Boost regulators with dynamic regulation band
AssigneeSkyworks Solutions, Inc.
InventorsGeorge A. Hariman, Chak S. Ngai, Wendy Ng
Life of this patent
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Abstract
Apparatus and methods for boost regulators with dynamic regulation band are disclosed. In certain configurations, a boost regulator system includes a boost regulator, a current source, and a light emitting element, such as a flash LED, that is controlled using a current generated by the current source. The boost regulator generates an output voltage that is used to power the current source. The boost regulator operates with a regulation band that changes based on a current level of the light emitting element.
Claims21
(canceled)
A mobile device comprising:
- a light emitting element;
- a current source powered by a regulator output voltage and configured to generate a current that controls an amount of light emitted from the light emitting element;
- and
- a boost regulator configured to generate the regulator output voltage based on a reference voltage, the boost regulator including a headroom detection circuit configured to generate a headroom signal indicating an amount of voltage headroom of the current source, and a regulator control circuit configured to control a voltage level of the reference voltage based on the headroom signal and a current level of the light emitting element.
An electronic system comprising:
- a light emitting diode;
- a current source powered by a regulator output voltage and configured to generate a current that controls an amount of light emitted from the light emitting diode;
- a power source;
- and
- a boost regulator powered by the power source and configured to generate the regulator output voltage based on a reference voltage, the boost regulator including a headroom detection circuit configured to generate a headroom signal indicating an amount of voltage headroom of the current source, and a regulator control circuit configured to control a voltage level of the reference voltage based on the headroom signal and a current level of the light emitting diode.
A method of controlling illumination in an electronic system, the method comprising:
- powering a current source using a regulator output voltage from a boost regulator;
- controlling an amount of light emitted from a light emitting element using a current of the current source;
- generating a headroom signal indicating an amount of voltage headroom of the current source;
- and
- controlling a reference voltage of the boost regulator based on the headroom signal and a current level of the light emitting element.
Dependencies are inferred from the claim text.