MIC2549A-2BM-TR

Overview

The MIC2549A-2BM-TR is a dual-channel high-side power switch from Microchip Technology, housed in an 8-SOIC surface-mount package. It operates within a supply voltage range of 2.7V to 5.5V and supports a maximum output current of 3A per channel. The device features a typical on-resistance of 35mΩ and a maximum of 50mΩ. Key electrical parameters include a 2ms soft-start time and a 25µs turn-off time. It functions across an operating temperature range of -40°C to +85°C.

Feature Summary

• Dual-channel high-side switching capability for independent load control
• Resistor-programmable current limit up to 3A with integrated soft-start
• Internal latch mechanism that permanently disables the output upon thermal shutdown
• Open-drain fault flag output indicating current-limiting or thermal events

Applications

• USB power distribution systems
• PCI bus power switching applications
• Notebook PC power management circuits
• Advanced Configuration and Power Interface (ACPI) implementations

Procurement Notes

Verify the specific suffix '2BM' against the manufacturer's official datasheet to confirm the active-low enable configuration and SOIC package variant. Ensure the ordering part number matches the required pinout and logic levels. Cross-reference the revision history for any updates to electrical characteristics or package dimensions prior to final procurement approval.

Selection Notes

Select this component when dual-channel high-side switching with robust thermal protection is required. The internal latch feature distinguishes it from non-latching variants like the MIC2545A, providing superior fault isolation. Consider the 35mΩ typical on-resistance for efficiency calculations and ensure the external programming resistor aligns with the desired 3A current limit threshold.

Part Context

This part belongs to the MIC2545A/2549A family of programmable current-limit high-side switches. While sharing core functionality with the single-channel MIC2545A, the MIC2549A specifically offers dual outputs and a thermal shutdown latch. The '-2BM-TR' designation indicates the dual-channel variant in an 8-SOIC package supplied in tape and reel format.

Replacement Considerations

• MIC2549A-1YM-TR
• MIC2549A-2BTS TR

FAQ

How does the MIC2549A handle thermal shutdown compared to other variants?

The MIC2549A includes an internal latch that turns the output off upon thermal shutdown, requiring the enable signal to reset the latch, whereas non-latching variants may automatically recover.

What is the function of the open-drain flag output?

The open-drain flag output signals a local controller when the device enters current-limiting mode or experiences a thermal shutdown event.