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Fangtek - 4W Dual-Pump Class-G Audio Power Amplifier

Numéro de référence ft2820
Description 4W Dual-Pump Class-G Audio Power Amplifier
Fabricant Fangtek 
Logo Fangtek 





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ft2820 fiche technique
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

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