EUP3546

EUP3546 Dual Power-Distribution Switch with Fault-Blanking DESCRIPTION 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 into 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. FEATURES 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 Package RoHS Compliant and 100% Lead(Pb)-Free Halogen-Free APPLICATIONS 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 Typical Application Circuit Figure 1. DS3546 Ver1.0 Oct. 2009 1