Reconfigurable topology for switching and charge pump negative polarity regulators
First Claim
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1. An integrated circuit, comprising:
- a plurality of terminals including an output terminal and at least one input terminal; and
a configurable voltage regulator operable in a first mode or a second mode, comprising;
output driver circuitry, having an output coupled to the output terminal;
a first regulator mode control circuit, having at least one input coupled to an input terminal, having an output coupled to the output driver circuitry;
a second regulator mode control circuit, having at least one input coupled to an input terminal, and having an output coupled to the output driver circuitry; and
configuration circuitry, for selectably enabling the first and second regulator mode control circuits responsive to a configuration signal.
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Abstract
A configurable voltage regulator (128) operable in either of two selectable modes or topologies is disclosed. In one disclosed embodiment, the voltage regulator (128) can operate as a charge pump regulator or a switching regulator, to generate a negative polarity regulated voltage. The voltage regulator (128) includes an output driver (80), for example including first and second drive transistors (81A, 81B), that are used in both of the selectable modes.
21 Citations
20 Claims
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1. An integrated circuit, comprising:
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a plurality of terminals including an output terminal and at least one input terminal; and
a configurable voltage regulator operable in a first mode or a second mode, comprising;
output driver circuitry, having an output coupled to the output terminal;
a first regulator mode control circuit, having at least one input coupled to an input terminal, having an output coupled to the output driver circuitry;
a second regulator mode control circuit, having at least one input coupled to an input terminal, and having an output coupled to the output driver circuitry; and
configuration circuitry, for selectably enabling the first and second regulator mode control circuits responsive to a configuration signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of generating a regulated voltage, comprising the steps of:
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configuring a configurable voltage regulator in an integrated circuit into either a switching regulator mode or a charge pump regulator mode, the configurable voltage regulator comprising output drive circuitry having outputs at first and second drive terminals, the output drive circuitry including first and second transistors coupled to the first drive terminal;
in the switching regulator mode;
connecting a drive transistor to the first drive terminal;
connecting an external network including an inductor to the transistor, the external network producing the regulated voltage;
connecting an error amplifier of the voltage regulator to the external network, so that the error amplifier receives a voltage corresponding to the regulated voltage; and
disabling third and fourth transistors coupled to the second drive terminal;
in the charge pump regulator mode;
connecting a flyback capacitor to the first and second drive terminals;
enabling third and fourth transistors coupled to the second drive terminal, the fourth transistor coupled between the second drive terminal and a sense terminal;
connecting a load at the sense terminal;
coupling an error amplifier of the voltage regulator to the sense terminal, so that the error amplifier receives a voltage corresponding to the regulated voltage;
responsive to the configuring step configuring the configurable voltage regulator in the switching regulator mode;
coupling the output of the error amplifier to switching regulator control circuitry; and
coupling the output of the switching regulator control circuitry to the output drive circuitry so that the first and second transistors are driven by the switching regulator control circuitry responsive to the error amplifier; and
responsive to the configuring step configuring the configurable voltage regulator in the charge pump regulator mode;
coupling the output of the error amplifier to pulse width modulation circuitry; and
operating the pulse width modulation circuitry responsive to the error amplifier output to drive the first, second, third, and fourth transistors. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification