Boost converter voltage controlled based on audio signal

A method, comprising:

• receiving, at a controller, an audio signal;
• configuring, by the controller, a boost converter for a boost voltage based, at least in part, on the received audio signal, wherein the boost converter generates the boost voltage by:
• building current in an inductor in a first phase;
• and
• discharging current from the inductor to a capacitor during a second phase;
• and
• amplifying, at an amplifier coupled to the processor and the boost converter, the audio signal based, at least in part, on the boost voltage of the boost converter.

An integrated circuit, comprising:

• an input node configured to receive an audio signal;
• an output node configured to output an amplified audio signal to drive a load;
• an audio amplifier coupled to the input node and configured to amplify the audio signal to generate the amplified audio signal;
• a boost converter coupled to the audio amplifier and configured to generate a boost voltage, wherein the boost converter comprises:
• an inductor coupled to a supply voltage;
• a capacitor coupled to the audio amplifier;
• a first switch coupled to the inductor and to a ground;
• and
• a second switch coupled to the first switch and to the audio amplifier;
• a low voltage converter coupled to the audio amplifier and configured to generate a low voltage;
• a controller coupled to the boost converter, the input node, and the low voltage converter, wherein the controller is configured to:
• receive the audio signal;
• configure the audio amplifier for amplifying the audio signal based on the low voltage when the audio signal is smaller in amplitude than the low voltage;
• and
• configure the audio amplifier for amplifying the audio signal based on the boost voltage when the audio signal is higher in amplitude than the low voltage.