XX-XXXX; Rev 0; 10/05 12W+12W, Filterless, Spread-Spectrum, Stereo, Class D Amplifier The MAX9741 stereo Class D audio power amplifier provides Class AB amplifier performance with Class D efficiency, conserving board space and eliminating the need for a bulky heatsink. Using a Class D architecture, it delivers 12W continuous output power into 8Ω loads. Proprietary and patent-protected modulation and switching schemes render the traditional Class D EMI suppression output filter unnecessary. The MAX9741 offers two modulation schemes: a fixedfrequency 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 offers comprehensive click-and-pop suppression. The MAX9741 features high 80dB PSRR, low 0.07% THD+N, and SNR in excess of 100dB. Short-circuit and thermal-overload protection prevent the device from being damaged during a fault condition. The MAX9741 is available in a 56-pin TQFN (8mm x 8mm x 0.8mm) package. The MAX9741 is specified over the extended -40°C to +85°C temperature range. Applications LCD TVs LCD Monitors Hands-Free Car Phone Adaptors Desktop PCs Automotive Features ♦ Filterless Class D Amplifier ♦ Unique Spread-Spectrum Mode Offers 5dB Emissions Improvement Over Conventional Methods ♦ Up to 88% Efficient into 16Ω ♦ 12W+12W Continuous Output Power into 8Ω ♦ 15W+15W Continous Output Power into 16Ω ♦ 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 56-Pin TQFN (8mm x 8mm x 0.8mm) Package Ordering Information LCD Projectors PART TEMP RANGE PIN-PACKAGE MAX9741ETN+ -40°C to +85°C 56 TQFN-EP* PKG CODE T5688-3 +Denotes lead-free package. *EP = Exposed paddle. Simplified Block Diagram INR+ DIFFERENTIAL AUDIO INPUTS ELIMINATE NOISE PICKUP INR- OUTR+ GAIN CONTROL INL+ INL- G1 CLASS D MODULATOR OUTPUT PROTECTION OUTROUTL+ FILTERLESS CLASS D AMPLIFIERS DRIVE 2 X 13W INTO 8Ω LOADS OUTL- G2 PROGRAMMABLE SWITCHING FREQUENCY FS1, FS2 2 MAX9741 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. 1 MAX9741 General Description