Class-G headphone and Class-D speaker amps enable power efficient audio amplification

Fairchild Semiconductor has developed the FAB1200 stereo Class-G ground-referenced headphone amplifier with integrated buck converter and the FAB2200 audio subsystem with stereo Class-G headphone amplifier and 1.2W Class-D mono speaker amplifier.

FAB1200 features a charge pump, which generates a negative supply voltage that allows the headphone output to be ground-centered and capacitor-free, eliminating up to two external capacitors. An integrated inductive buck regulator provides direct battery connection and adjusts the supply voltage between two different levels based on the output signal level resulting in reduced power consumption.

FAB2200 is an audio subsystem that combines a capacitor-free stereo Class-G headphone amplifier with a Class-D speaker amplifier. A proprietary integrated charge pump generates multiple supply rails for a ground-centered Class-G headphone output. The filter less Class-D amplifier can be connected directly to a speaker without the need for two external filter networks. The device also features Automatic Gain Control, which limits the maximum speaker output levels to protect speakers without introducing distortion. It can also dynamically limit clipping as the battery voltage falls and available in a 25-bump, 0.4mm pitch, WLCSP package.

According to Fairchild FAB1200 and FAB2200 mobile audio ICs make handsets, tablets/MIDs, and other portable audio applications sound louder and better while reducing overall systems cost and minimizing the impact on battery runtime.

Package: 16-bump, 0.4mm pitch, 1.56mm x 1.56mm WLCSP package.
Available: Now in samples
Price: FAB1200 for $0.36, FAB2200 for $0.57 for 1K pieces