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Power USB VBUS in Autos with the LT8697

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Published on Jul 16, 2013

with Trevor Crane Design Engineer, Power Products

USB sockets appear in an increasing number of car models as portable devices become more ubiquitous. The USB interface delivers power to portable devices via the 5V VBUS and ground lines. Depending on the USB version and the portable device, the VBUS sources up to 2.1A. In a car, this high VBUS current presents a challenge. Often, car electronics including the VBUS regulator reside in a box in the dash while some of the USB sockets may be placed in the back seat. The cabling between the VBUS regulator and the socket can be several meters in length and twice that counting the return trip. Long cables mean high resistance, so the 5V VBUS supply drops out at high USB device current.

The LT®8697(http://www.linear.com/LT8697) fixes this problem. It is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator designed to power 5V USB applications.

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