MIC2545A-1BM

Overview

The MIC2545A-1BM is a programmable high-side power switch from Microchip Technology, designed for low-loss DC power switching and power management applications. It features an N-channel output with a maximum on-resistance of 50 mΩ and supports input voltages from 2.7 V to 5.5 V. The device provides adjustable current limiting up to 3 A and includes thermal shutdown protection. It operates within a temperature range of -40°C to +85°C and utilizes an 8-pin SOIC package.

Feature Summary

• Adjustable current-limit capability protects attached devices from over-current conditions
• Integrated soft-start circuit minimizes inrush current during enable transitions
• Open-drain flag output indicates fault states such as current-limiting or thermal shutdown
• Compatible with both 3V and 5V logic enable signals

Applications

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

Procurement Notes

Verify the specific suffix '1BM' corresponds to the active-high enable configuration and 8-pin SOIC package when sourcing. Confirm that the component is sourced from authorized Microchip distributors to ensure authenticity. Check for RoHS compliance status if required by your manufacturing standards. Ensure the supply chain documentation matches the Micrel/Microchip part numbering scheme exactly.

Selection Notes

Select this component when a high-side switch with precise, resistor-programmable current limiting is required. It is suitable for applications needing robust thermal protection and fault indication via an open-drain flag. Consider the 50 mΩ maximum on-resistance for efficiency calculations. Ensure the enable signal voltage levels align with the 3V or 5V logic compatibility specified in the datasheet.

Part Context

The MIC2545A series is part of Microchip's integrated power switch family, optimized for cost-effective solutions with minimal external components. The MIC2545A-1BM specifically denotes the version with active-high enable functionality. It complements the MIC2549A, which adds internal latching upon thermal shutdown. Both are designed to meet stringent USB and ACPI requirements efficiently.

Replacement Considerations

The MIC2545A-2BM serves as a direct functional substitute with active-low enable polarity. Verify that the system design accommodates the inverted enable signal logic. Other series members like the MIC2549A offer additional latch features but may require different control strategies. Ensure pinout compatibility remains consistent across replacements.