SGMICRO FT2820P

The ft2820 is a high efficiency 4W Class-G audio power amplifier for use in battery-based portable device applications. It integrates a filterless Class-D audio power amplifier with a Class-G charge pump regulator based upon proprietary Dual-Pump topology. It operates from 3.2V to 4.6V supply. When operating with 4.2V supply voltage, the ft2820 is capable of delivering into 4Ω load with maximum output power of 4W at 10% THD+N in Non-ALC mode, or a constant output power of 3.2W at 0.5% THD+N in ALC mode. Its high efficiency, up to 82%, helps extend battery life. In ft2820, the power supply rail for the audio amplifier’s output stage is internally boosted and regulated at 6V by an adaptive charge pump regulator based upon the Dual-Pump topology, allowing for a much louder audio output than a stand-alone one directly connected to the battery. It makes ft2820 an ideal audio solution for portable devices that are powered by a single-cell lithium battery while requiring higher audio loudness. The ft2820 features automatic level control (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 audio amplifier to eliminate the clipping while maintaining the maximally-allowed dynamic range of the audio output signals.

• Proprietary Dual-PumpTM topology Filterless Class-D audio amplifier integrated with an adaptive Class-G charge pump regulator
• Automatic level control to eliminate output clipping
• Integrated lowpass filter for out-of-band noise rejection
• Maximum output power (Non-ALC Mode) 4.0W (VDD = 4.2V, THD+N = 10%, RL = 4Ω), 3.2W (VDD = 3.6V, THD+N = 10%, RL = 4Ω)
• Constant output power (ALC Mode) 3.2W (VDD = 4.2V, THD+N = 0.5%, RL = 4Ω), 2.8W (VDD = 3.6V, THD+N = 0.5%, RL = 4Ω)
• High efficiency up to 82%
• Low THD + N: 0.05% (VDD = 3.6V, f = 1kHz, RL = 4Ω, Po = 1W)
• ALC dynamic range: 10.5dB
• Low quiescent current: 2.7mA@VDD = 3.6V
• High PSRR: 75dB @ 217Hz
• Two gain settings: 24.1/27.6dB
• One-wire pulse control to set operating mode and voltage gain
• Auto-recovering short-circuit protection
• Available in TSSOP-20L package

• Portable Speakers
• Tablets
• Mobile Phones
• Portable Multimedia Devices