Product Description
California Micro Devices’ CM3501 is a dual port USB overcurrent power switch that selects between two independent 5V inputs available on a PC, depending on the state of a logic input (SEL). The device has two pairs of power switches, and each pair is an analog “OR” function, providing a continuous voltage at both outputs during power transfer beween inputs.

Features
• Dual outputs, each with independent over-current protection circuitry and indicator
• Supports standby mode in PCs so that a peripheral can ramp down safely to a current <100mA
• Low ON-resistance switches
• Up to 750mA (VCC) / 100mA (VSBY) continuous current on each output
• Over-current limits at 750mA / 100mA respectively
• 10msec min fault blanking delay on OC# outputs 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
• PC motherboards with USB ports (i.e., can use a CM3501 for 2 ports or 2 CM3501s for 4 ports, etc)