MIC2549A-2BTS

Overview

The MIC2549A-2BTS is a programmable current-limit high-side 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 features an adjustable output current limit up to 3A. The device includes a soft-start circuit to minimize inrush current and provides thermal shutdown protection with an internal latch that turns the output off upon over-temperature events. An open-drain flag output indicates fault conditions such as current limiting or thermal shutdown.

Feature Summary

• Programmable current limit with precision resistor control
• Internal latch for robust thermal shutdown fault control
• Soft-start circuit minimizes inrush current during enable
• Open-drain fault flag output for status indication

Applications

• USB power distribution and switching
• Advanced Configuration and Power Interface (ACPI) applications
• Low-loss DC power switching systems
• Power management circuits requiring load current protection

Procurement Notes

Verify the specific suffix 'BTS' against the manufacturer's official datasheet to confirm pinout compatibility and enable logic polarity. Ensure the operating environment temperature range aligns with the TSSOP-14 package specifications. Confirm that the external programming resistor values match the required current limit settings defined in the electrical characteristics table.

Selection Notes

Select this component when a high-side switch with integrated thermal latching is required for fault isolation. The MIC2549A differs from the MIC2545A by including an internal latch for thermal shutdown, whereas the MIC2545A does not. Choose based on the need for active-high or active-low enable signals and verify that the 50mΩ maximum on-resistance meets the low-loss requirements of the application.

Part Context

This part belongs to the MIC2545A/2549A family of integrated high-side power switches designed for cost-effective power management solutions. These devices are optimized for USB and ACPI standards, requiring minimal external components. The family offers various package options including DIP, SOIC, and TSSOP, with variations in enable signal polarity and fault handling mechanisms.

Replacement Considerations

The MIC2545A-2BTS serves as a direct functional substitute if thermal latching is not required. Verify package compatibility and ensure the absence of the internal latch in the replacement does not impact system safety protocols. Cross-reference the enable logic polarity between active-high and active-low variants.