Multi-mode power management apparatus

A wireless device comprising a multi-mode power management apparatus, the multi-mode power management apparatus comprises:

• a power management integrated circuit (PMIC) configured to generate a low-frequency current and a low-frequency voltage;
• an envelope tracking (ET) integrated circuit (ETIC) comprising:
• a first node coupled to the PMIC;
• a second node coupled to the first node via a multifunction circuit;
• a first voltage circuit configured to generate a first ET voltage based on a first ET target voltage;
• a second voltage circuit configured to generate a second ET voltage based on a second ET target voltage;
• and
• a control circuit configured to:
• cause the first node and the second node to output one or more of the first ET voltage, the second ET voltage, and the low-frequency voltage;
• and
• cause the first node and the second node to output at least the low-frequency current;
• and
• a multi-stage power amplifier circuit coupled to the first node and the second node and configured to amplify a radio frequency (RF) signal, wherein the first ET target voltage is delayed from the second ET target voltage to accommodate for a temporal delay inside the multi-stage power amplifier circuit.