Power supply charge pump and protection circuit
AssigneeMaxim Integrated Products, Inc.
InventorsMarco Farina, Mauro Ranzato, Gianluca Mariano
Life of this patent
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Abstract
In an embodiment, set forth by way of example and not limitation, an integrated circuit includes charge pump circuitry formed on an integrated circuit (IC) chip, a first protective circuit formed on the integrated circuit chip and coupling the first output node to a first IC port, a second protective circuit formed on the integrated circuit chip and coupling the second output node to a second IC port, and a third protective circuit formed on the integrated circuit chip and coupling the power input node to a power input IC port.
Claims8
An integrated circuit comprising:
- charge pump circuitry formed on an integrated circuit (IC) chip and having a first output node, a second output node, a power input node, and a control input node, wherein the charge pump circuitry includes a multiplexer (MUX) having a first input coupled to a doubler stage and a second input coupled to a level shifter;
- control logic formed on the integrated circuit chip and coupled to the control input node of the charge pump circuitry;
- a first protective circuit formed on the integrated circuit chip and coupling the first output node to a first IC port;
- a second protective circuit formed on the integrated circuit chip and coupling the second output node to a second IC port;
- a resistor coupled across the first IC port and the second IC port;
- and
- a third protective circuit formed on the integrated circuit chip and coupling the power input node to a power input IC port;
- wherein the first protective circuit, the second protective circuit and the third protective circuit each include a power field effect transistor (PFET) and a resistor coupled between a gate and a source of the PFET, wherein the sources of the PFETs are coupled to the charge pump circuitry.
A power supply charge pump and protection circuit comprising:
- charge pump circuitry having a first output node, a second output node, a power input node, and a control input node, wherein the charge pump circuitry includes a multiplexer (MUX) having a first input coupled to a doubler stage and a second input coupled to a level shifter;
- a first protective circuit coupling the first output node to a first port;
- a second protective circuit coupling the second output node to a second port;
- a resistor coupled across the first port and the second port;
- a third protective circuit coupling the power input node to a power input port;
- and
- control logic coupled to the control input node of the charge pump circuitry;
- wherein the first protective circuit, the second protective circuit and the third protective circuit each include a power field effect transistor (PFET) and a resistor coupled between a gate and a source of the PFET;
- and
- wherein the sources of the PFETs are coupled to the charge pump circuitry.
Dependencies are inferred from the claim text.