Abstract: An energy storage element control circuit includes a charge transistor having a first node adapted to be coupled to an output node of the energy storage element control circuit and a second node adapted to be coupled to a terminal of an energy storage element. The energy storage control circuit also includes a boot capacitor having a first node and a second node. The energy storage element further includes a comparator that includes a first input node coupled to the first node of the charge transistor and a second input node adapted to be coupled to the terminal of the energy storage element. The comparator also includes an output node.

Abstract: An energy storage element control circuit includes a charge transistor having a first node adapted to be coupled to an output node of the energy storage element control circuit and a second node adapted to be coupled to a terminal of an energy storage element. The energy storage control circuit also includes a boot capacitor having a first node and a second node. The energy storage element further includes a comparator that includes a first input node coupled to the first node of the charge transistor and a second input node adapted to be coupled to the terminal of the energy storage element. The comparator also includes an output node.

Abstract: Methods and systems are presented for charging and/or discharging multiple parallel-connected battery packs in portable electronic devices, in which a charging or discharging current of a second battery pack is regulated based at least in part on a charging or discharging current of a first battery pack.

Abstract: A voltage clamping circuit includes a current source having a fixed current source and a variable current source and a variable resistor receiving current from the current source. The variable resistor varies its resistance in response to an environmental operating condition. The voltage clamping circuit also includes an amplifier configured to compare a sensor node voltage with a reference voltage, the sensor node voltage being in communication with the voltage drop across the variable resistor. The amplifier is configured and connected to provide a control output to control the variable current source to modify current output from the variable current source to at least in part prevent the sensor node voltage from exceeding a reference voltage when certain operating conditions are present.

Abstract: A voltage clamping circuit includes a current source having a fixed current source and a variable current source and a variable resistor receiving current from the current source. The variable resistor varies its resistance in response to an environmental operating condition. The voltage clamping circuit also includes an amplifier configured to compare a sensor node voltage with a reference voltage, the sensor node voltage being in communication with the voltage drop across the variable resistor. The amplifier is configured and connected to provide a control output to control the variable current source to modify current output from the variable current source to at least in part prevent the sensor node voltage from exceeding a reference voltage when certain operating conditions are present.

Abstract: A voltage clamping circuit includes a current source having a fixed current source and a variable current source and a variable resistor receiving current from the current source. The variable resistor varies its resistance in response to an environmental operating condition. The voltage clamping circuit also includes an amplifier configured to compare a sensor node voltage with a reference voltage, the sensor node voltage being in communication with the voltage drop across the variable resistor. The amplifier is configured and connected to provide a control output to control the variable current source to modify current output from the variable current source to at least in part prevent the sensor node voltage from exceeding a reference voltage when certain operating conditions are present.