December 20th, 2007 Dual Current-Limiting Switch for USB
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.
Read Source:http://www.micrel.com/_PDF/App-Notes/an-32.pdf