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Abstract： Adding a dual USB switch （MAX1558） to a switching regulator （MAX5035B） yields a small circuit that can be built into the plug of an automotive cigarette lighter. It enables the single lighter socket to power or charge two automotive accessories such as portable navigation devices， while providing fault indicators and overload protection.
A similar version of this article appeared in the November 18， 2010 issue of EDN magazine.
Automotive accessories such as portable navigation devices （PNDs） are usually powered or charged using a simple adaptor plugged into the cigarette lighter. But， what if you want to power or charge two devices at once？ The circuit in Figure 1 is just what you need.
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