GENERAL DESCRIPTION The ft2708 is a high efficiency, low EMI, filterless stereo Class-D audio power amplifier with automatic level control (ALC). It operates from 3.0V to 5.5V supply. When powered with 5V supply voltage, the ft2708 is capable of delivering 3.2W into a pair of 4Ω speakers or 1.8W into a pair of 8Ω speakers, with THD + D less than 10%. The ft2708 features ALC on the audio output signals, which detects the output clipping caused by the over-level input signal and automatically adjusts the voltage gain of the amplifier to eliminate the clipping while maintaining a maximally-allowed dynamic range of the audio output signals. The ALC also eliminates the output clipping due to low battery supply voltage. As a Class-D audio amplifier, the ft2708 features 88% efficiency and 75dB PSRR at 1kHz, which make the device ideal for use in portable electronic devices. Furthermore, the ft2708 incorporates shutdown mode to minimize the power consumption and comprehensive protection features against various operating faults for a safe and reliable operation . FEATURES? Wide supply voltage range from 3.0V to 5.5V? Automatic level control to eliminate output clipping? Output power in ALC Mode 1 1.3W / Ch (VDD = 5.0V, 8Ω load, 0.8% THD + N) 2.4W / Ch (VDD = 5.0V, 4Ω load, 0.8% THD + N)? Output power in ALC Mode 2 1.5W / Ch (VDD = 5.0V, 8Ω load, 4% THD + N) 2.8W / Ch (VDD = 5.0 V, 4Ω load, 4% THD + N)? Maximum Output power 1.8W / Ch (VDD = 5.0V, 8Ω load, 10% THD + N) 3.2W / Ch (VDD = 5.0V, 4Ω load, 10% THD + N) Low THD + N:? 0.06% (typical) @ 1kHz (VDD = 5.0V, RL = 4Ω, PO = 1.5W) Wide ALC dynamic range up to 12dB Voltage gain:?? 24dB High efficiency up to 88? %? Mute function? Volume fade-in / out? Auto-recovering over-current or short-circuit protection? Thermal shutdown? Available in TSSOP-16L & QFN4x4-16L package APPLICATIONS? Smart Phones? Multimedia Internet Devices? Portable