Patent ID: 8089787

Claim:
A dc-dc voltage conversion device comprising: an input node to receive a dc input voltage at an input level; an output node to output a dc output voltage at an output level different from the input level; a first pump capacitor and a second pump capacitor; switches configured to selectively arrange only the first and second pump capacitors in at least three different subcircuits relative to the input node and the output node, wherein at least one of the subcircuits comprising a subcircuit in which the first and second pump capacitors are not coupled to the input node; and a controller configured to control the switches to transition between at least three phases comprising the three different subcircuits to convert the dc input voltage at the input level at the input node to the dc output voltage at the output level at the output node, wherein the output level comprises at least one of 83%, 80%, 60%, 40%, 20%, or 17% of the input level.