Stereo, High-Power, Class D Amplifier
Differential Input, Power Limiting, Anticlipping, Thermal Foldback, and Excellent EMI Performance
DescriptionThe 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.
- 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
- LCD Monitors
- LCD/PDP Televisions
- MP3 Docking Stations
- Notebook PCs
|Part Number||Class||Spkr. Amp. VCC|
|Spkr. Amp. VCC|
|Spkr. Amp. ICC|
|POUT into 4Ω @ 1% THD+N|
|POUT into 4Ω @ 10% THD+N|
|POUT into 8Ω @ 1% THD+N|
|POUT into 8Ω @ 10% THD+N|
|Spkr. Amp. Half Pwr. THD+N|
|min||max||typ||min||min||min||min||A- Weighted||min||See Notes|
Technical DocumentsTutorial 5633 Pack Your Music and Upcycle That Old Suitcase
Tutorial 5590 Types of Audio Amplifiers
Reference Schematic 5147 Simple Wireless Bluetooth Stereo Audio System for Outdoor Use
|Device||Fab Process||Technology||Sample size||Rejects||FIT at 25°C||FIT at 55°C||Material Composition|
- Wide Input Supply Range (3.0V to 14V)
- Class-DG Operation Enables Industry Leading Quiescent Power
- Ultra-Low Noise Floor
|Tutorial||5633||Pack Your Music and Upcycle That Old Suitcase|
|Tutorial||5590||Types of Audio Amplifiers|
|Reference Schematic||5147||Simple Wireless Bluetooth Stereo Audio System for Outdoor Use|