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公开(公告)号：US10700675B2
公开(公告)日：2020-06-30
申请号：US16544477
申请日：2019-08-19
发明人： Jae Won Choi , Sungho Beck , Richard Turkson , Johnny Klarenbeek , Bixia Li
摘要： Channel switchover power multiplexer circuits, and methods of operating the same are disclosed. An example power multiplexer a first transistor coupled to a first input, a second transistor coupled to the first transistor to couple a first voltage at the first input to an output, a third transistor coupled to a second input, a fourth transistor coupled to the third transistor to couple a second voltage at the second input to the output, a diode amplifier to provide a third voltage to a gate of the first transistor to block a reverse current, and a soft-start amplifier to provide a fourth voltage to a gate of the fourth transistor to turn on (with adjustable VOUT ramp rate) the fourth transistor with a constant ramp rate.
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公开(公告)号：US10432175B2
公开(公告)日：2019-10-01
申请号：US16119457
申请日：2018-08-31
发明人： Jae Won Choi , Sungho Beck , Abidur Rahman
摘要： Apparatus, devices, and systems to provide a low quiescent current load switch are disclosed. A disclosed load switch circuit includes a transconductor to convert a voltage to a current input to a transistor gate, the current input to the transistor gate to control the gate to deliver power to a load from a power supply. The example circuit includes a resistor to provide power from a charge pump to the gate as controlled by the transconductor. A disclosed apparatus includes a driver to control a gate of a transistor, the gate to enable the transistor to deliver power to a load from a power supply when the gate is activated, and a gate slope control to control a rate of change over time of a voltage associated with the gate to activate the gate and to disable the driver when the gate is activated.
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公开(公告)号：US10756731B2
公开(公告)日：2020-08-25
申请号：US16279422
申请日：2019-02-19
发明人： Richard Turkson , Sungho Beck , Jae Won Choi , Johnny Klarenbeek
IPC分类号： H03K17/693
摘要： A power source multiplexer includes a first switch circuit connected between a first input voltage source node and an output voltage node. A second switch circuit is connected between a second input voltage source node and the output voltage node. A driver circuit is configured to provide a steady-state current to drive one of the first or second switch circuits to electrically connect the respective input voltage source node to the output voltage node. A boost circuit is configured to boost the steady-state current for a switching time interval when switching from one of the input voltage source nodes being connected to the output node to the other of the input voltage source nodes being connected to the output voltage node.
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公开(公告)号：US10432184B1
公开(公告)日：2019-10-01
申请号：US16217658
申请日：2018-12-12
发明人： Jae Won Choi , Sungho Beck , Richard Turkson , Johnny Klarenbeek , Bixia Li
摘要： Channel switchover power multiplexer circuits, and methods of operating the same are disclosed. An example power multiplexer a first transistor coupled to a first input, a second transistor coupled to the first transistor to couple a first voltage at the first input to an output, a third transistor coupled to a second input, a fourth transistor coupled to the third transistor to couple a second voltage at the second input to the output, a diode amplifier to provide a third voltage to a gate of the first transistor to block a reverse current, and a soft-start amplifier to provide a fourth voltage to a gate of the fourth transistor to turn on (with adjustable VOUT ramp rate) the fourth transistor with a constant ramp rate.
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公开(公告)号：US10432185B1
公开(公告)日：2019-10-01
申请号：US16119902
申请日：2018-08-31
发明人： Jae Won Choi , Richard Turkson
IPC分类号： H03K17/0812 , H01L27/06
摘要： A system includes a storage capacitor coupled between an input voltage source and a ground terminal, a voltage sensing circuit coupled to the input voltage source and to the storage capacitor, a first transistor coupled to the voltage sensing circuit, a current mirror circuit coupled to the first transistor, a diode coupled between the storage capacitor and the current mirror circuit, and a second transistor configured to couple between a gate of a power switching device and the ground terminal. A gate of the second transistor is coupled to the storage capacitor by way of the voltage sensing circuit.
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公开(公告)号：US20200052683A1
公开(公告)日：2020-02-13
申请号：US16544477
申请日：2019-08-19
发明人： Jae Won Choi , Sungho Beck , Richard Turkson , Johnny Klarenbeek , Bixia Li
摘要： Channel switchover power multiplexer circuits, and methods of operating the same are disclosed. An example power multiplexer a first transistor coupled to a first input, a second transistor coupled to the first transistor to couple a first voltage at the first input to an output, a third transistor coupled to a second input, a fourth transistor coupled to the third transistor to couple a second voltage at the second input to the output, a diode amplifier to provide a third voltage to a gate of the first transistor to block a reverse current, and a soft-start amplifier to provide a fourth voltage to a gate of the fourth transistor to turn on (with adjustable VOUT ramp rate) the fourth transistor with a constant ramp rate.
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公开(公告)号：US20190214973A1
公开(公告)日：2019-07-11
申请号：US16119457
申请日：2018-08-31
发明人： Jae Won Choi , Sungho Beck , Abidur Rahman
CPC分类号： H03K3/012 , H02M3/26 , H03K17/04123 , H03K17/165 , H03K2217/0036 , H03K2217/0081
摘要： Apparatus, devices, and systems to provide a low quiescent current load switch are disclosed. A disclosed load switch circuit includes a transconductor to convert a voltage to a current input to a transistor gate, the current input to the transistor gate to control the gate to deliver power to a load from a power supply. The example circuit includes a resistor to provide power from a charge pump to the gate as controlled by the transconductor. A disclosed apparatus includes a driver to control a gate of a transistor, the gate to enable the transistor to deliver power to a load from a power supply when the gate is activated, and a gate slope control to control a rate of change over time of a voltage associated with the gate to activate the gate and to disable the driver when the gate is activated.
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公开(公告)号：US10038377B2
公开(公告)日：2018-07-31
申请号：US15232646
申请日：2016-08-09
IPC分类号： H02M3/158
摘要： One example includes a power supply system. The system includes a power stage comprising at least one power switch that is periodically activated during an on-time of a duty-cycle based on a switching signal to generate an output voltage at an output. The system also includes a switching controller configured to generate the switching signal based on an amplitude of a capacitor voltage at a control node associated with a capacitor that defines the on-time of the duty-cycle as a function of the capacitor being periodically charged. The switching controller includes a pre-bias stage configured to apply a pre-bias charge to the capacitor via an offset voltage prior to a start of the on-time to pre-charge parasitic capacitance associated with the power supply system prior to the start of the on-time.
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