Power stage overdrive extender for area optimization and operation at low supply voltage
First Claim
1. A power stage overdrive circuit, comprising:
- a gate driver output stage, configured to drive a power switch at a control terminal;
a boost circuit,comprising a boost capacitor having a first terminal coupled to a power supply, and a second terminal coupled to the control terminal,configured to provide an overdrive voltage to the control terminal to turn the power switch on; and
a charge pump coupled to the control terminal, the charge pump configured to operate to maintain the power switch below saturation level.
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Abstract
It is an object of one or more embodiments of the present disclosure to provide a power stage overdrive circuit, at low supply voltages, that can be enabled/disabled on the fly. The power stage overdrive circuit increases the overdrive of a power switch to allow for simple power stage architecture with high voltage PMOS and NMOS devices. The power stage overdrive circuit comprises a driver, configured to drive the power switch having a control terminal, for example a gate terminal, and a boost circuit, further comprising a boost capacitor having a first terminal coupled to a power supply, for example a battery, and a second terminal coupled to the control terminal, configured to provide an overdrive voltage to the control terminal to turn the power switch on.
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Citations
15 Claims
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1. A power stage overdrive circuit, comprising:
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a gate driver output stage, configured to drive a power switch at a control terminal; a boost circuit, comprising a boost capacitor having a first terminal coupled to a power supply, and a second terminal coupled to the control terminal, configured to provide an overdrive voltage to the control terminal to turn the power switch on; and a charge pump coupled to the control terminal, the charge pump configured to operate to maintain the power switch below saturation level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for overdriving a circuit element, comprising the steps of:
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providing a gate driver output stage; driving a power switch at a control terminal; providing a boost capacitor coupled to a power supply and said control terminal; overdriving the control terminal, using said boost capacitor, to turn the power switch on; and operating a charge pump to maintain the power switch below saturation level. - View Dependent Claims (13, 14, 15)
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Specification