Audio amplifiers such as TAS2562, TAS2563, TAS2764, TAS2770, and others are often used in battery powered applications such as Bluetooth speakers, cell phones, PCs, and other handheld electronics may demand more power than can be normally provided by the battery at the end of a typical charge cycle. Battery voltage (VBAT) tracking and brown out protection features are available to help prolong usable battery life and prevent the audio power demands from causing the entire system to shutdown prematurely.