Top

Stereo, High-Power, Class D Amplifier

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

Product Details

Key Features

Parametric specs for Speaker Amplifiers
# Channels 2
Class D
Spkr. Amp. VCC (V) (min) 8
Spkr. Amp. VCC (V) (max) 28
Spkr. Amp. ICC (mA) (typ) 10
POUT into 4Ω @ 1% THD+N (W) (min) 13
POUT into 4Ω @ 10% THD+N (W) (min) 17
POUT into 8Ω @ 1% THD+N (W) (min) 16
Spkr. Amp. Half Pwr. THD+N (%) 0.03
SNR (dB) (A- Weighted) 107
PSRR (dB) (min) 67
Package/Pins TQFN/36
Budgetary
Price (See Notes)
1.56
View Less

Simplified Block Diagram

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 .

Parameters

Parametric specs for Speaker Amplifiers
# Channels 2
Class D
Spkr. Amp. VCC (V) (min) 8
Spkr. Amp. VCC (V) (max) 28
Spkr. Amp. ICC (mA) (typ) 10
POUT into 4Ω @ 1% THD+N (W) (min) 13
POUT into 4Ω @ 10% THD+N (W) (min) 17
POUT into 8Ω @ 1% THD+N (W) (min) 16
Spkr. Amp. Half Pwr. THD+N (%) 0.03
SNR (dB) (A- Weighted) 107
PSRR (dB) (min) 67
Package/Pins TQFN/36
Budgetary
Price (See Notes)
1.56

Key Features

  • 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

Applications/Uses

  • LCD Monitors
  • LCD/PDP Televisions
  • MP3 Docking Stations
  • Notebook PCs

Description

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.

Simplified Block Diagram

MAX98400A, MAX98400B: Simplified Block Diagram MAX98400A, MAX98400B: Simplified Block 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 .