ft2920

ft2920 8W Boosted Class-G Audio Power Amplifier with Automatic Level Control & Battery Tracking AGC GENERAL DESCRIPTION The ft2920 is a highly efficient 8W boosted Class-G audio power amplifier with automatic level control (ALC) and battery tracking AGC. It integrates a filterless Class-D audio amplifier with an adaptive multi-level Class-G boost regulator and operates with a range of supply voltages from 3V to 5.5V. When a supply voltage at 3.6V, the ft2920 can deliver an output power of 8W with 10% THD+N, or an ALC output power of 6W with 0.4% THD+N, into a 4Ω speaker load. In ft2920, the power supply rail of the audio amplifier’s output stage is internally boosted and regulated by an asynchronous PWM switching regulator with an integrated power switch. The boost regulator employs current-mode PWM control with proprietary multi-level operation to regulate the boosted supply voltage in response to the voltage level of the audio output. To facilitate various output power applicatio...