供应 USB开关电源芯片 LM3526MX-L

LM3526MX-L General Description

The LM3526MX-L provides Universal Serial Bus standard power switch and over-current protection for all host port applications. The dual port device is ideal for Notebook and desktop PC’s that supply power to more than one port. A 1 ms delay on the fault flag output prevents erroneous overcurrent reporting caused by in-rush currents during hot-plug events. The dual stage thermal protection circuit in the LM3526MX-L provides individual protection to each switch and the entire device. In a short-circuit/over-current event, the switch dissipating excessive heat is turned off, allowing the second switch to continue to function uninterrupted. The LM3526MX-L accepts an input voltage between 2.7V and 5.5V allowing use as a device-based in-rush current limiter for 3.3V USB peripherals, as well as Root and Self-Powered Hubs at 5.5V. The Enable inputs accept both 3.3V and 5.0V logic thresholds. The small size, low R ON , and 1 ms fault flag delay make the LM3526MX-L a good choice for root hubs as well as per-port power control in embedded and stand-alone hubs.

LM3526MX-L Features

* 1 ms fault flag delay filters Hot-Plug events

* Smooth turn-on eliminates in-rush induced voltage drop

* UL recognized component: REF # 205202

* 1A nominal short circuit output current protects 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

* 140 mΩ Max. switch resistance

* 1 μA Max. standby current

* 200 μA Max. operating current

* Under-voltage lockout (UVLO)