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A simple model for DC/DC charge pumps

Posted: 26 Jun 2008 ?? ?Print Version ?Bookmark and Share

Keywords:application note? charge pump? DC/DC converter? portable application?

Charge pumps provide higher operating efficiency and increased input and output noise when compared to LDO regulators. They are a cost-effective solution and do not require a magnetic component, as required with inductive switching regulators.

Multi-mode step-down and step-up DC/DC charge pumps utilizing two flying capacitors were presented. An equivalent DC model was provided which predicts charge pump efficiency and maximum output current. The model includes a voltage-dependent voltage source, a series modulation resistance (RM) and output resistance (ROUT). The mode variable M is selected by the charge pump IC to maintain maximum efficiency, while output regulation is achieved by modulating the switching duty cycle and/or frequency. The operating mode determines the flying capacitor arrangement, sets charge pump fractional input-to-output gain, and impacts the input voltage headroom.

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