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MAX9736
Mono/Stereo High-Power Class D Amplifier
General Description
Features
● Independently Controlled Dual Paths
● Wide 8V to 28V Supply Voltage Range
The MAX9736A/B/D Class D amplifiers provide high-
performance, thermally efficient amplifier solutions. The
MAX9736A delivers 2 x 15W into 8Ω loads, or 1 x 30W
into a 4Ω load. The MAX9736B/D deliver 2 x 6W into 8Ω
loads or 1 x 12W into a 4Ω load.
● Spread-Spectrum Modulation Enables Low EMI
Solution
● Passes CE EMI Limits with Low-Cost Ferrite
Bead/Capacitor Filter
● Low BOM Cost
● High 67dB PSRR at 1kHz Reduces Supply Cost
● 88% Efficiency Eliminates Heatsink
● Thermal and Output Current Protection
● < 1μA Shutdown Mode
These devices operate from 8V to 28V and provide a high
PSRR, eliminating the need for a regulated power supply.
The MAX9736 offers up to 88% efficiency at 12V supply.
Pin-selectable modulation schemes select between filter-
less modulation and classic PWM modulation. Filterless
modulation allows the MAX9736 to pass CE EMI limits
with 1m cables using only a low-cost ferrite bead and
capacitor on each output. Classic PWM modulation is
optimized for best audio performance when using a full
LC filter.
● Mute Function
● Space-Saving, 32-Pin TQFN Packages, 7mm x 7mm
x 0.8mm (MAX9736A/B), 5mm x 5mm x 0.8mm
(MAX9736D)
A pin-selectable stereo/mono mode allows stereo opera-
tion into 8Ω loads or mono operation into 4Ω loads. In
mono mode, the right input op amp becomes available as
a spare device, allowing flexibility in system design.
Applications
● LCD/PDP/CRT Monitors
● LCD/PDP/CRT TVs
● MP3 Docking Stations
● Notebook PCs
Comprehensive click-and-pop reduction circuitry mini-
mizes noise coming into and out of shutdown or mute.
● PC Speakers
Input op amps allow the user to create summing amplifiers,
lowpass or highpass filters, and select an optimal gain.
● All-in-One PCs
The MAX9736A/B/D are available in 32-pin TQFN packages
and specified over the -40°C to +85°C temperature range.
Ordering Information appears at end of data sheet.
Simplified Diagram
8V TO 28V
8Ω
AUDIO
INPUTS
8Ω
SHDN
MUTE
MAX9736
INPUT RESISTORS AND
CAPACITORS SELECT GAIN
AND CUTOFF FREQUENCY
MONO
19-3108; Rev 4; 11/19