GENERAL DESCRIPTION
The ft2830 is a highly efficient 4.5W Class-G audio
power amplifier with automatic level control (ALC) for
use in battery-powered portable devices. It integrates a
filterless Class-D audio power amplifier with a Class-G
charge pump regulator based upon proprietary
Dual-PumpTM topology. It operates from 3.2V to 4.6V
supply. When operating with a 4.2V supply voltage, the
ft2830 can deliver into a 4Ω load a maximum output
power up to 4.5W with 10% THD+N, or a constant
output power at 3.5W with 0.5% THD+N. Its high
efficiency, up to 83%, helps extend battery life.
In ft2830, the power supply rail for the amplifier’s output
stage is internally boosted and regulated at 6.2V by an
adaptive charge pump regulator based upon the
Dual-PumpTM topology, allowing for a much louder
audio output than a stand-alone one directly connected
to the battery. It makes ft2830 an ideal audio solution
for portable devices that are powered by a single-cell
lithium battery while requiring higher audio loudness.
For applications where minimum EMI emission is
required, the charge pump regulator can be disabled.
The ft2830 features ALC to constantly monitor and
safeguard the audio outputs against the boosted supply
voltage, preventing output clipping distortion, excessive
power dissipation, or hazardous speaker over-load.
Once an over-level condition is detected, the ALC
lowers the voltage gain of the audio amplifier
proportionally to eliminate output clipping distortion
while maintaining a maximum dynamic range of the
audio outputs allowed by the boosted supply voltage.
FEATURES
Proprietary Dual-PumpTM topology
Filterless Class-D audio amplifier integrated with a
Class-G charge pump regulator
Automatic level control to eliminate output clipping
Maximum output power (Non-ALC Mode)
4.5W (VDD=4.2V, THD+N=10%, RL=4Ω)
3.6W (VDD=3.6V, THD+N=10%, RL=4Ω) Constant output power (ALC Mode)
3.5W (VDD=4.2V, THD+N=0.5%, RL=4Ω)
3.1W (VDD=3.6V, THD+N=0.5%, RL=4Ω) High efficiency up to 83% Low THD+N: 0.05%
(VDD=3.6V, f=1kHz, RL=4Ω, Po=1W)
ALC dynamic range: 10dB
Low quiescent current: 2.6mA @ VDD=3.6V
High PSRR: 70dB at 1kHz
Two gain settings: 24dB and 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 Multimedia Internet Devices
Mobile Phones
Portable Consumer Electronic Devices 2232442533
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