Monolithic battery charging device
First Claim
1. A monolithic battery charger comprising:
- a step-down converter having a duty ratio in the range of approximately 10 to approximately 95 and comprising at least one monolithically formed buck-type regulator coupled to a capacitor and an inductor, wherein at least one monolithically formed buck-type regulator comprises a switching controller, a switch, and a rectifier in a standard buck configuration, and wherein the controller operates at a switching frequency of at least 1 megahertz; and
a battery-terminal interface connected to the step-down converter for providing an output current and an output voltage to a rechargeable battery.
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Accused Products
Abstract
A monolithically formed battery charger may be fabricated as an integral part of a multifunctional integrated circuit or as independent monolithically formed integrated circuit. The monolithically formed battery charger includes at least one step-down converter having a given duty ratio coupled to a battery-terminal interface that provides a stepped-down output voltage and current that may be used to charge a rechargeable battery
The step-down converter includes one or more cascaded monolithically-formed synchronous-buck regulators operating at a frequency of at least one megahertz. Each regulator may include a capacitor, inductor, controller, switch, and rectifier. When cascaded, the high-side output node of a preceding synchronous-buck regulator is connected to the switch in a successive synchronous-buck regulator.
131 Citations
29 Claims
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1. A monolithic battery charger comprising:
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a step-down converter having a duty ratio in the range of approximately 10 to approximately 95 and comprising at least one monolithically formed buck-type regulator coupled to a capacitor and an inductor, wherein at least one monolithically formed buck-type regulator comprises a switching controller, a switch, and a rectifier in a standard buck configuration, and wherein the controller operates at a switching frequency of at least 1 megahertz; and
a battery-terminal interface connected to the step-down converter for providing an output current and an output voltage to a rechargeable battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A monolithic battery charger comprising, in combination:
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a first monolithically formed buck type regulator comprising;
a first P-type Metal Oxide Semiconductor switch having a first terminal for coupling to a high-side terminal of an external power supply, a first synchronous N-type Metal Oxide Semiconductor rectifier having a first terminal coupled in series with a second terminal of the first P-type Metal Oxide Semiconductor switch at a first node, a first inductor having a first terminal coupled in series with the second terminal of the first P-type Metal Oxide Semiconductor switch at the first node, a first capacitor having a first terminal coupled to the second terminal of the first monolithically-formed inductor at a first-output node and having a second terminal for coupling to a low-side terminal of the external power supply at a ground node; and
a first control circuit having (i) at least one input for receiving at least one feedback signal that is based on output signals detected at the first-output node, (ii) logic for generating switching signals to control the P-type Metal Oxide Semiconductor switch in response to the at least one feedback signal, and (iii) an output for triggering the first P-type Metal Oxide Semiconductor switch in response to the switching signals; and
a second monolithically formed buck type regulator coupled in series with the first monolithically formed buck type regulator, the second monolithically formed buck type regulator comprising;
a second P-type Metal Oxide Semiconductor switch having a first terminal coupled to the first-output node of the first monolithically formed buck type regulator, a second synchronous N-type Metal Oxide Semiconductor rectifier having a first terminal coupled in series with a second terminal of the second P-type Metal Oxide Semiconductor switch at a second node, a second inductor having a first terminal coupled in series with the second terminal of the second P-type Metal Oxide Semiconductor switch at the second node, a second capacitor having a first terminal coupled to the second terminal of the second monolithically-formed inductor at a second-output node and having a second terminal coupled to the ground node; and
a second control circuit having (i) at least one input for receiving at least one feedback signal that is based on output signals detected at the second-output node, (ii) logic for generating switching signals to control the P-type Metal Oxide Semiconductor switch in response to the at least one feedback signal, and (iii) an output for triggering the second P-type Metal Oxide Semiconductor switch in response to the switching signals; and
a battery-terminal interface coupled to the second-output node and the ground node, wherein the battery-terminal interface provides an output current and an output voltage to a rechargeable battery, wherein first control circuit and the second control circuit a control circuit r operate at a switching frequency of at least 150 megahertz. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification