ft4888 The ft4888 is a 2.1W bridge-connected dual audio amplifier. When supplied with 5V voltage, the ft4888 can deliver 2.1W to a 4Ω load or 2.4W to 3Ω load with the THD+N rate lower than 1.0%. The dual audio power amplifier design of ft4888 provides high quality dual-channel output while requiring few external components and consuming very little PCB space. With two device selection inputs (HP_LOGIC and HP_SENSE) of different logic level thresholds respectively, the ft4888 can connect to a pair of dual-channel speakers or to a stereo headphone. The HP_SENSE logic connects to the headphone jack to detect if headphone is present. The other logic, HP_LOGIC, is determined by standard logic level standards. The ft4888 also features an optional 3D enhancement design which can help widen the perceived soundstage from a stereo audio signal to improve stereo channel sounding effect. The ft4888’s power-saving feature is another plus tailored for handheld device. When the power-saving mechanism is activated, only 0.04μA current is running on the ft4888. Other features such as thermal shutdown protection and “click and pops” reduction during power-up ensure the safety and reliability in real applications. Features ·Dual channel audio amplifier design ·User-configurable headphone select scheme ·3D effect enhancement ·Micro power shutdown mode ·Thermal shutdown protection ·Improved “click and pop” suppression circuitry ·Space-saving 4mm x 4mm QFN-24 package. Product Brief        DataSheet        Application Note