DC-DC Converter Using Negative-Output Feedback

Switched-capacitor (SC) DC-DC converters have several advantages over inductive DC-DC converters in that they are easily integrated on-chip and can scale to desired power levels, rendering themselves promising for integrated voltage regulators, especially for small, low-power systems. However, many SC DC-DC converters offer only a few conversion ratios, limiting their use for systems in which either the input or output voltages vary. This is particularly important in wireless systems where battery voltage degrades slowly. [1] proposed a technique to reconfigure cascaded SC converters to achieve arbitrary binary ratios: p/2, 090% efficiency when downconverting from 2V to a 1.1-to-1.86V output voltage range.