Datasheet > ft2820P

ft2820P

更新时间： 2025-06-18 01:22:31

品牌	Logo	应用领域
FANGTEK		/
页数	文件大小	规格书
26页	890K
描述
4W Dual-PumpTM Class-G Audio Power Amplifier

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ft2820P 数据手册

ft2820

4W Dual-Pump^TMClass-G Audio Power Amplifier

FEATURES

GENERAL DESCRIPTION



Proprietary Dual-Pump^TMtopology

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^TMtopology. 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.

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)

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^TMtopology, 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.



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



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.

One-wire pulse control to set operating mode and

voltage gain



Auto-recovering short-circuit protection

Available in TSSOP-20L package

APPLICATIONS



Portable Speakers

Tablets

Mobile Phones

Portable Multimedia Devices

APPLICATION CIRCUIT

VDD

C_F22.2uF

_F12.2uF

10uF

CN2

CVDD CP1 CN1 CP2

AVDD

C_OUT

10uF

PVOUT

1uF

100uF

PVDD

PGND

VOP

ft2820

INP

INN

Cin 470nF

VON

GND(AGND/CGND)

Figure 1: Typical Application Circuit Diagram

SEP, 2013

www.fangtek.com.cn

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