Power supply protection system
AssigneeMaxim Integrated Products, Inc.
InventorsMarco Farina, Mauro Ranzato, Gianluca Mariano
Life of this patent
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Abstract
A power supply protection system including a first metal oxide field effect transistor (MOSFET) having a first source, a first drain coupled to an input node, and a first gate; a second MOSFET having a second source coupled to the first source, a second drain coupled to an output node and a second gate coupled to the first gate, whereby the first MOSFET and the second MOSFET are coupled back-to-back; a zener diode coupled between the first and second sources and the first and second gates; and charge pump circuitry coupled across the zener diode, whereby a voltage on the first and second gates is boosted with respect to the voltage on the first and second sources.
Claims10
A power supply protection system comprising:
- a first metal oxide field effect transistor (MOSFET) having a first source, a first drain coupled to an input node, and a first gate;
- a second MOSFET having a second source coupled to the first source, a second drain coupled to an output node and a second gate coupled to the first gate, whereby the first MOSFET and the second MOSFET are coupled back-to-back;
- a zener diode coupled between the first and second sources and the first and second gates;
- charge pump circuitry coupled across the zener diode, whereby a voltage on the first and second gates is boosted with respect to the voltage on the first and second sources;
- and
- a first protection circuit coupled between the charge pump circuitry and the first and second gates and a second protection circuit coupled between the charge pump circuitry and the first and second sources.
A power supply protection system comprising:
- a first n-channel metal oxide field effect transistor (MOSFET) having a first source, a first drain coupled to an input node, and a first gate;
- a second n-channel MOSFET having a second source coupled to the first source, a second drain coupled to an output node and a second gate coupled to the first gate, whereby the first MOSFET and the second MOSFET are coupled back-to-back;
- a zener diode coupled between the first and second sources and the first and second gates, wherein an anode of the zener diode is coupled to the first and second sources;
- charge pump circuitry coupled across the zener diode, whereby a voltage on the first and second gates is boosted with respect to the voltage on the first and second sources;
- a capacitor coupled across the zener diode;
- and
- a first protection circuit coupled between the charge pump circuitry and the first and second gates and a second protection circuit coupled between the charge pump circuitry and the first and second sources.
Dependencies are inferred from the claim text.