Power Bootstrapping for Lowering Quiescent Current

摘要

A circuit includes a switching regulator that produces a first voltage supply output and that includes an operational supply input. The operational supply input may provide power for running the logic in the switching regulator. The circuit also includes a linear regulator that produces a second voltage supply output. A control circuit accepts the first voltage supply output and the second voltage supply output and includes a power output connected to the operational supply input. The control circuit is configured to pass the second voltage supply output to the power output until the first voltage supply output is established. After the first voltage supply is established, the control circuit instead passes the first voltage supply output to the power output through the control circuit. The first voltage supply output may also then provide power to the circuitry that would otherwise have been powered by the linear regulator.

主权项

1. A circuit comprising:
a switching regulator comprising:
a first voltage supply output andan operational supply input; a linear regulator comprising a second voltage supply output; and a control circuit comprising:
connections for the first voltage supply output and the second voltage supply output; anda power output connected to the operational supply input,the control circuit configured to:
provide the second voltage supply output to the power output until the first voltage supply output is established; andafter the first voltage supply is established, instead provide the first voltage supply output to the operational supply input through the power output.