EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX98374 Digital Input Class D Speaker Amplifier with DHT General Description Benefits and Features The MAX98374 is a high-efficiency, mono Class D Wide Input Supply Range (5.5V to 16V) speaker amplifier featuring dynamic headroom tracking Dynamic Headroom Tracking (DHT) Maintains a (DHT) and brownout protection. As the power-supply volt- Consistent Listening Experience age varies due to sudden transients and declining battery Integrated Thermal Protection and Output Foldback life, DHT automatically optimizes the headroom available Remote Output Sensing Allows up to 20dB THD+N to the Class D amplifier to maintain a consistent listening experience. A wide 5.5V to 16V supply range allows the Improvement with Ferrite Bead Filters device to exceed 16W into an 8 load. Class D EMI Reduction Enables Filterless Operation Active Emissions Limiting (AEL) The flexible digital interface supports either the MIPI Spread-Spectrum Modulation (SSM) SoundWire compatible interface for audio and control Switching Edge Rate Control data, or the PCM interface for audio data and a standard 2 I C interface for control data. The PCM interface supports 110dB A-Weighted Dynamic Range 2 I S, left-justified, and TDM audio data formats at 16-, 32-, 0.006% THD+N at 3W into 8, f = 1kHz 44.1-, 48-, 88.2-, and 96kHz sample rates with 16-, 24-, 0.025% THD+N at 3W into 8, f = 6kHz and 32-bit data. In TDM mode, the device can support up to 16 channels of audio data. A unique clocking structure Output Power at 1% THD+N: eliminates the need for an external master clock for PCM 13.5W into 8, V = 16V PVDD communication, which reduces pin count and simplifies 12.5W into 4, V = 12V PVDD board layout. Output Power at 10% THD+N: Active emissions limiting (AEL), spread spectrum modula- 16.9W into 8, V = 16V PVDD tion (SSM), and edge rate control minimize EMI and elimi- 15.3W into 4, V = 12V PVDD nate the need for the output filtering found in traditional Speaker Amplifier Efficiency: Class D devices. 90.5% at 10W into 8, V = 12V PVDD Thermal foldback protection ensures robust behavior 81% at 15.3W into 4, V = 12V PVDD when the thermal limits of the device are reached. When BDE Provides Supply Brownout Protection enabled, it automatically reduces the output power when Extensive Click-and-Pop Suppression the temperature exceeds a user specified threshold. This allows for uninterrupted music playback even at high Space Saving Packages ambient temperatures. Traditional thermal protection is 25-Bump WLP (2.17mm x 2.25mm x 0.64mm, also available in addition to robust overcurrent protection. 0.4mm Pitch) A flexible brownout-detection engine (BDE) can be 22-Pin FCQFN (3mm x 3mm x 0.55mm, programmed to initiate various gain reductions, signal 0.4mm Pitch) limiting, and clip functions based on supply voltage sta- Applications tus. Threshold, hysteresis, and attack/release rates are Tablets programmable. Notebook Computers The device is available in a 0.4mm pitch, 25-bump wafer- Sound Bars level package (WLP), or in a 0.4mm pitch, 22-pin FCQFN package. The device operates over the extended -40C to Ordering Information appears at end of data sheet. +85C temperature range. MIPI SoundWire is a registered trademark of MIPI Alliance, Inc. 19-100262 Rev 1 1/21MAX98374 Digital Input Class D Speaker Amplifier with DHT Simplified Block Diagram MAX98374 BROWNOUT DYNAMIC THERMAL DETECTION HEADROOM FOLDBACK ENGINE TRACKING 2 I C + PCM INTERFACE OR DAC CLASS D CONTROL SOUNDWIRE AND AUDIO INTERFACE INTERFACES Maxim Integrated 2 www.maximintegrated.com