Dual Current-Limiting Switch for USB

Posted on Feb 13, 2013

The circuit in Figure 1 uses the MIC2545A-2 and the MIC2778. The MIC2545A-2 is a programmable current limit high-side switch that is capable of having current-limit up to 2.5A.

The current-limit is set by the external resistor. In this circuit, there are two current-limits, 100mA and 500mA. USB specifications limit the device current to 100mA prior to enumeration. After enumeration, a high-powered device can request no more

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