3.3V lithium-cell supply requires one inductor


Posted on Apr 16, 2012

This converter also requires either a transformer or two inductors in place of the single inductor that most dc/dc converters require. You might overlook an alternative approach because the converter uses a linear regulator and takes an efficiency hit when you fully charge the Li-ion battery to about 4.2V (Figure 1).



Nevertheless, this approach offers a longer battery life than the other two buck/boost circuits . For a large portion of the Li-ion battery`s discharge cycle, battery voltage is within a range that allows the converter to exhibit excellent efficiency




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