Back to results
US 2010/0141331 A1Published application
Method of forming a charge pump controller and structure therefor
AssigneeSemiconductor Components Industries, LLC
InventorHassan Chaoui
Life of this patent
Estimating the term…
Abstract
In one embodiment, a charge pump controller is configured with transistors having at least two different selectable on-resistance values may be used to charge a pump capacitor.
Claims20
A switched capacitor controller comprising:
- a first MOS transistor having a first portion that includes a first gate and having a second portion that includes a second gate, the first gate configured to form a first on-resistance of the first MOS transistor, the second gate configured to form a second on-resistance for the first MOS transistor that is less than the first on-resistance, the first MOS transistor configured to couple a pump capacitor to receive a first current to charge the pump capacitor;
- a second MOS transistor having a first portion that includes a first gate and a having a second portion that includes a second gate, the first gate configured to form a first on-resistance of the second MOS transistor, the second gate configured to form a second on-resistance for the second MOS transistor that is less than the first on-resistance, the second MOS transistor configured to couple the pump capacitor to provide a second current to a load;
- a first circuit configured to enable the first portion of the first MOS transistor but not the second portion of the first MOS transistor to charge the pump capacitor responsively to a first voltage on one of the pump capacitor or a load capacitor being no greater than a first value;
- the first circuit configured to enable the first portion of the second MOS transistor but not the second portion of the second MOS transistor to provide the second current to the load responsively to the first voltage being no greater than the first value;
- the first circuit configured to enable the first and second portions of the first MOS transistor responsively to the first voltage being no less than the first value;
- and
- the first circuit configured to enable the first and the second portions of the second MOS transistor responsively to the first voltage being no less than the first value.
4 more elements
A method of forming a switch for a switched capacitor controller comprising:
- forming a first MOS transistor with a first portion having a first gate that provides the first MOS transistor a first on-resistance responsively to enabling the first portion and with a second portion having a second gate that provides the first MOS transistor a second on-resistance responsively to enabling the second portion;
- and
- coupling the first MOS transistor to operably switch a pump capacitor to receive a first current to charge the pump capacitor.
A method of forming a switch for a switched capacitor controller comprising:
- coupling a first MOS transistor to operably switch a pump capacitor to receive a first current to charge the pump capacitor;
- coupling a second MOS transistor to operably switch the pump capacitor to supply a second current to a load capacitor;
- and
- configuring a first circuit to vary an on-resistance of the first MOS transistor and the second MOS transistor responsively to a voltage stored on one of the pump capacitor or the load capacitor.
1 more element
Dependencies are inferred from the claim text.