19-3108; Rev 1; 10/08
Mono/Stereo High-Power Class D Amplifier
MAX9736
General Description
Features
The MAX9736A/B Class D amplifiers provide high-per-
formance, thermally efficient amplifier solutions. The
MAX9736A delivers 2 x 15W into 8Ω loads, or 1 x 30W
into a 4Ω load. The MAX9736B delivers 2 x 6W into 8Ω
loads or 1 x 12W into a 4Ω load. These devices are pin-
for-pin compatible, allowing a single audio design to
work across a broad range of platforms, simplifying
design efforts, and reducing PCB inventory.
♦ Wide 8V to 28V Supply Voltage Range
♦ Spread-Spectrum Modulation Enables Low EMI
Solution
♦ Passes CE EMI Limits with Low-Cost Ferrite
Bead/Capacitor Filter
♦ Low BOM Cost, Pin-for-Pin Compatible Family
♦ High 67dB PSRR at 1kHz Reduces Supply Cost
♦ 88% Efficiency Eliminates Heatsink
♦ Thermal and Output Current Protection
♦ < 1µA Shutdown Mode
Both 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.
♦ Mute Function
♦ Space-Saving, 7mm x 7mm x 0.8mm, 32-Pin TQFN
Package
Pin-selectable modulation schemes select between fil-
terless 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 mod-
ulation is optimized for best audio performance when
using a full LC filter.
Applications
Notebook PCs
PC Speakers
All-in-One PCs
LCD/PDP/CRT Monitors
LCD/PDP/CRT TVs
MP3 Docking Stations
Ordering Information
A pin-selectable stereo/mono mode allows stereo oper-
ation 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.
STEREO/MONO
PIN-PACKAGE
OUTPUT POWER
PART
15W stereo/
32 TQFN-EP*
30W mono
MAX9736AETJ+
MAX9736BETJ+
Comprehensive click-and-pop reduction circuitry mini-
mizes noise coming into and out of shutdown or mute.
6W stereo/
32 TQFN-EP*
12W mono
Input op amps allow the user to create summing amplifiers,
lowpass or highpass filters, and select an optimal gain.
Note: All devices are specified over the -40°C to +85°C oper-
The MAX9736A/B are available in 32-pin TQFN pack-
ages and specified over the -40°C to +85°C tempera-
ture range.
ating temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Simplified Diagram
8V TO 28V
8Ω
AUDIO
INPUTS
8Ω
INPUT RESISTORS AND
CAPACITORS SELECT GAIN
AND CUTOFF FREQUENCY
SHDN
MUTE
MAX9736
MONO
________________________________________________________________ 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.
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