Voltage converter with combined buck converter and capacitive voltage divider
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United States of America Patent
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Apr 23, 2013
Grant Date -
Feb 5, 2009
app pub date -
Jul 23, 2008
filing date -
Aug 1, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A voltage converter including a buck converter and a capacitive voltage divider. The converter includes four capacitors, a switch circuit, an inductor and a controller. A first capacitor is coupled between a reference node and a first output node which develops a first output voltage. A second capacitor is coupled between an input node and either the reference node or the first output node. The switch circuit couples a third capacitor between the reference and first output nodes in a first state of a PWM signal, and couples the third capacitor between the first output and input nodes in a second PWM signal state. The inductor is coupled to the third capacitor and provides a second output node coupled to the fourth capacitor providing a second output voltage. The controller controls the duty cycle of the PWM signal to regulate the second output voltage to a predetermined level.
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