MAX98372

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Digital Input Class D Amplifier with DHT and Brownout Protection

High-Power Digital Class D with Brownout Protection and DHT Requires No Programming

Data Sheet (Rev. 4) Product Selection Table
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Overview

  • Wide Supply Range (5.5V to 18V)
  • Dynamic Headroom Tracking Maintains a Consistent Listening Experience
  • Integrated Thermal Foldback Allows Robust Operation in a WLP Package
  • Remote Output Sensing Allows Up to 20dB THD+N Improvement When Ferrites Are Used
  • Class D Edge Rate Control Enables Filterless Operation
  • 110dB A-Weighted Dynamic Range
  • Output Power at 1% THD+N:
    • 15.7W into 8Ω, VPVDD = 17V
    • 13.2W into 4Ω, VPVDD = 12V
  • Output Power at 10% THD+N
    • 19W into 8Ω, VPVDD = 17V
    • 15.8W into 4Ω, VPVDD = 12V
  • Speaker Amplifier Efficiency
    • 91% at 10W into 8Ω, VPVDD = 12V
    • 81% at 15W into 4Ω, VPVDD = 12V
  • ALC Provides Battery Brownout Protection
  • Extensive Click-and-Pop Suppression
  • 30-Bump, 0.4mm WLP and 32-Pin TQFN Packages

The MAX98372 is a high-efficiency, mono Class D audio amplifier featuring dynamic headroom tracking (DHT) and brownout protection. DHT automatically optimizes the headroom available to the Class D amplifier as the power supply voltage varies, due to sudden transients and declining battery life to maintain a consistent listening experience. A wide 5.5V to 18V supply range allows the device to reach 19W into an 8Ω load.

The MAX98372’s flexible digital audio interface (DAI) supports I2S, left-justified, and TDM formats. The digital audio interface accepts 32kHz, 44.1kHz, 48kHz, 88.2kHz, and 96kHz sample rates with 16-/24-/32-bit data supported for all data formats. In TDM mode, the device can support up to 16 channels of audio data. A unique clocking structure eliminates the need for an external MCLK signal that is typically needed for PCM communication. This reduces pin count and simplifies board layout.

Active emissions limiting with edge rate control minimizes EMI and eliminates the need for output filtering found in traditional Class D devices.

An 8-bit PVDD supply voltage ADC enables the dynamic headroom tracking circuit. DHT optimizes audio program peak behavior as the supply voltage varies and provides flexible user-defined parameters.

Thermal foldback protection ensures robust behavior when the thermal limits of the device are exercised. The circuit can be enabled to automatically reduce the output power above a user specified temperature. This allows for uninterrupted music playback even at high ambient temperatures. Traditional thermal protection is also available in addition to robust overcurrent protection.

All MAX98372 control is performed using a standard 2-wire, I2C interface. One of sixteen slave addresses can be selected through two, four-level address pins. The IC is available in a 0.4mm pitch, 30-bump WLP and 32-pin TQFN packages. It is specified over the extended, -40°C to +85°C temperature range.

For similar function without brownout protection see MAX98371

Applications

  • Notebook Computers
  • Soundbars
  • Tablets
MAX98372
Digital Input Class D Amplifier with DHT and Brownout Protection
MAX98372: Detailed Functional Diagram
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Documentation

Data Sheet 1

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Audio Amplifiers 1
MAX98371
Digital Input Class D Speaker Amplifier with Dynamic Headroom Tracking
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Tools & Simulations

Software Development 2

Evaluation Kits

MAX98372TEVSYS

Evaluation System for the MAX98372 (TQFN)

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Features and Benefits

  • 5.5V to 18V Single-Supply Operation (EV System)
  • USB Audio Streaming (EV System)
  • I2S, Left-Justified, or TDM Input
  • Optional Output Filters
  • Proven PCB Layout
  • Fully Assembled and Tested
  • Windows 7 (or Newer) Compatible Software

Product Details

The MAX98372 Evaluation System (EV system) evaluates the MAX98372 digital input Class D speaker amplifier with dynamic headroom tracking and automatic level control. The EV system comprises the MAX98372 development (DEV) board, Maxim’s audio interface 1 (AUDINT1) board, and the MAX98372 evaluation software.

The MAX98372 DEV board is a fully assembled and tested PCB that contains the necessary circuitry and connections to evaluate the MAX98372 device. It is recommended that the DEV board be evaluated with the AUDINT1 board as an EV system. The MAX98372 requires two supply inputs, 1.14V to 1.98V (DVDD) and 5.5V to 18V (PVDD), and can deliver 19W into an 8Ω load. Additionally, the MAX98372 supports standard I2S, left-justified, and TDM digital audio interfaces.

When evaluated as an EV system, the AUDINT1 board provides the necessary logic rails and USB-to-I2S and USB-to-I2C interfaces needed to evaluate the MAX98372 DEV board with only a single external power supply. The Simplified EV System Block Diagram provides an image of the EV system, highlighting the key areas on each board.

Communication with the DEV board is facilitated by Windows® 7 (or newer) compatible software that provides a simple and intuitive graphical user interface (GUI). The MAX98372 evaluation software is only for use with the MAX98372 EV System.

Applications

  • Notebook Computers
  • Soundbars
  • Tablets

MAX98372EVSYS

Evaluation Kit for the MAX98372

Buy Now View Details

Features and Benefits

  • 5.5V to 18V Single-Supply Operation (EV System)
  • USB Audio Streaming (EV System)
  • I2S, Left-Justified, or TDM Input
  • Optional Output Filters
  • Proven PCB Layout
  • Fully Assembled and Tested
  • Windows 7- and Windows 8-Compatible Software

Product Details

The MAX98372 Evaluation System (EV system) evaluates the MAX98372 digital input Class D speaker amplifier with dynamic headroom tracking and automatic level control. The EV system comprises the MAX98372 development (DEV) board, Maxim’s audio interface 1 (AUDINT1) board, and the MAX98372 evaluation software.

The MAX98372 DEV board is a fully assembled and tested PCB that contains the necessary circuitry and connections to evaluate the MAX98372 device. It is recommended that the DEV board be evaluated with the AUDINT1 board as an EV system. The MAX98372 requires two supply inputs, 1.14V to 1.98V (DVDD) and 5.5V to 18V (PVDD), and can deliver 19W into an 8Ω load. Additionally, the MAX98372 supports standard I2S, left-justified, and TDM digital audio interfaces.

When evaluated as an EV system, the AUDINT1 board provides the necessary logic rails and USB-to-I2S and USB-to-I2C interfaces needed to evaluate the MAX98372 DEV board with only a single external power supply. The Simplified EV System Block Diagram provides an image of the EV system, highlighting the key areas on each board.

Communication with the DEV board is facilitated by Windows® 7- and Windows 8-compatible software that provides a simple and intuitive graphical user interface (GUI). The MAX98372 evaluation software is only for use with the MAX98372 EV System.

Applications

  • Notebook Computers
  • Soundbars
  • Tablets
MAX98372TEVSYS
Evaluation System for the MAX98372 (TQFN)
MAX98372EVSYS
Evaluation Kit for the MAX98372

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