operates within a supply voltage range of 2.7V to 5.5V and supports an adjustable current limit up to 3A. The device features a typical on-state resistance of 35mΩ and includes thermal shutdown with an output latch for robust fault protection. It incorporates a 2ms soft-start function and reverse current blocking capabilities.

Feature Summary

• Programmable current limit and soft-start functionality protect both the switch and attached devices
• Integrated thermal shutdown with output latch provides robust over-temperature fault control
• Open-drain flag output enables effective controller monitoring and system management

Applications

• USB power distribution systems
• PCI bus power switching applications
• Notebook PC power management circuits

Procurement Notes

Verify the specific suffix 'TR' indicates tape-and-reel packaging when ordering. Confirm the operating temperature range meets environmental requirements. Ensure the 14-TSSOP footprint matches the PCB layout. Validate that the 2.7V to 5.5V input range aligns with the system power rails. Check for RoHS compliance status if required by project specifications.

Selection Notes

Select this component for applications requiring precise current limiting and thermal protection. The adjustable current limit allows customization for various load profiles. The integrated latch feature simplifies recovery logic design compared to non-latching alternatives. Consider the 35mΩ on-resistance for efficiency calculations in low-voltage systems.

Part Context

This part belongs to the MIC2545A/2549A family of programmable current-limit high-side switches. While the MIC2545A lacks the thermal latch, the MIC2549A adds this feature for enhanced safety. Both share similar electrical characteristics but differ in fault handling mechanisms. This family targets ACPI and USB power management standards.

Replacement Considerations

The MIC2545A-2YTS is a related variant but lacks the internal thermal latch found in the MIC2549A. Substitution requires verifying if the latch feature is critical for the application. No other direct substitutes are confirmed in the provided documentation.