Dual-level detection to reduce voltage droop on critical battery voltage nodes

A method comprising, in a power delivery system having a power converter configured to electrically couple to a power source and further configured to supply electrical energy to one or more loads electrically coupled to an output of the power converter:

• determining whether a voltage node in the power delivery system indicative of a terminal voltage of the power source has fallen below a warning threshold voltage;
• determining whether the voltage node has fallen below a critical threshold voltage, wherein the critical threshold voltage is lesser than the warning threshold voltage;
• in response to a voltage of the voltage node falling below the warning threshold voltage, decreasing a maximum current drawn by the power converter from a first current level to a second current level;
• and
• in response to a voltage of the voltage node falling below the critical threshold voltage, decreasing a maximum current drawn by the power converter from the second current level to a third current level.

A mobile device, comprising:

• a power source;
• one or more loads;
• a power converter electrically coupled to the power source and further configured to supply electrical energy to the one or more loads;
• and
• control circuitry configured to:
• determine whether a voltage node in the power delivery system indicative of a terminal voltage of the power source has fallen below a warning threshold voltage;
• determine whether the voltage node has fallen below a critical threshold voltage, wherein the critical threshold voltage is lesser than the warning threshold voltage;
• in response to a voltage of the voltage node falling below the warning threshold voltage, decrease a maximum current drawn by the power converter from a first current level to a second current level;
• and
• in response to a voltage of the voltage node falling below the critical threshold voltage, decrease a maximum current drawn by the power converter from the second current level to a third current level.