Single μC-buckboost converter with multiple regulated supply outputs
First Claim
1. An apparatus comprising:
- a first flying capacitor;
a second flying capacitor;
a switch matrix having an input, a first output, and a second output to which the first flying capacitor and the second flying capacitor are selectively coupled; and
a controller configured to, in response to a given value X of a ratio between a supply voltage VS at the input and a first desired output voltage at the first output, control the switch matrix to couple the first flying capacitor and the second flying capacitor to the input in a charging arrangement corresponding to the given value X during a charge phase, and during a first discharge phase couple the first flying capacitor and the second flying capacitor to the first output in a first discharging arrangement corresponding to the given value X to generate the first desired output voltage, and during a second discharge phase couple the first flying capacitor and the second flying capacitor to the second output in a second discharging arrangement corresponding to the given value X to generate a second desired output voltage, wherein the switch matrix and controller are configured to;
include a first boost/buck mode that generates a voltage equal to (7/4)·
VS for the first desired output voltage in which the second desired output voltage is less than VS; and
include a first buck/boost mode that at least generates a voltage that is equal to (7/4)·
VS for the second desired output voltage in which the first desired output voltage is less than VS.
2 Assignments
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Accused Products
Abstract
The detailed description described embodiments of highly efficient power management systems configurable to simultaneously generate various output voltage levels for different components, sub-assemblies, and devices of electronic devices, sub-systems, and systems. In particular, the described embodiments include power management systems that substantially reduce or eliminate the need for inductors, large numbers of capacitors, and complex switching techniques to transform an available voltage level from a system power source, such as a battery, to more desirable power supply voltages. Some described embodiments include a charge pump that uses only two flying capacitors to simultaneously generate multiple supply outputs, where each of the multiple supply outputs may provide either the same or a different output voltage level. The described embodiments also include efficient power management systems that flexibly provide highly accurate voltage levels that are substantially insensitive to the voltage level provided by a system power source, such as a battery.
473 Citations
34 Claims
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1. An apparatus comprising:
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a first flying capacitor; a second flying capacitor; a switch matrix having an input, a first output, and a second output to which the first flying capacitor and the second flying capacitor are selectively coupled; and a controller configured to, in response to a given value X of a ratio between a supply voltage VS at the input and a first desired output voltage at the first output, control the switch matrix to couple the first flying capacitor and the second flying capacitor to the input in a charging arrangement corresponding to the given value X during a charge phase, and during a first discharge phase couple the first flying capacitor and the second flying capacitor to the first output in a first discharging arrangement corresponding to the given value X to generate the first desired output voltage, and during a second discharge phase couple the first flying capacitor and the second flying capacitor to the second output in a second discharging arrangement corresponding to the given value X to generate a second desired output voltage, wherein the switch matrix and controller are configured to; include a first boost/buck mode that generates a voltage equal to (7/4)·
VS for the first desired output voltage in which the second desired output voltage is less than VS; andinclude a first buck/boost mode that at least generates a voltage that is equal to (7/4)·
VS for the second desired output voltage in which the first desired output voltage is less than VS. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification