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Boosted Class-D Amplifier with Integrated Dynamic Speaker Management

Unleash the Potential of Your Microspeakers—2.5x the Loudness and Deeper Bass with Industry Leading Power Consumption

Product Details

The MAX98390 is a high-efficiency mono Class-D DSM smart amplifier that features an integrated boost converter, integrated Dynamic Speaker Management, and FET scaling for higher-efficiency at low output power.

The maximum boost converter output voltage is programmable from 6.5V to 10V in 0.125V increments from a battery voltage as low as 2.65V. The boost converter supports bypass mode for lower quiescent current and improved mid-power efficiency as well as envelope tracking which automatically adjusts the output voltage for maximum efficiency. The boosted supply efficiently delivers up to 6.2W at 10% THD+N into a 4Ω load.

Integrated IV sense and Dynamic Speaker Management allows louder, fuller audio while protecting the speaker against damage and improving sound quality.

The PCM interface supports I2S, left-justified, and 16-channel TDM formats as a slave or master device with I2C control. Either BCLK or MCLK can be used as the internal clock source providing system level flexibility.

Thermal and other status data can also be read from the I2C interface.

Patented active emissions limiting edge rate and overshoot control circuitry minimizes EMI and eliminates the need for output filtering found in traditional Class-D devices.

A flexible brownout-detection engine (BDE) can be programmed to initiate various current limiting, signal limiting, and clip functions to prevent dips in battery voltage. Threshold, hysteresis, and attack-and-release rates are programmable.

The MAX98390C is available in a 0.4mm pitch, 36-bump wafer-level package. The MAX98390D is available in a 0.5mm pitch, 30-bump wafer-level package. They are specified over the extended -40°C to +85°C temperature range.

Design Solution: Unleash the Full Potential of Your Micro Speakers ›

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Key Features

  • Integrated Speaker Current and Voltage Sense Requires no External Components
  • Integrated Programmable 10V Boost Converter
    • Bypass Mode
    • Envelope Tracking
  • Integrated Dynamic Speaker Management
    • Thermal Protection
    • Excursion Protection
    • Low-Frequency Extension
    • 8-Band Parametric Equalizer
    • Dynamic Range Compression
    • Perceptual Power Reduction
    • Debuzzer
    • Stereo Bass Management
  • Ultra-Low Noise Floor
    • 10µV Output Noise
    • 116dB Dynamic Range
  • Low Distortion—0.01% THD+N
  • Output Power at 1% THD+N, VVBAT = 4.3V
    • 5.1W into 8Ω
    • 5.1W into 4Ω
  • Output Power at 10% THD+N, VVBAT = 4.3V
    • 6.2W into 8Ω
    • 6.2W into 4Ω
  • System Efficiency
    • 82% at 1.2W into 8Ω, VVBAT = 3.7V
    • 86% at 0.45W into 8Ω, VVBAT = 3.7V
  • Dynamic Speaker Output FET Scaling
  • 2.65V to 5.5V Battery Voltage Range
  • I2S/16-Channel TDM and I2C Interfaces
  • Class-D Edge Rate Control Enables Filterless Operation
  • Advanced Brownout-Protection Engine
  • Extensive Click-and-Pop Suppression
  • Robust Short-Circuit and Thermal Protection
  • Space-Saving, 30-Bump WLP Package (2.468mm x 2.968mm, 0.5mm Pitch) or 36-Bump WLP Package (2.418mm x 2.608mm, 0.4mm Pitch)

Applications/Uses

  • Smartphones
  • Tablets
  • Notebook Computers
  • Single Li-ion Cell Devices
  • IoT Devices
  • Toys
Parametric specs for Speaker Amplifiers
# Channels 1
Class Boosted/D
Boosted/G
D
DG
Spkr. Amp. VCC (V) (min) 2.6
Spkr. Amp. VCC (V) (max) 5.5
Spkr. Amp. ICC (mA) (typ) 2.5
POUT into 4Ω @ 1% THD+N (W) (min) 4.9
POUT into 4Ω @ 10% THD+N (W) (min) 6.1
POUT into 8Ω @ 1% THD+N (W) (min) 5.1
POUT into 8Ω @ 10% THD+N (W) (min) 6.1
Spkr. Amp. Half Pwr. THD+N (%) 0.01
SNR (dB) (A- Weighted) 117
PSRR (dB) (min) 113
Package/Pins WLP/30
WLP/36
Budgetary
Price (See Notes)
$1.95 @1k
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Simplified Block Diagram

MAX98390: Functional Diagram MAX98390: Functional Diagram Zoom icon

Technical Docs

Design & Development

Click any title below to view the detail page where available.

Description

For stereo evaluation and design use a MAX98390EVSYS# board with a MAX98390-ST-AUX# stereo expansion board.

The MAX98390C/D evaluation system (EV system) eval- uates the MAX98390C or the MAX98390D boosted Class D audio amplifier with integrated Dynamic Speaker ManagementTM (DSM) IC. DSM senses the voltage and current at the load and uses patented Maxim algorithms to unlock the full potential of the speaker. The EV sys- tem comprises the MAX98390C or the MAX98390D Development Board (DEV board), Maxim’s Audio Interface Board III (AUDINT3), 5V power supply, reference micro- speaker, USB cable, DSM Sound Studio software, and MAX98390 evaluation software.

It is recommended that the DEV board be evaluated with the AUDINT3 board as an EV system. MAX98390C/D supports standard I2S, left-justified, and TDM digital audio interfaces, as well as I2C for control.

