General Description

The MIC2010 is a dual channel USB power switch designed to support the power distribution requirements for USB Wakeup from the ACPI S3 state. The MIC2010 will directly switch its two outputs between a 5V main supply and a 5V auxiliary supply normally provided in ATX style power supplies.

The MIC2010 will adjust its current-limit threshold according to the ACPI state it is in. In the normal active ACPI S0 state the current-limit is set at 500mA minimum per channel satisfying the USB continuous output current specification. In the S3 state the current-limit can be reduced to a value determined by an external resistor to minimize the current that is supplied by the auxiliary supply, thereby ensuring that voltage regulation is maintained even during fault conditions.

Features

• Compliant to USB power distribution specifications

• Two completely independent switches

• Integrated switching matrix supports ACPI S0/S3 state

transitions without external FET circuits

• Make-before-break switching ensures glitch-free

transitions

• No back-feed of auxiliary supply onto main supply

during standby mode

• Bi-level current-limit preserves auxiliary supply voltage

regulation in standby mode

• Thermally isolated channels

• Thermal shutdown protection

• Fault status outputs with filter prevents false assertions

during hot-plug events

• Circuit breaker options with auto-reset (MIC2070)

• Undervoltage lockout

Applications

• Desktop PCs

• Notebook PCs

• Notebook docking stations

• LAN Servers

• PC motherboard