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Dual Power-Distribution Switch with Fault-Blanking


The EUP3546 incorporates dual 95m_ P-channel MOSFET power switches for power-distribution systems that require multiple power switches in a single package. Each switch is controlled by a logic enable input.

When either output load exceeds the current-limit threshold or a short is present, the device limits the outputs current to a safe level by switching a constant-current limit mode with fold back, pulling the over-current (OCB(s)) logic output low. When

continuous heavy overloads or short-circuits increase the power dissipation in the switches, causing the junction temperature to raise, a thermal protection circuit shutdown the switches to prevent damage. Internal Under Voltage Lock-Out (UVLO) circuitry ensures that the switches remain off until valid input voltage is present. Each power switch is designed to set current limit at 1A typically.

OCB(s) are open-drain outputs which are asserted when over-current 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 EUP3546 eliminates any reversed current flow across each switch when it is powered off.

The EUP3546 is available in 8-pin SOP package, operates over the extended (-40 to ℃ +85 ) temperature ℃ range.


  • • Dual 95m_ High-Side MOSFET
  • • 1A Current Limits with Fold-back
  • • Operating Range:2.7V to 5.5V
  • • 300µS Typical Rise Time
  • • Under voltage Lockout
  • • 15µA Quiescent Supply Current
  • • 1µA Shutdown Supply Current
  • • Logic Level Enable Pin, Available with Active-Low Version
  • • No Reverse Current when Power Off
  • • Open-Drain Over-Current Flag Outputs with fault-blanking
  • • Available in SOP-8 and SOP-8(EP)Packages
  • • RoHS Compliant and 100% Lead(Pb)-Free Halogen-Free


  • • High-Side Power Protection Switch
  • • USB Power Management
  • • USB Host and Self-Powered Bubs
  • • USB Bus-Powered Hubs
  • • Hot Plug-In Power Supplies
  • • Battery-Charger Circuits
  • • Short-Circuit Protections
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