CAD DIAGRAM
CS35L57-CWR
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CS35L57 Overview
The Cirrus Logic CS35L57 is an integrated smart amplifier solution combining a high-performance mono Class D audio amplifier, Class H tracking inductive boost converter, and Halo Core™ DSP. Designed for portable and battery-powered audio products, it delivers up to 14 W into a 4 Ω speaker at 1% THD+N and supports supply voltages up to 18.5 V. The integrated boost converter generates up to 15 V from 2S, 3S, and 4S battery supplies, maximizing speaker output, power efficiency, and listening consistency while reducing size and reliance on external components. The integrated DSP provides customizable speaker protection, thermal and excursion management, audio enhancement, and power management.
SoundWire v1.2 with SDCA support, along with I²S, I²C, and SPI interfaces, simplifies integration across modern and legacy audio architectures. Additional features include boot-beep, ultrasonic output, and AEC reference-signal aggregation.
The CS35L57 is available in a compact 31-ball CSP package for commercial-grade operation from −40° to +85 °C.
CIRRUS®
CIRRUS ROCKS®
ENGINEERED TO ROCK®
INNOVATION THAT ROCKS®
Product Features
Multi-cell battery boost: up to 15 V output from 2S, 3S, or 4S batteries, for maximum speaker output and consistent performance across battery conditions
Up to 18.5 V amplifier supply: Class D amplifier can be powered externally (boost converter disabled)
130 MCPS Halo Core™ DSP: on-chip speaker protection and audio enhancement algorithms
Speaker current and voltage sensing: on-chip speaker excursion and thermal protection
SoundWire support: SDCA and SoundWire v1.2 conformant
Legacy interfaces: I²S, I²C and SPI ports
Streamlined system integration: simple AEC reference, boot beep, ultrasonic output, digital I/O, and power-sequencing implementations
Parametric Specifications
| Output Configuration | Mono |
| Control Interface | SoundWire, SPI, I²C |
| Digital Audio Interface | SoundWire; I²S; TDM |
| Power Supply (V) | 3-18.5 |
| Boost | Class H |
| Output Power (W) | 14 |
| Vout(V)-Max | 12 |
| DSP Included | Yes |
| Target Market | PC |
| Package | 31 CSP |
Design Resources
Product Abstract
CS35L57 Product Abstract
PA1030R1 | 1 MBAugust 2026
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