Product Description

California Micro Devices’ CM3503 is a USB overcurrent power switch that provides power to two USB ports. The device has a very low on-resistance power switch that provides the VBUS voltage at the USB output ports with minimal voltage drop. When the EN# pin is logic low, the power switch is ON, and VCC is connected to the output VOUT. When the EN# pin is logic high, the power switch is OFF, and no power is available at the output.

Features

• High-side high current switch with active low Enable

• Very low on-resistance switch (0.07? typ.)

• Up to 1.4A continuous current on the output

• Over-current limits at 1.4A min

• 10msec min fault blanking delay on OC# output prevents false overcurrent alarms

• Prevents backdrive current when host powered off

• Low operating current (95µA typ.)

• Low quiescent current when disabled (<1µA max)

• Small 8-Lead SOIC package

Applications

• 2 USB ports 5V supply overcurrent protection