MIC2012BM

Controllers Overview

The MIC2012BM is a dual-channel USB power controller designed for ACPI S3 state wakeup support. It switches between a 5V MAIN supply and a 5V AUX supply based on the S3# input level. In the active S0 state (S3# HIGH), it provides up to 500mA per channel with a typical on-resistance of 140mΩ. In the standby S3 state (S3# LOW), it limits current to approximately 100mA with a typical on-resistance of 700mΩ to preserve auxiliary supply regulation. The device features make-before-break switching, thermal shutdown protection, and undervoltage lockout. It operates within an ambient temperature range of 0°C to +70°C and is housed in an 8-lead SOIC package.

Controllers Feature Summary

• Integrated switching matrix supports ACPI S0/S3 state transitions without external FET circuits
• Bi-level current-limit preserves auxiliary supply voltage regulation in standby mode
• Make-before-break switching ensures glitch-free transitions between states
• Thermally isolated channels prevent faults in one channel from affecting the other

Controllers Applications

• Desktop PCs
• Notebook PCs
• Notebook Docking stations
• LAN Servers
• PC Motherboards

Controllers Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm pin configuration and enable logic levels. The 'BM' designation indicates an 8-lead SOIC package with open-drain fault outputs and standard operating temperature range. Confirm availability status directly with authorized distributors as component lifecycle status may change.

Controllers Selection Notes

Select this component when designing systems requiring compliant USB power distribution with ACPI S3 wakeup capabilities. Ensure the application utilizes both a 5V MAIN and 5V AUX supply. Verify that the required current limits align with the fixed thresholds provided for S0 and S3 states. Consider the 8-lead SOIC package constraints for PCB layout and thermal management requirements.

Controllers Part Context

This part belongs to the MIC2012/MIC2072 family of USB power controllers manufactured by Micrel (now Microchip Technology). While the MIC2012 automatically resets upon thermal recovery, the MIC2072 variant offers latching circuit breaker functionality. Both share the same core switching matrix and dual-channel architecture optimized for PC motherboard power management applications.

Controllers Replacement Considerations

Direct replacements include the MIC2012YM or MIC2012CM variants which share the 8-lead SOIC package but differ in fault output configuration. For latching behavior, the MIC2072 series serves as a functional alternative. Verify pin compatibility and electrical characteristics before substitution.