EUP3545/a ds3545/a ver1.4 sep. 2011 1 usb power-distribution switch with fault blanking description the EUP3545/a is an incorporated 100m p-channel mosfet power-distribution switch for self-powered and bus-powered universal serial bus (usb) applications. when the output load exceeds the current-limit threshold or a short is present, the device limits the output current to safe level by switching into a constant-current limit mode with fold back, pulling the over-current ( oc ) logic output low. when continuous heavy overloads or short-circuits increase the powe r dissipation in the switch, causing the junction temperature to rise, a thermal protection circuit shutdown the switch to prevent damage. internal und er voltage lock-out (uvlo) circuitry ensures that the switch remains off until valid input voltage is pre sent. oc is open-drain output which is asserted when over-current or over-temperature event occurs. a 8m s fault-blanking feature enables the circuit to ignor e momentary faults, such as those caused when hot-swapping a capacitive load, preventing false al arms to the host system. the EUP3545/a eliminates any reversed current flow across the switch when it is powered off. the EUP3545/a are available in sot23-5, 8-pin msop and 8-pin msop(ep) packages, operates over the extended (-40c to +85c) temperature range. typical application circuit features 100m power mosfet operating range : 2.7v to 5.5v under voltage lockout 11a quiescent current 1a shutdown current logic level enable pin, available with active-low or active-high version no reverse current when power off fault blanking open-drain over-current flag output ( oc ) output shutdown pull-low resist o r available in sot23-5,msop-8 and msop-8 (ep) packages rohs compliant and 100% lead(pb)-free halogen-free ul listed-file no. e334299 applications usb ports and self-powered hubs usb bus-powered hubs hot plug-in power supplies general purpose high side switch applications figure 1.
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