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USB Power-Distribution Switch with Fault Blanking


The EUP3545/A is an incorporated 100mΩ 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 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 power dissipation in the switch, causing the junction temperature to rise, a thermal protection circuit shutdown the switch to prevent damage. Internal Under Voltage Lock-Out (UVLO) circuitry ensures that the switch remains off until valid input voltage is present.

OC is open-drain output which is asserted when over-current or over-temperature event occurs. A 8ms fault-blanking feature enables the circuit to ignore momentary faults, such as those caused when hot-swapping a capacitive load, preventing false alarms 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 (-40°C to +85°C) temperature range.


  • •Operating Range : 2.7V to 5.5V
  • •Under Voltage Lockout
  • •11µA Quiescent Current
  • •1µA 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 ( )
  • •Output Shutdown Pull-low Resistor
  • •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


  • •USB Ports and Self-Powered Hubs
  • •USB Bus-Powered Hubs
  • •Hot Plug-In Power Supplies
  • •General Purpose High Side Switch Applications
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