System and methods for two-stage buck boost converters with fast transient response

摘要

Various embodiments of the invention provide for single and dual phase charge pump, two stage DC/DC buck-boost converters having fast line and load transient control irrespective of load conditions. In certain embodiments of the invention, this is accomplished by controlling a desired output voltage with an error amplifier that controls a plurality of hysteresis comparators. A dual phase charge pump architecture eliminates ripple currents and mode transitions and increases efficiency by splitting the total current between two paths. Certain embodiments allow to use low voltage semiconductor devices, which significantly reduces switching losses and further increases efficiency.

主权项

1. A switching regulator to convert an input voltage into an output voltage, the switching regulator comprising:
a first switching stage coupled to a first output voltage node, the first switching stage receives a first input voltage to convert it into a first output voltage that is relatively lower than the first input voltage; a second switching stage coupled to the first output voltage node, the second switching stage receives the first output voltage and converts the first output voltage to a second output voltage at a second output voltage node, the second output voltage is relatively higher than the first output voltage; first and second charge storage devices coupled to the first output voltage node; and a first flying capacitor that is coupled in parallel with the first charge storage device during a charging phase and in parallel with the second charge storage device during a charge transfer phase.