EVALUATION KIT AVAILABLE Click here to ask about the production status of specific part numbers. MAX98400A/MAX98400B Stereo, High-Power, Class D Amplifiers General Description Features The MAX98400A/MAX98400B Class D amplifiers provide Wide 8V to 28V Supply Voltage Range high-performance, thermally efficient amplifier solutions. The Single-Supply Operation MAX98400A delivers 2x20W into 8 loads or 1x40W into a Low EMI: Active Emissions Limiting 4 load. The MAX98400B delivers 2x12W into 8 loads. Clipping Limiter An integrated limiting circuit prevents output clipping Low Quiescent Current distortion, protects small speakers from transient voltages, and reduces power dissipation. Thermal Foldback A thermal-foldback feature can be enabled to automatically Thermal and Overcurrent Protection reduce the output power at above a junction temperature of +120C. Traditional thermal protection is also available in Applications addition to robust overcurrent protection. LCD/PDP Televisions The ICs operate from a single 8V to 28V supply and provide LCD Monitors a high 67dB PSRR, eliminating the need for a regulated MP3 Docking Stations power supply. They offer up to 90% efficiency from a 12V Notebook PCs 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. Ordering Information appears at end of data sheet. 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 -40C to +85C temperature range. Simplified Block Diagram INL- OUTL- CLASS D CLIPPING PGA MODULATOR LIMITER AND H-BRIDGE INL+ OUTL+ MONO* MAX98400A/B INR- OUTR- CLASS D CLIPPING PGA MODULATOR LIMITER AND H-BRIDGE INR+ OUTR+ *MAX98400A ONLY 19-5286 Rev 3 10/20MAX98400A/MAX98400B Stereo, High-Power, Class D Amplifiers TABLE OF CONTENTS Absolute Maximum Ratings ...................................................................... 4 Electrical Characteristics ........................................................................ 4 Typical Operating Characteristics ................................................................. 7 Pin Configurations ............................................................................ 12 Pin Descriptions .............................................................................. 12 Stereo Configuration for MAX98400A ............................................................. 14 Mono Configuration for MAX98400A.............................................................. 15 Detailed Description........................................................................... 15 Efficiency 16 Shutdown . 16 Click-and-Pop Suppression . 16 Mono Configuration 16 Clipping Limiter . 16 Limiter Threshold Control (LIM TH) 17 Release Time Control (RELEASE) . 17 Preamplifier Gain Setting . 18 Protection . 18 Thermal Foldback 18 Overtemperature Protection 18 Overcurrent Protection . 18 Applications Information........................................................................ 18 Filterless Class D Operation . 18 Inductor-Based Output Filters 19 Component Selection 19 Input Capacitor . 19 Power Supplies 19 Internal Regulator V S 19 Supply Bypassing, Layout, and Grounding 19 Chip Information.............................................................................. 19 Functional Diagrams .......................................................................... 20 Package Information .......................................................................... 22 Revision History .............................................................................. 26 Maxim Integrated 2 www.maximintegrated.com