Abstract: A battery charging circuit comprises two or more charging circuits, each capable of charging a battery. The charging outputs of the charging circuits are connected together and can be connected to a battery to provide fast charging of the battery. The charging circuits can be configured so that they do not adversely interfere with each other during battery charging.

Abstract: In one embodiment, a fuel gauge system is described that comprises two or more battery chargers on different integrated circuits (ICs) coupled in parallel to a battery for charging the battery. Each battery charger IC generates a current signal indicative of current generated by said each battery charger IC into the same battery. A fuel gauge is responsible for accurately reporting the battery state of charge, based on a combination of voltage, current, and temperature information.

Abstract: A multi-phase charging circuit comprises a device that can be configured for master mode operation or slave mode operation. In master mode operation, the device generates a control signal and a clock signal to control operation of a switching circuit for generating charging current. In slave mode operation, the device receives externally generated control and clock signals to control operation of its switching circuit.

Abstract: Multiple power chargers for mobile terminals are disclosed. In particularly contemplated aspects, a mobile terminal may include two charging circuits arranged serially, such that only one charging circuit charges a battery of the mobile terminal at a time. The serial arrangement allows consolidation of fuel gauge circuitry within one of the charging circuits. In a particularly contemplated aspect, a second charger is tied to a first charger at a system power node. The system power node is further tied to a top port of the second charger. A bottom port of the second charger is tied to a top port of the first charger. A bottom port of the first charger is tied to the battery of the mobile terminal. The fuel gauge circuitry may sense battery current using a known ON resistance of a field effect transistor (FET) of the first charger.

Abstract: A multi-phase charging circuit comprises a device that can be configured for master mode operation or slave mode operation. In master mode operation, the device generates a control signal and a clock signal to control operation of a switching circuit for generating charging current. In slave mode operation, the device receives externally generated control and clock signals to control operation of its switching circuit.

Abstract: A circuit may include a switching signal generator to generate a high-side switching signal and a low-side switching signal. A low-side switch may be connected to the output of the circuit and to the switching signal generator to receive the low-side switching signal. A plurality of high-side switches may be connected to corresponding inputs of the circuit. A matrix may be configured to selectively connect the high-side switching signal to two or more of the high-side switches.

Abstract: Disclosed is a battery charging circuit having several operating modes include boost and buck mode, and forward and reverse mode. A power train and a current sensing block may share power transistors thus reducing the number of space-consuming power devices in the circuit. The current sensing block may indicate output current based only a sensed input current, and vice versa.

Abstract: The present disclosure includes circuits and methods for cable resistance compensation. In one embodiment, the present disclosure includes a circuit comprising a regulator coupled to receive an input voltage and an input current from an external power source across a cable, a voltage sensor coupled to sense the input voltage, a collapse detector coupled to detect whether or not the input voltage is below a first value, and a current limit circuit to control a maximum current in the regulator. The current limit circuit is reconfigured to a plurality of current limit values and the collapse detector detects if the input voltage from the external power source collapses below the first value at the plurality of current limit values. The voltage sensor measures different voltages at different input currents, and in accordance therewith, reduces collapse voltage value to compensate for a voltage drop caused by a resistance of the cable.

Abstract: A switching regulator circuit provides forward mode operation where a voltage provided at an input port can be boosted or bucked to produce a regulated voltage at an output port of the circuit. In accordance with the present disclosure, the switching regulator circuit includes two or more input ports. The switching regulator circuit provides a reverse boost operation in which a voltage provided at the output port of the circuit can be boosted to produce a regulated voltage at both of the input ports of the circuit.

Abstract: Embodiments of the present invention include circuits and methods for sensing resistance. In one embodiment the present invention includes a method comprising detecting a voltage at an input of a regulator received from a power adapter, determining a maximum current capability of the power adapter, and charging a battery coupled to an output of the regulator using said detected voltage and said maximum current as inputs to said regulator. In one embodiment, the detected voltage is used to configure a voltage used to determine if or when a voltage received from a power adapter drops below some threshold.

Abstract: The present disclosure includes circuits and methods for controlling skin temperature of an electronic device. In one embodiment, a thermal sensor is configured on a case of a handheld electronic device. The thermal sensor is coupled to a battery charger having a current limit circuit. If the sensed temperature of the case increases above a threshold, a current limit is reduced to reduce current in the battery charger.

Abstract: Circuitry in an adapter, such as a power supply, can provide power at a desired voltage level to a portable device. The circuitry may assert one of several electrical configurations on the cabling that electrically connects the portable device to the external device to indicate to the external device a desired voltage level.

Abstract: In one embodiment, an electronic system comprises one or more power circuits configured to receive a first voltage from an external power source and produce a second voltage to one or more electronic components of the electronic system, and a power management circuit configured to determine one or more output currents of the one or more power circuits, wherein the power management circuit causes the external power source to change the first voltage based on at least one output current of at least one power circuit to reduce power loss of the at least one power circuit.

Abstract: Aspects disclosed include systems and methods for context based battery charging. In one aspect, context information about usage patterns of an electronic device is used to customize charging a rechargeable battery. In one aspect, a predictive engine accesses context information and generates a predicted charge duration. A charging application customizes charging parameters in a battery charger based on the predicted charge duration. In some aspects, the charging application may generate suggestions to a user to improve battery charging.

Abstract: A switching regulator circuit provides forward mode operation where a voltage provided at an input port can be boosted or bucked to produce a regulated voltage at an output port of the circuit. In accordance with the present disclosure, the switching regulator circuit includes two or more input ports. The switching regulator circuit provides a reverse boost operation in which a voltage provided at the output port of the circuit can be boosted to produce a regulated voltage at both of the input ports of the circuit.

Abstract: A system and method providing for delayed initialization of a device in a wireless charging environment. In certain aspects, a device is configured to detect power wirelessly received from a power transmitter. The device may further wirelessly transmit a message to the power transmitter in response to the received power, further determining that a power level of the received power has been adjusted in response to the message. In response to the determining the power level has been adjusted, a controller that is powered by the adjusted power level may be initialized.

Abstract: A battery charging circuit comprises two or more charging circuits, each capable of charging a battery. The charging outputs of the charging circuits are connected together and can be connected to a battery to provide fast charging of the battery. The charging circuits can be configured so that they do not adversely interfere with each other during battery charging.

Abstract: A multi-phase charging circuit comprises a device that can be configured for master mode operation or slave mode operation. In master mode operation, the device generates a control signal and a clock signal to control operation of a switching circuit for generating charging current. In slave mode operation, the device receives externally generated control and clock signals to control operation of its switching circuit.

Abstract: Embodiments of the present invention include electronic circuits, systems, and methods for charging a battery. In one embodiment, the present invention includes a method, which may be implemented by an integrated circuit, comprising charging the battery using a constant current until the voltage on the battery increases to a first voltage level, and charging the battery using a constant voltage, wherein the constant voltage is set to a second voltage level. The constant current charging transitions to constant voltage charging when the voltage on the battery reaches the first voltage level, where the first voltage level is greater than the second voltage level.

Abstract: Circuitry in an adapter, such as a power supply, can provide power at a desired voltage level to a portable device. The circuitry may assert one of several electrical configurations on the cabling that electrically connects the portable device to the external device to indicate to the external device a desired voltage level.