This is a USB to 12V Boost Converter circuit.It use the IC LT1618 from Linear technology. The converter has a selectable 100mA/500mA input current limit, allowing the device to be easily switched between the USB low and high power modes.The efficiency can exceed 85%. If the load demands more current than the converter can provide.with the input current limited to 100mA (or 500mA), the output voltage will simply decrease and the LT1618 will operate in constant-current mode.source
DC to DC converter
USB to 12V Boost Converter
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