Expanded range DC-DC converter
First Claim
1. A DC-DC converter configured to provide a converter output voltage using a DC source voltage and comprising:
- converter control circuitry configured to select one of a first boost operating mode, a second boost operating mode, and a boost disabled mode based on the DC source voltage, and further configured to select the boost disabled mode when a setpoint of the converter output voltage is less than the DC source voltage minus an operating headroom; and
a boosting charge pump having a charge pump output and configured to;
during the boost disabled mode, present a high impedance at the charge pump output;
during the first boost operating mode, provide a charge pump output voltage via the charge pump output, such that a nominal value of the charge pump output voltage is equal to about one and one-half times the DC source voltage; and
during the second boost operating mode, provide the charge pump output voltage via the charge pump output, such that a nominal value of the charge pump output voltage is equal to about two times the DC source voltage.
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Accused Products
Abstract
A DC-DC converter, which provides a converter output voltage using a DC source voltage, is disclosed. The DC-DC converter includes converter control circuitry and a boosting charge pump. The converter control circuitry selects one of a first boost operating mode, a second boost operating mode, and a boost disabled mode based on the DC source voltage. During the boost disabled mode, the boosting charge pump presents a high impedance at a charge pump output of the boosting charge pump. Otherwise, the boosting charge pump provides a charge pump output voltage. During the first boost operating mode, a nominal value of the charge pump output voltage is equal to about one and one-half times the DC source voltage. During the second boost operating mode, a nominal value of the charge pump output voltage is equal to about two times the DC source voltage.
418 Citations
19 Claims
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1. A DC-DC converter configured to provide a converter output voltage using a DC source voltage and comprising:
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converter control circuitry configured to select one of a first boost operating mode, a second boost operating mode, and a boost disabled mode based on the DC source voltage, and further configured to select the boost disabled mode when a setpoint of the converter output voltage is less than the DC source voltage minus an operating headroom; and a boosting charge pump having a charge pump output and configured to; during the boost disabled mode, present a high impedance at the charge pump output; during the first boost operating mode, provide a charge pump output voltage via the charge pump output, such that a nominal value of the charge pump output voltage is equal to about one and one-half times the DC source voltage; and during the second boost operating mode, provide the charge pump output voltage via the charge pump output, such that a nominal value of the charge pump output voltage is equal to about two times the DC source voltage. - View Dependent Claims (2, 3, 4, 5, 6, 11, 12, 13, 14, 16, 17, 18, 19)
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7. A DC-DC converter configured to provide a converter output voltage using a DC source voltage and comprising:
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converter control circuitry configured to select one of a first boost operating mode, a second boost operating mode, and a boost disabled mode based on the DC source voltage, and further configured to select the boost disabled mode to at least partially charge a first flying capacitive element and at least partially charge a second flying capacitive element; and a boosting charge pump comprising the first flying capacitive element and the second flying capacitive element and having a charge pump output and configured to; during the boost disabled mode, present a high impedance at the charge pump output; during the first boost operating mode, provide a charge pump output voltage via the charge pump output, such that a nominal value of the charge pump output voltage is equal to about one and one-half times the DC source voltage; and during the second boost operating mode, provide the charge pump output voltage via the charge pump output, such that a nominal value of the charge pump output voltage is equal to about two times the DC source voltage. - View Dependent Claims (8, 9, 10)
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15. A DC-DC converter configured to provide a converter output voltage using a DC source voltage and comprising:
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converter control circuitry configured to select one of a first boost operating mode, a second boost operating mode, and a boost disabled mode based on the DC source voltage; a boosting charge pump having a charge pump output and configured to; during the boost disabled mode, present a high impedance at the charge pump output; during the first boost operating mode, provide a charge pump output voltage via the charge pump output, such that a nominal value of the charge pump output voltage is equal to about one and one-half times the DC source voltage; and during the second boost operating mode, provide the charge pump output voltage via the charge pump output, such that a nominal value of the charge pump output voltage is equal to about two times the DC source voltage; and a buck converter having a buck converter output and coupled to the boosting charge pump, such that during the first boost operating mode and the second boost operating mode, the buck converter is configured to provide the converter output voltage via the buck converter output using the charge pump output voltage.
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Specification