The AUDINT3 board provides 1.8V DVDD, USB-to-PCM, and USB-to-I2C interfaces that are needed to evaluate the DEV board, requiring only a single external power supply for VBAT. The Simplified EV System Block Diagram details the DEV board and the AUDINT3 board.

The easy-to-use DSM Sound Studio software has a simple, yet powerful graphical user interface (GUI) that breaks down the DSM design process into three basic steps: extract, tune, and evaluate. Additionally, DSM Sound Studio provides for a 7 minute quick demo to hear the DSM difference using the included reference microspeaker.

There is also the MAX98390 evaluation software that provides complete access to all hardware registers.

View Details

Features

  • Complete Hardware System with Easy Setup, No Tools or Special Equipment Required
  • Precharacterized Reference Microspeaker Included
  • Easy-to-Use Graphical User Interfaces Software (Windows® 7/10 Compatible)
  • DSM Sound Studio
    • Quick Demo Using Included Speaker
    • Extract: Speaker Parameter Extraction
    • Tune: Full Acoustic Tuning Suite
    • Evaluate: Compare Different Tunings
  • MAX98390 Evaluation Software
    • Complete Access to All Hardware Registers

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Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal.

Parameters

Parametric specs for Speaker Amplifiers
# Channels 1
Class Boosted/D
Boosted/G
D
DG
Spkr. Amp. VCC (V) (min) 2.6
Spkr. Amp. VCC (V) (max) 5.5
Spkr. Amp. ICC (mA) (typ) 2.5
POUT into 4Ω @ 1% THD+N (W) (min) 4.9
POUT into 4Ω @ 10% THD+N (W) (min) 6.1
POUT into 8Ω @ 1% THD+N (W) (min) 5.1
POUT into 8Ω @ 10% THD+N (W) (min) 6.1
Spkr. Amp. Half Pwr. THD+N (%) 0.01
SNR (dB) (A- Weighted) 117
PSRR (dB) (min) 113
Package/Pins WLP/30
WLP/36
Budgetary
Price (See Notes)
$1.95 @1k

Key Features

  • Integrated Speaker Current and Voltage Sense Requires no External Components
  • Integrated Programmable 10V Boost Converter
    • Bypass Mode
    • Envelope Tracking
  • Integrated Dynamic Speaker Management
    • Thermal Protection
    • Excursion Protection
    • Low-Frequency Extension
    • 8-Band Parametric Equalizer
    • Dynamic Range Compression
    • Perceptual Power Reduction
    • Debuzzer
    • Stereo Bass Management
  • Ultra-Low Noise Floor
    • 10µV Output Noise
    • 116dB Dynamic Range
  • Low Distortion—0.01% THD+N
  • Output Power at 1% THD+N, VVBAT = 4.3V
    • 5.1W into 8Ω
    • 5.1W into 4Ω
  • Output Power at 10% THD+N, VVBAT = 4.3V
    • 6.2W into 8Ω
    • 6.2W into 4Ω
  • System Efficiency
    • 82% at 1.2W into 8Ω, VVBAT = 3.7V
    • 86% at 0.45W into 8Ω, VVBAT = 3.7V
  • Dynamic Speaker Output FET Scaling
  • 2.65V to 5.5V Battery Voltage Range
  • I2S/16-Channel TDM and I2C Interfaces
  • Class-D Edge Rate Control Enables Filterless Operation
  • Advanced Brownout-Protection Engine
  • Extensive Click-and-Pop Suppression
  • Robust Short-Circuit and Thermal Protection
  • Space-Saving, 30-Bump WLP Package (2.468mm x 2.968mm, 0.5mm Pitch) or 36-Bump WLP Package (2.418mm x 2.608mm, 0.4mm Pitch)

Applications/Uses

  • Smartphones
  • Tablets
  • Notebook Computers
  • Single Li-ion Cell Devices
  • IoT Devices
  • Toys

Description

The MAX98390 is a high-efficiency mono Class-D DSM smart amplifier that features an integrated boost converter, integrated Dynamic Speaker Management, and FET scaling for higher-efficiency at low output power.

The maximum boost converter output voltage is programmable from 6.5V to 10V in 0.125V increments from a battery voltage as low as 2.65V. The boost converter supports bypass mode for lower quiescent current and improved mid-power efficiency as well as envelope tracking which automatically adjusts the output voltage for maximum efficiency. The boosted supply efficiently delivers up to 6.2W at 10% THD+N into a 4Ω load.

Integrated IV sense and Dynamic Speaker Management allows louder, fuller audio while protecting the speaker against damage and improving sound quality.

The PCM interface supports I2S, left-justified, and 16-channel TDM formats as a slave or master device with I2C control. Either BCLK or MCLK can be used as the internal clock source providing system level flexibility.

Thermal and other status data can also be read from the I2C interface.

Patented active emissions limiting edge rate and overshoot control circuitry minimizes EMI and eliminates the need for output filtering found in traditional Class-D devices.

A flexible brownout-detection engine (BDE) can be programmed to initiate various current limiting, signal limiting, and clip functions to prevent dips in battery voltage. Threshold, hysteresis, and attack-and-release rates are programmable.

The MAX98390C is available in a 0.4mm pitch, 36-bump wafer-level package. The MAX98390D is available in a 0.5mm pitch, 30-bump wafer-level package. They are specified over the extended -40°C to +85°C temperature range.

Design Solution: Unleash the Full Potential of Your Micro Speakers ›

Mobile App

Simplified Block Diagram

MAX98390: Functional Diagram MAX98390: Functional Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal.