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6.1V Mini Smart PA


FS1818U is a smart PA chip integrated with FourSemi SDG, which is speaker excursion and temperature protection algorithm, FS Sound audio algorithm and I/V sense function. It has low power consumption and mini size, and applies to mobile phones, tablets, smart watches, etc.


● High fidelity 24-bits DAC

-104dB SNR

-16µV output noise 

● High efficiency adaptive boost

-Maximum boost up to 6.1V

-Support adaptive mode for optimized power consumption

● High efficiency Class-D

-Integrated high efficiency Class-D amplifier

-Up to 2.05W RMS output power with 8Ω load

-90% at 0.5W in 8Ω with 4.0V VBAT

-81% at 2W in 8Ω with 4.0V VBAT

● I/V sense protection

-Adaptive speaker membrane displacement control

-Adaptive speaker voice coil temperature control

● Built-in audio processor

-10-Bands parametric equalizer

-Programmable compressor & limiter

-Stereo configuration integrated for RAS

-FS Sound integrated

● Digital I2S I/O

-I2S I/O-8KHz-48kHz sample rates

● I2C control port maximum speed up to 1MHz

Package Size

6.1V Mini Smart PA
Part NumberPackageSize(mm)
FS1818UWLCSP-201.58 x 1.98

Block Diagram