MIC2549A-2BTS-TR

Overview

The MIC2549A-2BTS-TR is a dual-channel, high-side power switch IC from Microchip Technology, housed in a 14-TSSOP package. It operates within a supply voltage range of 2.7V to 5.5V and supports load currents up to 3A per channel. The device features an adjustable current limit set by an external resistor, a soft-start circuit to minimize inrush current, and a maximum on-resistance of 50mΩ. Key protection mechanisms include thermal shutdown with an internal latch for the MIC2549A variant and an open-drain fault flag output. Typical supply currents are 90µA in the on-state and 1µA in the off-state.

Feature Summary

• Dual-channel high-side switching with programmable current limit up to 3A
• Internal latch mechanism for robust thermal shutdown control
• Open-drain fault flag output indicating current-limiting or thermal events
• Soft-start circuitry to manage inrush current during enable

Applications

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

Procurement Notes

Verify the specific suffix 'BTS' against the manufacturer's official datasheet to confirm pinout compatibility and enable logic polarity. Ensure the order quantity matches the standard reel packaging specifications provided by Microchip Technology. Cross-reference the component marking code with the latest revision history to avoid obsolete variants.

Selection Notes

Select this component when dual-channel high-side switching with independent current limiting is required. The MIC2549A variant is preferred over the MIC2545A if automatic latching upon thermal shutdown is necessary for system safety. Verify that the external programming resistor values align with the desired current limit thresholds within the 2.7V to 5.5V operating range.

Part Context

This part belongs to the MIC2545A/MIC2549A family of integrated high-side power switches. These devices are optimized for cost-effective power distribution solutions requiring minimal external components. The family includes variations with different enable polarities and package options, such as SOIC and DIP, catering to diverse PCB layout requirements.

Replacement Considerations

The MIC2549A-2YM-TR is a documented alternative within the same family, offering similar functionality in an 8-pin SOIC package. Verify pin-to-pin compatibility and ensure the reduced pin count does not impact the specific application's thermal or signal routing needs.