Single Port USB Power Switch and Over-Current Protection
●General Description
●The LM3525 provides Universal Serial Bus standard power switch and over-current protection for all host port applications. The single port device is ideal for Notebook PC and Handheld PC applications that supply power to one port.
●A 1 ms delay on fault flag output prevents erroneous over current reporting caused by inrush currents during the hot-plug events.
●The LM3525 accepts an input voltage between 2.7V and 5.5V allowing use as a device-based inrush current limiter for 3.3V USB peripherals, as well as Root and Self-Powered Hubs at 5.5V. The Enable input accepts both 3.3V and 5.0V logic thresholds.
●The small size, low RON, and 1 ms fault flag delay make the LM3525 a good choice for root hubs as well as ganged power control in space-critical self-powered hubs.
●Features
●1 ms Fault Flag Delay During Hot-Plug Events
●Smooth Turn-On Eliminates Inrush Induced Voltage Drop
●UL Recognized Component: REF#205202
●1A Nominal Short Circuit Output Current Protects Notebook PC Power Supplies
●Thermal Shutdown Protects Device in Direct Short Condition
●500mA Minimum Continuous Load Current
●Small SO-8 Package Minimizes Board Space
●2.7V to 5.5V Input Voltage Range
●Switch Resistance≤120 mΩMax. at VIN=5V
●1µA Max Standby Current
●100 µA Max Operating Current
●Undervoltage Lockout (UVLO)
●Applications
●Universal Serial Bus (USB) Root Hubs including Desktop and Notebook PC
●USB Monitor Hubs
●Other Self-Powered USB Hub Devices
●High Power USB Devices Requiring Inrush Limiting
●General Purpose High Side Switch Applications
