Fast settlement of supplement converter for power loss protection system

A method comprising:

• (a) conducting current through a current switch circuit from a first terminal, through the current switch circuit, and out of a second terminal;
• (b) operating a prebias circuit so that the prebias circuit supplies a prebias signal onto a control loop node of a switching converter;
• (c) detecting a switch over condition;
• (d) in response to the detecting of the switch over condition in (c) disabling the prebias circuit so that the prebias circuit no longer supplies the prebias signal onto the control loop node;
• and
• (e) in response to the detecting of the switch over condition in (c) begin operating the switching converter as a buck converter so that the switching converter converts a higher voltage present on a third terminal into a lower voltage that the switching converter supplies onto the second terminal;
• wherein the prebiasing circuit is enabled to drive the prebias signal onto the control loop node at a time immediately prior to the operating the switching converter as a buck converter.

An integrated circuit comprising:

• a first terminal;
• a second terminal;
• a current switch circuit that has an on state and an off state, wherein in the on state the current switch circuit provides a low resistance current path from the first terminal, through the current switch circuit, out of the integrated circuit via the second terminal, and to an output node, and wherein in the off state the current switch circuit decouples the first terminal from the second terminal;
• a third terminal;
• a switching converter control circuit that is a part of a switching converter, wherein the switching converter has a buck on state, wherein the switching converter control circuit is coupled to receive a voltage from the third terminal such that the switching converter in the buck on state drives a regulated lower voltage onto the output node, wherein the switching converter control circuit has a control loop node, wherein if the switching converter is not in the buck on state then the switching converter does not drive any regulated voltage onto the output node, and wherein the current switch circuit is in the off state if the switching converter is in the buck on state;
• and
• a prebiasing circuit that is coupled to drive a prebias signal onto the control loop node at a time immediately prior to the switching converter entering the buck on state, and wherein the prebiasing circuit is disabled from driving the prebias signal upon the switching converter entering the buck on state.