The design of battery-powered equipment can often be quite challenging. Since few ICs can operate directly from the end-of-life voltage from a 2-cell battery (about 1.8V), most systems require a DC/DC converter. The system designer often has a limited area in which to place the DC/ DC converter; associated inductors and capacitors must be small. [...]
The single-ended primary inductance converter (SEPIC)
shown in Figure 3 IC LT1618 is ideal for applications where the
output must reduce to zero during shutdown. The input
current limit not only helps soft-start the output but also
provides short-circuit protection, ensuring USB device
compliance even under output fault conditions.
Read More Source:
http://www.linear.com
If you want DC converter 5V to 15V Step-Up voltage.
I like IC LT1073,It is important part of this circuit.
15V OUTPUT
100mA AT 4.5VIN
Detail more, Please read in this image circuit.
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