MAX98400A

Stereo, High-Power, Class D Amplifier

Differential Input, Power Limiting, Anticlipping, Thermal Foldback, and Excellent EMI Performance

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Overview

Features and Benefits
Product Details

Features and Benefits

Wide 8V to 28V Supply Voltage Range
Single Supply Operation
Low EMI: Active Emissions Limiting
Clipping Limiter
Low Quiescent Current
Thermal Foldback
Thermal and Overcurrent Protection

Product Details

The MAX98400A/MAX98400B Class D amplifiers provide high-performance, thermally efficient amplifier solutions. The MAX98400A delivers 2x20W into 8Ω loads or 1x40W into a 4Ω load. The MAX98400B delivers 2x12W into 8Ω loads.

An integrated limiting circuit prevents output clipping distortion, protects small speakers from transient voltages, and reduces power dissipation.

A thermal-foldback feature can be enabled to automatically reduce the output power at above a junction temperature of +120°C. Traditional thermal protection is also available in addition to robust overcurrent protection.

The ICs operate from a single 8V to 28V supply and provide a high 67dB PSRR, eliminating the need for a regulated power supply. They offer up to 90% efficiency from a 12V supply.

Filterless modulation allows the ICs to pass EN55022B EMI limits with 1m cables using only a low-cost ferrite bead and small-value capacitor on each output.

Both devices feature eight-digitally-controlled gain settings.

Comprehensive click-and-pop reduction circuitry minimizes noise coming into and out of shutdown.

The MAX98400A/MAX98400B are available in 36-pin and 24-pin TQFN packages, respectively, and are specified over the -40°C to +85°C temperature range.

Applications

LCD Monitors
LCD/PDP Televisions
MP3 Docking Stations
Notebook PCs

Product Categories

Audio Products

Markets and Technologies

Consumer (1)
- Edge Devices

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Product Lifecycle Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (2)

MAX98400AEVKIT

Evaluation Kit for the MAX98400A

MAX98400BEVKIT

Evaluation Kit for the MAX98400B

MAX98400AEVKIT

View Detailed Evaluation Kit Information

The MAX98400A evaluation kit (EV kit) configures the MAX98400A Class D amplifier to drive 2x20W into a pair of 8Ω speakers in stereo mode, or 1x40W into a 4Ω speaker in mono mode, for audio applications. The EV kit operates from an 8V to 28V DC power supply. The EV kit is configured for +20.1dB gain. The EV kit accepts a pair of single-ended or differential input signals and provides two sets of differential outputs for speakers.

The EV kit has two independent MAX98400A circuits, demonstrating direct speaker driving (for low component count) and filtered output driving (for ease of evaluation). The EV kit comes with two MAX98400AETX+ devices installed.

The EV kit provides an option to control the limiter, thermal foldback, input configuration, gain, shutdown, and mono mode of the MAX98400A. The EV kit also provides an input pad to accept an optional external power supply for powering the device's preamplifiers. The EV kit includes convenient audio input and output connectors.

Applications

LCD Monitors
LCD/PDP Televisions
MP3 Docking Stations
Notebook PCs

Features & Benefits

8V to 28V Single DC Power-Supply Operation
Fully Differential Inputs and Outputs
Drives 2x20W into 8Ω Speakers in Stereo Mode
Drives 1x40W into 4Ω Speaker in Mono Mode
Limiter Control
Thermal Foldback
Shutdown Control
Evaluates the MAX98400A in a 36-Pin TQFN Package with an Exposed Pad
U1 Configured for Filterless Output
U2 Configured for Filtered Output
Fully Assembled and Tested

MAX98400BEVKIT

View Detailed Evaluation Kit Information

The MAX98400B evaluation kit (EV kit) configures the MAX98400B Class D amplifier to drive 2x12W into a pair of 8Ω speakers in stereo mode for audio applications. The EV kit operates from an 8V to 28V DC power supply. The EV kit has a programmable gain and the jumper settings default to a +20.1dB gain. The EV kit accepts a pair of single-ended or differential input signals and provides two sets of differential outputs for speakers.

The EV kit has two independent amplifier circuits, demonstrating direct speaker driving (for low component count) and filtered output driving (for ease of evaluation). The EV kit comes with two MAX98400BETG+ devices installed.

The EV kit provides an option to control the limiter, thermal foldback, input configuration, gain, and shutdown mode of the device. The EV kit includes convenient audio input and output connectors.

Applications

LCD Monitors
LCD/PDP Televisions
MP3 Docking Stations
Notebook PCs

Features & Benefits

8V to 28V Single DC Power-Supply Operation
Fully Differential Inputs and Outputs
Drives 2x12W into 8Ω Speakers in Stereo Mode
Limiter Control
Thermal Foldback
Shutdown Control
Evaluates the MAX98400B in a 24-Pin TQFN Package with an Exposed Pad
U1 Configured for Filterless Output
U2 Configured for Filtered Output
Fully Assembled and Tested

Documentation & Resources

Data Sheet

MAX98400A-MAX98400B: Stereo, High-Power, Class D Amplifier Data Sheet (Rev. 3)
11/20/2020
PDF

Reliability Data

MAX98400A Reliability Data
1/12/2023
PDF

Technical Article

Pack Your Music and Upcycle That Old Suitcase
6/13/2013
Types of Audio Amplifiers
5/24/2013

Product Recommendations

MAX98400A Companion Parts

Recommended Related Parts

MAX9736, MAX9744, MAX9737, MAX9768.

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number	Material Declaration	Reliability Data	Pin/Package Drawing	CAD Symbols, Footprints & 3D Models
MAX98400AETX+	Material Declaration	Reliability Data	36-LFCSP-6X6X0.75	Ultra Librarian SamacSys
MAX98400AETX+T	Material Declaration	Reliability Data	36-LFCSP-6X6X0.75	Ultra Librarian SamacSys
Wafer Fabrication Data		MAX98400A Reliability Data

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Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.