11 V Boosted Mono Class D Amplifier with DSP Speaker Protection and Audio Enhancement

The CS35L41 is the industry’s most advanced smart boosted audio amplifier solution for mobile devices. It features a top-of-the-line boosted Class D amplifier, combined with an integrated DSP and 5th generation enhancement and protection algorithms. A closed-loop digital input Class D amplifier and an 11 V Class H envelope-tracking boost maximize output power and efficiency. The amplifier features the lowest power consumption, lowest noise, and smallest package size of any amplifier in its class. The integrated DSP and enhancement algorithms enrich audio quality without creating an additional workload for the application processor or external DSP. Speaker protection algorithms allow the CS35L41 to safely drive a speaker to the max, achieving the highest output power within the speaker’s thermal and excursion limits. A cutting-edge battery management system adapts to speaker, audio, and battery conditions to protect the battery and mobile system without sacrificing audio volume or quality.

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Audio Amplifiers

Application Categories

Mobile Audio Devices, Smart Home, Speakers


  • 11 V boosted output – 5.3 W @ 1% THD + N, 6.0 W @ 10% THD + N
  • Integrated DSP with audio enhancement and speaker protection algorithms
  • Cutting-edge battery management system protects battery and system while maintaining volume and quality
  • 9 uV idle-channel noise
  • 6.7 mW idle power
  • 5.64 mm²(30-ball WLCSP package)

Parametric Specifications

Description Boosted Class D Smart Amp + DSP
Vout(V)-Max 11
Output Power (W) @1% THD+N, into 8 ohm 5.3
Boost Class H
Channels Mono
Inputs I²S;
Supply (V) 2.5-5.5
Idle Power Consumption (mW) 6.7
Idle Noise (μVrms) 9
Size (mm²) 5.64
Package 30 WLCSP
Pitch (mm) 0.4


Comprehensive Solutions