GENERAL DESCRIPTION
The ft2128 is a high-efficiency, high-performance, Class-D audio power amplifier with dual modes of automatic level control (ALC). It operates from 3V to 5.5V supply. When powered with 5V supply voltage, it is capable of delivering a continuous average output of 3.4W into 3Ω load or 2.8W into 4Ω load with 4% THD+N.

FEATURES
● Wide supply voltage range from 3V to 5.5V
● Filterless Class-D operation
● Automatic level control to eliminate output
   clipping
● Dual ALC modes of operation
● High efficiency up to 90%
● Constant output power at 5V supply (ALC-1)
   3.2W (3Ω load, 1% THD+N)
   2.6W (4Ω load, 1% THD+N)
   1.4W (8Ω load, 1% THD+N)
● Constant output power at 5V supply (ALC-2)
   3.4W (3Ω load, 4% THD+N)
    2.8W (4Ω load, 4% THD+N)
    1.5W (8Ω load, 4% THD+N)
● ALC Range: 12dB
● Low quiescent current: 3mA @ VDD=3.6V
● Analog or digital scheme to set ALC operating
   mode
● Short-circuit & thermal overload protection
● Available in SOP-8L & MSOP-8L packages

APPLICATIONS
● Portable navigation devices
● Multimedia internet devices
● Portable or Blue-tooth speakers