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SC5826-1CS Datasheet(PDF) 7 Page - Semtech Corporation |
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SC5826-1CS Datasheet(HTML) 7 Page - Semtech Corporation |
7 / 8 page SC5826 © 2000 SEMTECH CORP. HotSwitch™ USB Power Distribution Switch PRELIMINARY - February 18, 2000 652 MITCHELL ROAD NEWBURY PARK CA 91320 7 TYPICAL APPLICATIONS Figure 2 - Bus-powered hub with ganged port power management Bus-powered hub, ganged port power management: A bus-powered hub distributes power and data from an input port to downstream ports. It must supply a con- tinuous 100mA of current to each downstream port. A bus-powered hub must be able to switch power to downstream ports to prevent illegal device hook-up. Inrush current limiting is also required to prevent power supply drooping. The circuit below utilizes the SC5826 to provide ganged port power switching, inrush current limiting and overcurrent protection for maximum port protection. In a ganged switch configuration, all ports are switched simultaneously. Under fault conditions, the USB controller will remove power to all of the ganged ports. For individual port management, an ad- ditional SC5826 may be used. Since USB is a hot insertion and removal system, USB ports are subject to electrostatic discharge (ESD). The SRDA05-4 provides ESD protection on the down- stream data and power lines. Each device will protect two USB ports. With proper layout the port is hard- ened to greater than 15kV, meeting the requirements of IEC 1000-4-2. On the upstream port, the LCDA05 provides ESD protection to the above levels for one line pair. The SC5203 (or SC5205) LDO regulator is used to power the hub controller from the upstream bus. |
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