德信 EUTECH

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