LM3525 Datasheet | National Semiconductor

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 overcurrent 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 n 1 ms Fault Flag Delay During Hot-Plug Events n Smooth Turn-On Eliminates Inrush Induced Voltage Drop n UL Recognized ponent: REF # 205202 n 1A Nominal Short Circuit Output Current Protects Notebook PC Power Supplies n Thermal Shutdown Protects Device in Direct Short Condition n 500m A Minimum Continuous Load Current n Small SO-8 Package Minimizes Board Space n 2.7V to 5.5V Input Voltage Range n Switch Resistance ≤ 120 mΩ Max. at VIN = 5V n 1µA Max Standby Current n 100 µA Max Operating Current n Undervoltage Lockout (UVLO) Applications n Universal Serial Bus (USB) Root Hubs including Desktop and Notebook PC n USB Monitor Hubs n Other Self-Powered USB Hub Devices n High Power USB Devices Requiring Inrush Limiting n General Purpose High Side Switch Applications Typical Operating Circuit and Connection Diagram DS101055-2 LM3525M-L DS101055-1 DS101055-31 DS101055-30 LM3525M-H © 2000 National Semiconductor Corporation DS101055 .national. Ordering Information Part Number LM3525M-H LM3525M-L LM3525MX-H LM3525MX-L Enable, Delivery Option Active High Enable, 95 units per rail Active Low Enable, 95 units per rail Active High Enable, 2500 units per reel Active Low Enable, 2500...