EUP3545/A USB Power-Distribution Switch with Fault Blanking DESCRIPTION FEATURES 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 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 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. 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 APPLICATIONS Typical Application Circuit Figure 1. DS3545/A Ver1.4 Sep. 2011 100mΩ POWER MOSFET 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 ( OC ) 1 USB Ports and Self-Powered Hubs USB Bus-Powered Hubs Hot Plug-In Power Supplies General Purpose High Side Switch Applications