Dialog Semiconductor (uk) Limited

Dialog Semiconductor Gmbh

Fabio Rigoni

Mihail Jefremow

Stephan Drebinger

Dan Ciomaga

Alessandro Angeli

Marcus Weis

Jan Grabinski

Gennadii Tatarchenkov

Jerome Sanchez

Ali Zahabi

Holger Petersen

Otto Schumacher

Selcuk Talay

Petrus Hendrikus Seesink

Olivier Girard

Hartmut Sturm

Joao Paulo Trierveiler Martins

Qiao Yang

Simon Stark

Joao Martins

A circuit and a method for providing a switchable current linkage between a first terminal and a second terminal is presented. The circuit has a transistor switch and a charge pump circuit. An output node of the charge pump circuit is coupled to a control terminal of the transistor device, and an input node of the charge pump circuit is coupled to a predetermined voltage. The charge pump generates a boosted voltage. A drive circuit provides feedback control for the current flowing through the transistor. The drive circuit also controls the voltage magnitude at the input node of the charge pump circuit in accordance with the feedback control or to control a magnitude of a voltage at the control terminal of the transistor device in accordance with the feedback control.

Low resistive load switch with output current control

A DC/DC power converter and a method to convert an input voltage into an output voltage are presented. The power converter may have a first flying capacitor, a second flying capacitor, an inductor, and switching elements. It may control the switching elements such that the switching elements establish a first magnetizing current path from the input node, via the first flying capacitor, via the second flying capacitor, via the inductor, to the output node. The converter may control the switching elements to interrupt said first magnetizing current path after a pre-determined time interval. The converter may control the switching elements such that the switching elements establish a demagnetizing current path from a reference potential via the inductor to the output node. The converter may control the switching elements such that said demagnetizing current path is interrupted when a current through the inductor reaches a pre-determined threshold current value.

Implicit on-time regulated hybrid converter

A circuit and a method for providing a switchable current linkage between a first terminal and a second terminal is presented. The circuit has a transistor switch and a charge pump circuit An output node of the charge pump circuit is coupled to a control terminal of the transistor device, and an input node of the charge pump circuit is coupled to a predetermined voltage. The charge pump generates a boosted voltage. A drive circuit provides feedback control for the current flowing through the transistor. The drive circuit also controls the voltage magnitude at the input node of the charge pump circuit in accordance with the feedback control or to control a magnitude of a voltage at the control terminal of the transistor device in accordance with the feedback control.

A digital voltage regulator and a method to regulate an output voltage at an output node based on an input voltage is presented. The regulator has a driver stage with N driver slices, with N&#x3e;1. Each of the N driver slices can be activated or deactivated individually. A driver slice comprises a current source to provide an output current component to the output node, if the driver slice is activated. Furthermore, the regulator has a control unit to activate a number n of the N driver slices, based on a deviation of a feedback voltage from a reference voltage, where the feedback voltage is dependent on the output voltage.

Voltage regulator and method for providing an output voltage with reduced voltage ripple

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.

Linear charger circuit and method of operating linear charger circuit

A circuit for generating an output voltage, and regulating the output voltage to a target voltage, is described. The circuit comprises a pass device coupled between an input voltage level and an output voltage level, an error amplifier stage configured to generate a first control voltage on the basis of a reference voltage and the output voltage, a buffer stage configured to generate a drive signal for the pass device on the basis of the first control voltage, and a tracking circuit configured to track a voltage across the pass device and to generate a second control voltage on the basis of the voltage across the pass device. The buffer stage comprises a variable resistance element, for limiting a current flowing through the buffer stage on the basis of the second control voltage.

Quiescent current control in voltage regulators

A voltage regulator to provide a load current at an output node is presented. The voltage regulator has a pass transistor for providing the load current at the output node from an input node. The voltage regulator contains a driver stage to set a gate voltage at a gate of the pass transistor based on a drive voltage at a gate of a drive transistor. The voltage regulator has voltage regulation means to set the drive voltage in dependence of an indication of the output voltage at the output node and in dependence of a reference voltage for the output voltage. The driver stage has the drive transistor and a diode transistor, wherein the diode transistor forms a current mirror with the pass transistor. The driver stage has a current amplifier amplifies a drive current through the drive transistor to provide an amplified current through the diode transistor.

Voltage regulator with drive voltage dependent on reference voltage

This application relates to a circuit for generating an output voltage and regulating the output voltage to a target voltage. The circuit includes a switchable voltage divider circuit configured to generate a feedback voltage that is a variable fraction of the output voltage, an error amplifier stage configured to generate a control voltage on the basis of a reference voltage and the variable fraction of the output voltage, a buffer stage configured to generate the output voltage on the basis of the control voltage, and a charge injection circuit configured to inject charge at an intermediate node between the error amplifier stage and the buffer stage to thereby modify the control voltage generated by the error amplifier stage. The application further relates to a method of operating such circuit.

Charge injection for ultra-fast voltage control in voltage regulators

A voltage regulator which provides at an output node a load current at an output voltage is described. The voltage regulator comprises a pass transistor for providing the load current at the output node from an input node, and a driver stage configured to set the gate voltage of the pass transistor based on a drive current. The voltage regulator has voltage regulation means to set the drive current in dependence of an indication of the output voltage at the output node and in dependence of a reference voltage for the output voltage. The voltage regulator has bypass regulation means to set the drive current in dependence of an indication of the gate-to-source voltage at the pass transistor and in dependence of a target voltage for the gate&#x2014;to activate the voltage regulation means and/or the bypass regulation means. source voltage. The voltage regulator also comprises mode selection means.

Bypass mode for voltage regulators

A linear regulator is presented. It comprises a first amplifier stage, one of the inputs being coupled with the output of the linear regulator. It has an intermediate amplifier stage. The input of the intermediate amplifier stage is coupled to the output of the first amplifier stage. It has a driver stage having a pass device driven by the output of the driver stage. The output of the pass device provides the output of the linear regulator. The regulator has a voltage-to-current feedback circuit coupled with the driver stage and the output of the first amplifier stage for regulating the output resistance of the first amplifier stage depending on load conditions of the linear regulator. The voltage-to-current feedback circuit has a transistor and a current limitation circuit to limit the regulation of the output resistance of the first amplifier stage to low load conditions of the linear regulator.

Linear regulator with improved stability

The present document relates to a current sensing and/or control circuit with reduced sensing errors. A current control circuit for controlling a load current into an electronic device is described. The current control circuit comprises an array of control transistors configured to adjust the load current provided at an output of the array of control transistors. The load current is drawn from a power supply at an input voltage. Furthermore, the power supply is coupled to an input of the array of control transistors. The circuit further comprises a reference transistor coupled to the power supply at an input of the reference transistor and a reference current source configured to draw a reference current at an output of the reference transistor.

Current limit control with constant accuracy

A method for charging a battery is provided, wherein current pulses are supplied to the battery, wherein each pulse is followed by a rest period during which no current is supplied to the battery, and wherein the state of charge of the battery is determined during the rest period.

Device and method for charging a battery

A driver circuit for a switched-mode power converter is configured to perform hysteretic control of a switched-mode power converter. The switched-mode power converter comprises an inductor configured to store energy during a first state of the switch and to release energy towards a load of the switched-mode power converter during a second state of the switch. The driver circuit comprises a filter unit which is configured to determine a command signal based on a gate control signal applied to a gate of the switch. The command signal is indicative of a current through the inductor. The driver circuit comprises hysteretic control circuitry configured to generate the gate control signal based on the command signal; wherein the switch alternates between the first and second state when being subjected to the gate control signal.

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Karlsfeld, Germany

Fabio Rigoni