USB Parasitic Power

TPS2550 and TPS2551 power distribution switches have integrated FETs that support a 100-mA to 1.1-A current limit range for a standard USB port or other applications requiring a current limited switch

.. TPS2149 USB power controller device.. TPS2114 TPS2015

TI presentation: http://www.ti.com/sc/docs/products/msp/intrface/usb/pwrmgt.pdf

Micrel MIC2505 etc http://www.micrel.com/_PDF/other/USBbroc.pdf


Arduino Duemilanove uses POLYFUSE..

Another: Raychem MINISMD050-2 in MINISMD pkg

http://nz.mouser.com/Search/Refine.aspx?N=254138+4294399709&Keyword=poly+fuse&FS=True