EVALUATION KIT AVAILABLE MAX9708 20W/40W, Filterless, Spread-Spectrum, Mono/Stereo, Class D Amplifier General Description Features The MAX9708 mono/stereo, Class D audio power amplifi- 2 x 21W Output Power in Stereo Mode er delivers up to 2 x 21W into an 8 stereo mode and (8, THD = 10%) 1 x 42W into a 4 load in mono mode while offering up to 1 x 42W Output Power in Mono Mode 87% efficiency. The MAX9708 provides Class AB amplifi- (4, THD = 10%) er performance with the benefits of Class D efficiency, High Efficiency: Up to 87% eliminating the need for a bulky heatsink and conserving Filterless Class D Amplifier power. The MAX9708 operates from a single +10V to +18V supply, driving the load in a BTL configuration. Unique Spread-Spectrum Mode Programmable Gain (+22dB, +25dB, +29.5dB, The MAX9708 offers two modulation schemes: a fixed- +36dB) frequency modulation (FFM) mode, and a spread-spec- trum modulation (SSM) mode that reduces High PSRR (90dB at 1kHz) EMI-radiated emissions. The MAX9708 can be synchro- Differential Inputs Suppress Common-Mode nized to an external clock from 600kHz to 1.2MHz. A Noise synchronized output allows multiple units to be cascad- Shutdown and Mute Control ed in the system. Integrated Click-and-Pop Suppression Features include fully differential inputs, comprehensive Low 0.1% THD+N click-and-pop suppression, and four selectable-gain set- tings (22dB, 25dB, 29.5dB, and 36dB). A pin-program- Current Limit and Thermal Protection mable thermal flag provides seven different thermal Programmable Thermal Flag warning thresholds. Short-circuit and thermal-overload SYNC Input/Output protection prevent the device from being damaged Available in Thermally Efficient, Space-Saving during a fault condition. 56-Pin TQFN Package The MAX9708 is available in a 56-pin TQFN (8mm x 8mm x 0.8mm) package and is specified over the Ordering Information extended -40C to +85C temperature range. PIN- PKG Applications PART TEMP RANGE PACKAGE CODE LCD TVs PDP TVs MAX9708ETN+ -40C to +85C 56 TQFN-EP* T5688-3 Automotive PC/HiFi Audio Solutions MAX9708ETN/V+ -40C to +85C 56 TQFN-EP* T5688-3 +Denotes lead-free package. /V denotes an automotive qualified part. *EP = Exposed pad. Pin Configurations appear at end of data sheet. Simplified Block Diagram MAX9708 MAX9708 2 2 SYNCOUT SYNCOUT FS1, FS2 FS1, FS2 SYNC SYNC RIGHT CHANNEL AUDIO CLASS D CLASS D LEFT INPUT MODULATOR MODULATOR CHANNEL GAIN V DIGITAL GAIN OUTPUT OUTPUT CONTROL CONTROL MONO PROTECTION PROTECTION MONO 2 2 G1, G2 G1, G2 3 3 TH0, TH1, TH0, TH1, TEMP TH2 TH2 TEMP STEREO MODE MONO MODE For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maximintegrated.com. 19-3678 Rev 3 4/13MAX9708 20W/40W, Filterless, Spread-Spectrum, Mono/Stereo, Class D Amplifier ABSOLUTE MAXIMUM RATINGS PV , V to PGND, GND .......................................-0.3 to +30V Continuous Power Dissipation (T = +70C) DD DD A PV to V ..........................................................-0.3V to +0.3V 56-Pin TQFN (derate 47.6mW/C above +70C) ............3.81W DD DD OUTR+, OUTR-, OUTL+, Operating Temperature Range ...........................-40C to +85C OUTL- to PGND, GND...........................-0.3V to (PV + 0.3V) Storage Temperature Range .............................-65C to +150C DD C1N to GND .............................................-0.3V to (PV + 0.3V) Junction Temperature......................................................+150C DD C1P to GND..............................(PV - 0.3V) to (CPV + 0.3V) Thermal Resistance ( ) DD DD JC CPV to GND ..........................................(PV - 0.3V) to +40V 56-Pin TQFN .............................................................0.6C/W DD DD All Other Pins to GND.............................................-0.3V to +12V Lead Temperature (soldering, 10s) .................................+300C Continuous Input Current (except PV , V , OUTR+, DD DD OUTR-, OUTL+, and OUTL-) ...........................................20mA Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (PV = V = +18V, PGND = GND = 0V, C = 0.47F, C = 0.01F, C1 = 0.1F, C2 = 1F, R = , MONO = low (stereo DD DD SS REG LOAD mode), SHDN = MUTE = high, G1 = low, G2 = high (A = 22dB), FS1 = FS2 = high (SSM), SYNCIN = low. All load resistors (R ) are V L connected between OUT + and OUT -, unless otherwise stated. T = T to T , unless otherwise noted. Typical values are at T A MIN MAX A = +25C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage Range V Inferred from PSRR test 10 18 V DD Shutdown Current I SHDN = low 0.1 1 A SHDN Shutdown to Full Operation t 100 ms SON Mute to Full Operation t 100 ms MUTE G1 = 0, G2 = 1 50 85 125 G1 = 1, G2 = 1 40 63 90 Input Impedance R k IN G1 = 1, G2 = 0 25 43 60 G1= 0, G2 = 0 12 21 30 Output Pulldown Resistance SHDN = GND 600 k AC-coupled input, measured between Output Offset Voltage V 30 mV OS OUT + and OUT - PV = 10V to 18V 68 90 DD Power-Supply Rejection Ratio PSRR dB f = 1kHz 90 200mV ripple RIPPLE P-P (Note 2) f = 20kHz 50 RIPPLE DC, input referred 50 70 Common-Mode Rejection Ratio CMRR dB f = 20Hz to 20kHz, input referred 70 Switch On-Resistance R One power switch 0.3 0.75 DS FS1 FS2 0 0 180 200 220 Switching Frequency f 1 1 (SSM) 200 kHz SW 1 0 160 0 1 250 Oscillator Spread Bandwidth FS1 = FS2 = high (SSM) 2 % SYNCIN Lock Range Equal to f x 4 600 1200 kHz SW 2 Maxim Integrated