L054BT26
APPLICATION INFORMATION (continued)
2.0 Universal Serial Bus (USB) ESD Protection
The L054BT26 can be used to protect the USB ports on mobile phones, monitors, PCs, peripherals
and other portable systems (please refer to schematic diagram below). In typical applications, the
voltage bus (VBUS) of USB ports are connected to the power pin (pin 5) of the device. Each data line
(D+/D-) of the USB ports is connected to the ESD protection pin of the device.
When an electrostatic discharge (ESD) pulse appears on the data line, the ESD pulse current will be
conducted by the L054BT26 away from the USB controller chip. In addition, the ESD pulse current
can also be conducted by the device away from the USB controller chip when the ESD voltage pulse
appears on the voltage bus (VBUS) of any of the USB ports. Therefore, the data lines (D+/D-) and
voltage bus (VBUS) of the two USB ports are complementally protected with the L054BT26 device.
Typical Universal Serial Bus 2.0 Serial Application of the L054BT26
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