Current-limited DC/DC converter simplifies USB power supplies
Bryan Legates
Abstract
The LT1618 DC/DC converter, which provides an accurate input current control ideal for USB applications, is described.
Keywords
DC/DC converter
LT1618
Many portable universal serial bus (USB) devices power themselves from the USB host or hub power supply when plugged into the USB port. Several requirements must be met to ensure the integrity of the bus: the USB specification dictates that the input capacitance of a device must be less than 10μF to minimize inrush currents when the device is plugged into the USB port; when first plugged in, the device must draw less than 100mA from the port; and for high power devices, the current drawn from ...
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