MAX98400A：Stereo, High-Power, Class D Amplifier
Differential Input, Power Limiting, Anticlipping, Thermal Foldback, and Excellent EMI Performance
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.
Key Features
| MAX98400A, MAX98400B: Simplified Block Diagram Applications/Uses
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DataSheet
| title | Download file |
|---|---|
| MAX98400A-MAX98400B Data Sheet | MAX98400A-MAX98400B.pdf |
Parametrics
| Part Number | Class | Spkr. Amp. VCC (V) | Spkr. Amp. VCC (V) | Spkr. Amp. ICC (mA) | POUT into 4Ω @ 1% THD+N (W) | POUT into 4Ω @ 10% THD+N (W) | POUT into 8Ω @ 1% THD+N (W) | POUT into 8Ω @ 10% THD+N (W) | Spkr. Amp. Half Pwr. THD+N (%) | SNR (dB) | PSRR (dB) | Package/Pins | Budgetary Price |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | typ | min | min | min | min | A- Weighted | min | See Notes | ||||
| MAX98400A | D | 8 | 28 | 10 | 13 | 17 | 16 | - | 0.03 | 107 | 67 | TQFN/36 | $1.28 @1k |
| MAX98400B | - | - | 13.5 | 15 | 101 | TQFN/24 | $1.02 @1k | ||||||
Design kits & evaluation modules
Quality and Environmental Data
Related Products
- MAX9737：Mono 7W Class D Amplifier
- MAX9744：20W Stereo Class D Speaker Amplifier with Volume Control
- MAX9736：Mono/Stereo High-Power Class D Amplifier
- MAX9768：10W Mono Class D Speaker Amplifier with Volume Control
Ordering Information
| Part Number | Status | Recommended Replacement | Package | Temp | RoHS |
|---|---|---|---|---|---|
| MAX98400AETX+ | Active | TQFN,;36 pin;37.2 mm² | -40°C to +85°C | Lead Free | |
| MAX98400AETX+T | Active | TQFN,;36 pin;37.2 mm² | -40°C to +85°C | Lead Free |
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