MAX98400A Datasheet, PDF (1/26 Pages) Maxim Integrated Products – Stereo, High-Power, Class D Amplifiers

19-5286; Rev 0; 6/10
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Stereo, High-Power, Class D Amplifiers
General Description
The MAX98400A/MAX98400B Class D amplifiers provide
high-performance, thermally efficient amplifier solutions. The
MAX98400A delivers 2x20W into 8I loads or 1x40W into a
4I load. The MAX98400B delivers 2x12W into 8I loads.
An integrated limiting circuit prevents output clipping
distortion, protects small speakers from transient volt-
ages, and reduces power dissipation.
A thermal-foldback feature can be enabled to automati-
cally reduce the output power at above a junction tem-
perature of +120NC. 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 mini-
mizes noise coming into and out of shutdown.
The MAX98400A/MAX98400B are available in 36-pin
and 24-pin TQFN packages, respectively, and are speci-
fied over the -40NC to +85NC temperature range.
Features
S Wide 8V to 28V Supply Voltage Range
S Single-Supply Operation
S Low EMI: Active Emissions Limiting
S Clipping Limiter
S Low Quiescent Current
S Thermal Foldback
S Thermal and Overcurrent Protection
LCD/PDP Televisions
LCD Monitors
MP3 Docking Stations
Notebook PCs
Applications
Ordering Information
PART
PIN-PACKAGE
SPEC
MAX98400AETX+
36 TQFN-EP*
2x20W
MAX98400BETG+ 24 TQFN-EP*
2x12W
Note: Devices operate over the -40°C to +85°C temperature
range.
*EP = Exposed pad.
Simplified Block Diagram
INL-
CLIPPING
LIMITER
PGA
INL+
CLASS D
MODULATOR
AND H-BRIDGE
OUTL-
OUTL+
MAX98400A/B
MONO*
INR-
CLIPPING
LIMITER
PGA
INR+
CLASS D
MODULATOR
AND H-BRIDGE
OUTR-
OUTR+
*MAX98400A ONLY
________________________________________________________________ Maxim Integrated Products   1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.