The ft2925 is a highly efficient 2 x 6W Class-G stereo audio power amplifier with automatic level control (ALC)and battery tracking AGC. It integrates dual filterless Class-D audio amplifiers with a multi-level Class-G synchronous boost regulator and operates with a range of supply voltages from 3V to 5.5V. When operating with a 3.6V supply voltage, the ft2925 can deliver an output power of 6W per channel with 10% THD+N, or an ALC output power of 4.5W per channel with 0.3% THD+N, into a pair of 4Ω speakers.

    In ft2925, the power supply rails of the audio amplifiers’output stages are internally boosted and regulated by a synchronous PWM switching regulator with two integrated power switches. The boost regulator employs current-mode PWM control with proprietary multi-level Class-G operation to regulate the boosted output voltage dynamically in response to the voltage level of the audio outputs. 

    The ft2925 features ALC function to constantly monitor and safeguard the audio outputs against the boosted supply voltages, preventing output clipping distortion,excessive power dissipation, and speaker over-load.Once an over-level condition is detected in either channel, the ALC lowers the voltage gain of both audio amplifiers together to limit the peak audio outputs.

    In conjunction with ALC, as the battery supply voltage drops below a prescribed value, the battery tracking AGC lowers the voltage gain of both audio amplifiers to limit the peak audio outputs, preventing the collapse of battery voltage.FT2925 Available in TSSOP-28L package