ft2820 – 4W Dual-Pump Class-G Audio Power Amplifier

Part Number : ft2820

Function : 4W Dual-Pump Class-G Audio Power Amplifier

Manufactures : Fangtek

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ft2820 image

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Description :

ft2820 4W Dual-PumpTM Class-G Audio Power Amplifier GENERAL DESCRIPTION The ft2820 is a 4W boosted Class-G audio power amplifier based upon a proprietary Dual-PumpTM topology with automatic level control (ALC). It operates from 3V to 5.5V supply. When operating with a 4.2V supply voltage, it is capable of driving a 4Ω speaker load at a continuous average output of 4W with 10% THD+N. Its high efficiency, up to 82%, helps extend battery life for portable device applications. In ft2820, the power supply rail for the amplifier’s output stage is internally boosted and regulated at 6V by an adaptive charge pump based upon the Dual-PumpTM topology, thus 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 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 the maximally-allowed dynamic range of the audio output signals. The ALC also eliminates the output clipping due to low battery supply voltage. FEATURES  Proprietary Dual-PumpTM topology  Filterless Class-G operation with an integrated charge pump  Automatic level control to eliminate output clipping  Integrated lowpass filter for out-of-band noise rejection  Maximum output power: 4W (VDD=4.2V, RL=4Ω, THD+N=10%, ALC Off)  Constant output power: 3.3W (VDD=4.2V, RL=4Ω, THD+N=0.5%, ALC On)  High power 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 APPLICATIONS  Portable Speakers  MID  Mobile Phones APPLICATION CIRCUIT L VDD Cs 10uF C F1 2.2uF C F2 2.2uF Cs 1uF H CVDD CP1 CN1 CP2 CN2 AVDD PVOUT PVDD ft2820 EN PGND Cin 470nF Cin 470nF INP VOP VON INN GND(AGND/CGND) COUT 10uF 100uF SEP, 2013 Figure 1: Typical Application Circuit Diagram www.fangtek.com.cn 1 PIN CONFIGURATION AND DESCRIPTION ft2820 CGND 1 AGND 2 EN 3 CN2 4 CP2 5 CVDD 6 NC 7 INN 8 INP 9 AVDD 10 ft2820P (TOP VIEW) 20 CN1 19 PVOUT 18 CP1 17 PVDD 16 VOP 15 PGND 14 VON 13 PVDD 12 NC 11 NC SYMBOL EN CN2 CP2 CVDD INN INP AVDD PVDD VON PGND VOP CP1 PVOUT CN1 CGND AGND NC PIN NUMBER 3 4 5 6 8 9 10 13, 17 14 15 16 18 19 20 1 2 7, 11, 12 I/O DESCRIPTION I Chip enable & one-wire pulse control. O Flying capacitor CF2 negative terminal. O Flying capacitor CF2 positive terminal. P Power supply for the charge pump. I Negative audio input terminal. I Positive audio input terminal. P Analog power supply. Power supply rail for the […]

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ft2820 Datasheet


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