Synchronous switching converter and associated integrated semiconductor device
AssigneeChengdu Monolithic Power Systems Co., Ltd.
InventorsHuaifeng Wang, Eric Braun
Life of this patent
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Abstract
A synchronous switching converter has an integrated semiconductor device. The integrated semiconductor device has a first semiconductor component and a second semiconductor component coupled in parallel. The first semiconductor component has MOSFET cells with body diodes, and the second semiconductor component has diode cells or MOSFET cells with a low forward voltage. Cells of the second semiconductor component distribute among the first semiconductor component unevenly according to a distribution of a current flowing through the integrated semiconductor device.
Claims16
An integrated semiconductor device utilized in synchronous switching converters, comprising:
- a first semiconductor component, comprising a first Metal Oxide Semiconductor Field Effect Transistor (MOSFET) with a body diode, wherein the first MOSFET has a source, a drain and a gate;
- and
- a second semiconductor component, coupled in parallel with the first semiconductor component, wherein the second semiconductor component comprises a diode with an anode and a cathode, wherein the anode of the diode is coupled to the source of the first MOSFET, the cathode of the diode is coupled to the drain of the first MOSFET, wherein a forward voltage of the diode is lower than a forward voltage of the body diode in the first MOSFET;
- wherein
- cells of the second semiconductor component are configured to distribute among the first semiconductor component unevenly according to a distribution of a current flowing through the integrated semiconductor device.
An integrated semiconductor device utilized in synchronous switching converters, comprising:
- a first semiconductor component, comprising a first Metal Oxide Semiconductor Field Effect Transistor (MOSFET) with a body diode, wherein the first MOSFET has a source, a drain and a gate;
- and
- a second semiconductor component, coupled in parallel with the first semiconductor component, wherein the second semiconductor component comprises a second MOSFET, the second MOSFET has a source, a drain and a gate, the drain of the second MOSFET in the second semiconductor component is coupled to the drain of the first MOSFET, both the source and the gate of the second are coupled to the source of the first MOSFET, and a threshold voltage of the second MOSFET is lower than a threshold voltage of the first MOSFET, wherein the threshold voltage of the first MOSFET is a lowest voltage needed to turn on the first MOSFET, the threshold voltage of the second MOSFET is a lowest voltage needed to turn on the second MOSFET;
- wherein
- cells of the second semiconductor component are configured to distribute among the first semiconductor component unevenly according to a distribution of a current flowing through the integrated semiconductor device.
A synchronous switching converter, having an input terminal and an output terminal utilized to provide an output signal, the synchronous switching converter comprising:
- an input capacitor, having a first terminal and a second terminal, wherein the first terminal is coupled to the input terminal, the second terminal is coupled to a system ground;
- a power switch, configured to adjust the output signal;
- an inductor, configured to store energy when the power switch is on and release energy when the power switch is off;
- a synchronous switch, configured to be an integrated semiconductor device to provide a path for a current of the inductor when the power switch is off, wherein the integrated semiconductor device comprises a first semiconductor component and a second semiconductor component coupled in parallel, cells of the second semiconductor component are configured to distribute among the first semiconductor component unevenly according to a distribution of a current flowing through the inductor;
- and
- an output capacitor, having a first terminal and a second terminal, wherein the first terminal of the output capacitor is coupled to the output terminal, the second terminal of the output capacitor is coupled to the system ground.
Dependencies are inferred from the claim text.