12V Switching Regulator Boosts Input Voltage

In conventional applications, switching-regulator ICs regulate VOUT by controlling the current through an external inductor. The IC in Figure 1, however, driving a diode-capacitor network in place of the inductor, offers comparable performance for small loads. Made of readily available components, the network can double, tripple or quadruple the input voltage. Though somewhat less efficient than inductor-type regulators, the Figure 1 circuit offers equivalent line and load regulation.

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http://www.maxim-ic.com/appnotes.cfm/appnote_number/5/ln/en
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12V Switching Regulator Boosts Input Voltage