MAX9715 19-3589 Rev 2 7/08 2.8W, Low-EMI, Stereo, Filterless Class D Audio Amplifier General Description Features The MAX9715 high-efficiency, stereo, Class D audio 5V Single-Supply Operation power amplifier provides up to 2.8W per channel into a Spread-Spectrum Modulator Reduces EMI 4 speaker with a 5V supply. Maxims second-generation Class D technology features robust output protection, 2.8W, Class D, Stereo Speaker Amplifier (4) high efficiency, and high power-supply rejection (PSRR) Filterless Class D Requires No LC Output Filter while eliminating the need for output filters. Selectable gain settings, +10.5dB or +9.0dB, adjust the amplifier High PSRR (71dB at 1kHz) gain to suit the audio input level and speaker load. 86% Efficiency (R = 8, P = 1W) L OUT The MAX9715 features high PSRR (71dB at 1kHz), allowing for operation from noisy supplies without addi- Low-Power Shutdown Mode tional regulation. Comprehensive click-and-pop sup- Integrated Click-and-Pop Suppression pression eliminates audible clicks and pops at startup and shutdown. The MAX9715 operates from a single 5V Low Total Harmonic Distortion: 0.06% at 1kHz supply and consumes only 12mA of supply current. Short-Circuit and Thermal Protection Integrated shutdown control reduces supply current to less than 100nA. Internal Gain, +9.0dB or +10.5dB The MAX9715 is fully specified over the extended Available in Space-Saving Package -40C to +85C temperature range and is available in a 16-Pin Thin QFN-EP (5mm x 5mm x 0.8mm) thermally enhanced 16-pin TQFN-EP package. Applications Ordering Information High-End Notebook Audio PART TEMP RANGE PIN-PACKAGE LCD Projectors MAX9715ETE+ -40C to +85C 16 TQFN-EP* Portable Audio +Denotes a lead-free/RoHS-compliant package. *EP = Exposed pad. Multimedia Docking Stations Typical Operating Circuit/Functional Diagram appears at end of data sheet. Pin Configurations Block Diagram TOP VIEW 4.5V TO 5.5V SUPPLY 12 11 10 9 BIAS 13 8 SHDN OUTR+ INR V OUTR- DD 14 7 GND MAX9715 GAIN CLASS D INR 15 GAIN 6 AMPLIFIER OUTL+ INL INL 16 5 N.C. OUTL- + 12 34 MAX9715 TQFN 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. EVALUATION KIT AVAILABLE PGND PGND OUTL+ OUTR+ OUTL- OUTR- PV PV DD DD2.8W, Low-EMI, Stereo, Filterless Class D Audio Amplifier ABSOLUTE MAXIMUM RATINGS V , PV , to GND ...............................................................+6V Continuous Power Dissipation (T = +70C) DD DD A GND to PGND .......................................................-0.3V to +0.3V 16-Pin TQFN-EP (derate 20.8mW/C above +70C)..1666mW Any Other Pin to PGND ............................. -0.3V to (V + 0.3V) Operating Temperature Range ...........................-40C to +85C DD Duration of OUT Short Circuit to PGND or PV ....Continuous Storage Temperature Range .............................-65C to +150C DD Duration of OUT + Short Circuit between OUT - ......Continuous Junction Temperature......................................................+150C Continuous Current Into/Out of (PV , OUT , PGND)........1.7A Lead Temperature (soldering, 10s) .................................+300C DD Continuous Input Current (All Other Pins) ....................... 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 (V = PV = 5.0V, GND = PGND = 0V, V = V , C = 1F, speaker impedance = 8 in series with 68H connected between DD DD SHDN DD BIAS OUT + and OUT -, GAIN = +10.5dB, T = T to T , unless otherwise noted. Typical values are at T = +25C.) (Notes 1, 2) A MIN MAX A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS GENERAL Supply Voltage Range V Inferred from PSRR test 4.5 5.5 V DD Quiescent Current I No load 12.8 16 mA DD Shutdown Supply Current I V = 0V 0.1 2 A SHDN SHDN Input Resistance R 6.5 10 13.5 k IN Turn-On Time t 25 ms ON BIAS Voltage V 1.8 V BIAS CLASS D SPEAKER AMPLIFIERS T = +25C 12.6 45 A Output Offset Voltage V mV OS T = T to T 70 A MIN MAX GAIN = 0 10.5 Maximum Speaker Amplifier Gain A dB V (Note 3) GAIN = 1 9.0 PV or V = 4.5V to DD DD 52.4 75 5.5V Power-Supply Rejection Ratio PSRR V = 0V dB IN f = 1kHz, 100mV 71 P-P f = 20kHz, 100mV 60 P-P R = 8 1.4 L THD+N = 1% R = 4 2.3 L Output Power P W OUT R = 8 1.7 L THD+N = 10% R = 4 2.8 L R = 8, P = 1.2W 0.06 Total Harmonic Distortion Plus L OUT THD+N f = 1kHz % Noise R = 4, P = 2W 0.07 L OUT P = 1W, BW = 22Hz to 22kHz 89 OUT Signal-to-Noise Ratio SNR dB P = 1W, A-weighted 93 OUT Maximum Capacitive Load C 200 pF L MAX Average frequency in spread-spectrum Switching Frequency f 1.00 1.22 1.40 MHz SW operation 2 MAX9715