Linear charger circuit and method of operating linear charger circuit
First Claim
1. A linear charger circuit for providing an output current at an output node, the linear charger circuit comprising:
- a pass device connected between an input node and the output node;
first and second replica devices connected in parallel to the pass device, with their control terminals coupled to a control terminal of the pass device, wherein the first replica device is coupled to a first circuit path for determining whether current output by the linear charger circuit shall be terminated and the second replica device is coupled to a second circuit path for providing feedback for controlling the pass device;
a control circuit coupled to the second circuit path for controlling the pass device based on a quantity indicative of a current flowing through the second circuit path; and
a switching circuit coupled to the second circuit path,wherein the switching circuit is adapted to enable the first circuit path based on the quantity indicative of the current flowing through the second circuit path.
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Accused Products
Abstract
A linear charger circuit and method for providing an output current at an output node is presented. The circuit contains a pass device connected between an input node and the output node, first and second replica devices connected in parallel to the pass device, with their control terminals coupled to a control terminal of the pass device. The first replica device is coupled to a first circuit path for determining whether current output by the linear charger circuit shall be terminated. The second replica device is coupled to a second circuit path for providing feedback for controlling the pass device, a control circuit coupled to the second circuit path for controlling the pass device based on a quantity indicative of a current flowing through the second circuit path, and a switching circuit coupled to the second circuit path.
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Citations
32 Claims
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1. A linear charger circuit for providing an output current at an output node, the linear charger circuit comprising:
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a pass device connected between an input node and the output node; first and second replica devices connected in parallel to the pass device, with their control terminals coupled to a control terminal of the pass device, wherein the first replica device is coupled to a first circuit path for determining whether current output by the linear charger circuit shall be terminated and the second replica device is coupled to a second circuit path for providing feedback for controlling the pass device; a control circuit coupled to the second circuit path for controlling the pass device based on a quantity indicative of a current flowing through the second circuit path; and a switching circuit coupled to the second circuit path, wherein the switching circuit is adapted to enable the first circuit path based on the quantity indicative of the current flowing through the second circuit path. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of operating a linear charger circuit having a pass device connected between an input node and an output node of the linear charger circuit,
the method comprising: -
providing first and second replica devices in parallel to the pass device, with their control terminals coupled to a control terminal of the pass device; coupling the first replica device to a first circuit path for determining whether current output by the linear charger circuit shall be terminated and coupling the second replica device to a second circuit path for providing feedback for controlling the pass device; controlling the pass device based on a quantity indicative of a current flowing through the second circuit path; and enabling the first circuit path based on the quantity indicative of the current flowing through the second circuit path. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification