Fast transient high-side gate driving circuit
AssigneeQUALCOMM Incorporated
InventorsTaewoo Kwak, Joseph Rutkowski
Life of this patent
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Abstract
Techniques for improving the transient response in a switching converter are provided. An example of a gate driving circuit for driving a high-side switch in a switching converter according to the disclosure includes a first switch operably coupled to a source lead and a gate lead of the high-side switch, a first super source follower circuit operably coupled to the gate lead of the high-side switch, and a mid-voltage power supply operably coupled to the first super source follower circuit.
Claims26
A gate driving circuit for driving a high-side switch in a switching converter, comprising:
- a first switch operably coupled to a source lead and a gate lead of the high-side switch;
- a first super source follower circuit operably coupled to the gate lead of the high-side switch, wherein the first super source follower circuit includes at least a p-channel semiconductor switch, a n-channel semiconductor switch and a resistor;
- and
- a mid-voltage power supply operably coupled to the first super source follower circuit.
A method of constructing a switched-mode power converter, comprising:
- configuring the switched-mode power converter including at least a high-side switch and a low-side switch based on a desired output voltage;
- operably coupling a gate driving circuit to the high-side switch, wherein the gate driving circuit includes a first switch and a first super source follower circuit;
- operably coupling a mid-voltage power supply to the first super source follower circuit, wherein a mid-voltage power supply voltage is based on the desired output voltage and a gate-to-source voltage rating of the high-side switch;
- and
- operably coupling a second super source follower circuit between the first super source follower circuit and the mid-voltage power supply.
A gate driving circuit, comprising:
- a power stage switch including a gate-source voltage rating and a drain-source voltage rating, wherein the gate-source voltage rating is lower than the drain-source voltage rating;
- a first super source follower circuit operably coupled to a gate lead of the power stage switch, wherein the first super source follower circuit includes at least a p-channel semiconductor switch, a n-channel semiconductor switch and a resistor;
- and
- a mid-voltage power supply operably coupled to the first super source follower circuit.
An apparatus, comprising:
- a power converter means including a power stage switch;
- a gate driving means operably coupled to the power stage switch, wherein the gate driving means includes a first super source follower circuit;
- and
- a mid-voltage power means operably coupled to the first super source follower circuit, and
- a second super source follower circuit operably coupled between the first super source follower circuit and the mid-voltage power means.
Dependencies are inferred from the claim text.