19-3160; Rev 7; 3/06
10W Stereo/15W Mono, Filterless,
Spread-Spectrum, Class D Amplifiers
Features
The MAX9703/MAX9704 mono/stereo Class D audio
power amplifiers provide Class AB amplifier performance
with Class D efficiency, conserving board space and
eliminating the need for a bulky heatsink. Using a Class
D architecture, these devices deliver up to 15W while
offering up to 78% efficiency. Proprietary and patent-protected modulation and switching schemes render the traditional Class D output filter unnecessary.
The MAX9703/MAX9704 offer two modulation schemes:
a fixed-frequency mode (FFM), and a spread-spectrum
mode (SSM) that reduces EMI-radiated emissions due
to the modulation frequency. The device utilizes a fully
differential architecture, a full bridged output, and comprehensive click-and-pop suppression.
The MAX9703/MAX9704 feature high 80dB PSRR, low
0.07% THD+N, and SNR in excess of 95dB. Short-circuit and thermal-overload protection prevent the
devices from being damaged during a fault condition.
The MAX9703 is available in a 32-pin TQFN (5mm x
5mm x 0.8mm) package. The MAX9704 is available in a
32-pin TQFN (7mm x 7mm x 0.8mm) package. Both
devices are specified over the extended -40°C to
+85°C temperature range.
♦ Filterless Class D Amplifier
♦ Unique Spread-Spectrum Mode Offers 5dB
Emissions Improvement Over Conventional
Methods
♦ Up to 78% Efficient (RL = 8Ω)
♦ Up to 88% Efficient (RL = 16Ω)
♦ 15W Continuous Output Power into 8Ω (MAX9703)
♦ 2x10W Continuous Output Power into 8Ω (MAX9704)
♦ Low 0.07% THD+N
♦ High PSRR (80dB at 1kHz)
♦ 10V to 25V Single-Supply Operation
♦ Differential Inputs Minimize Common-Mode Noise
♦ Pin-Selectable Gain Reduces Component Count
♦ Industry-Leading Click-and-Pop Suppression
♦ Low Quiescent Current (24mA)
♦ Low-Power Shutdown Mode (0.2µA)
♦ Short-Circuit and Thermal-Overload Protection
♦ Available in Thermally Efficient, Space-Saving
Packages
32-Pin TQFN (5mm x 5mm x 0.8mm)–MAX9703
32-Pin TQFN (7mm x 7mm x 0.8mm)–MAX9704
Applications
LCD TVs
Hands-Free Car
Phone Adaptors
Ordering Information
Automotive
Desktop PCs
LCD Projectors
PIN-PACKAGE
AMP
PKG CODE
MAX9703ETJ+
32 TQFN-EP*
Mono
T3255-3
MAX9704ETJ+
LCD Monitors
32 TQFN-EP*
Stereo
T3277-2
PART
Note: All devices specified for over -40°C to +85°C operating
temperature range.
*EP = Exposed paddle.
+Denotes lead-free package.
Block Diagrams
0.47µF
IN+
OUTL+
H-BRIDGE
0.47µF
MAX9703
0.47µF
MAX9704
INL+
INL-
OUTL-
INR+
OUTR+
OUT+
H-BRIDGE
0.47µF
IN-
OUT-
0.47µF
H-BRIDGE
0.47µF
INR-
OUTR-
Pin Configurations appear at end of data sheet.
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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MAX9703/MAX9704
General Description
