The AUD4990 is an audio power amplifier for mobile  phone and  other  portable  electronic  device  applications.  It  can deliver 1.3 watts of continuous average power to an8 ohm BTL  (bridge  tied  load)  and  2  watts  of  continuous  average power to a 4 ohm BTL, with less than 1% distortion from a 5V DC power supply.

The AUD4990 is specifically designed to provide high output power  with  a  minimal  amount  of  external  components. It requires no output coupling capacitors, for instance. Because
of its space-saving footprint, it perfectly meets the needs of mobile  phones,  PDAs,  notebook  computers  and  other low-voltage applications that require small power sources in
a small package.