Louder and clear speaker sound in mobile devices, are two of the challenges designers face on a regular basis. To address some of the challenges involved with making small speakers sound Louder and Better in mobile devices, Fairchild Semiconductor has developed a 2.3 watt class-D audio amplifier with integrated boost regulator and battery automatic gain control (AGC).
The device has an integrated boost regulator that allows for high audio output power over a power supply range of 2.5V to 5.2V from a 3.6V Li-Ion battery.
At low power output, the device’s boost regulator automatically shuts down for greater efficiency and lower quiescent current consumption, resulting in longer battery runtime. The FAB3103 audio amplifier also features battery automatic gain control (AGC) that reduces gain when the power supply voltage is low, in order to limit maximum power consumption, reducing distortion and preventing early device shutdown.
The solution is available in a 12-bump, WL-CSP and has several protection features including short circuit protection, low voltage shutdown, and click and pop suppression. Additionally, the low EMI design of the device allows for filterless operation with high noise rejection using differential audio inputs, improving sound 
quality.
Fairchild Semiconductor
