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Tripler Converts 5V to 15V

2014-11-08 23:08  
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Tripler Converts 5V to 15V
This application note shows how to configure the MAX1683 to triple the input voltage for low-current applications while minimizing voltage drop. A similar version of this article appeared in the August 17, 2000 issue of ECN magazine. By configuring a charge-pump voltage doubler as a tripler, you can readily derive 15V from 5V. A 15V rail is useful for powering op amps, LCD-bias circuits, and other low-current applications. The connections in Figure 1 configure the MAX1683 voltage doubler as a tripler. The no-load output voltage of the circuit is approximately 3VIN - 2VD, where VD is the voltage drop across one diode. Use Schottky diodes as shown to minimize VD and its effect on output voltage.