CS35L41

11 Volt Boosted Class D Audio Amplifier with DSP

Featuring Speaker Protection, Audio Enhancement

and Advanced Battery Management

and SoundClear Playback enhancement

Class H boost and low quiescent power

Intelligently regulate battery current

with predictive battery management

System Features

• Boosted output – 11 V

• High output power – 5.3 W

• Idle channel noise – 9 uV

• Low quiescent power – 6.7 mW

• Integrated DSP

and speaker protection

• Advanced battery management

system

• Supply voltage – 2.5 V to 5.5 V

• Stereo configuration using two

CS35L41 devices

• Space Saving 30-ball WLCSP

0.4 mm pitch

Product Block Diagram

Clocking

11 V Digital Boost

Converter

Class H

Class D Amp

Power

Monitoring

DSP

Enhancement

Speaker Protection

Battery Protection

Serial Audio

Control

ADC

Speaker

Monitoring

ADC

CS35L41

Product Overview

The CS35L41 is the industry’s first 55 nm smart audio amplifier solution

with integrated DSP. This device features a mono 5.3 W boosted Class D

amplifier that provides very loud audio without compromising sound quality,

high efficiency and the lowest noise and quiescent power consumption

of any amplifier in its class. Voltage and current sensing feedback at the

speaker output and battery improves the accuracy of the amplifier and

integrated algorithms. Speaker protection algorithms enable maximum

loudness by allowing the amplifier to safely drive high output power while

ensuring that the speaker’s thermal and excursion limits are not exceeded.

Audio enhancement algorithms provide equalization, compression and

psychoacoustic improvements to fine-tune the speaker to improve clarity,

loudness and frequency response while maintaining the sound quality of

the audio. A cutting-edge battery management system adapts to speaker,

audio and battery conditions to intelligently regulate battery current without

sacrificing loudness or audio quality. The CS35L41 provides this level of

performance within a package smaller than any smart amplifier in its class,

and almost half the size of other leading DSP smart amps.