MAX9737 19-4327 Rev 0 10/08 Mono 7W Class D Amplifier General Description Features The MAX9737 mono 7W Class D amplifier provides a 8V to 28V Supply Voltage Range high-performance, thermally efficient amplifier solution Spread-Spectrum Modulation Enables Low-EMI that offers up to 88% efficiency at a 12V supply. The Solution device operates from 8V to 28V and provides a high 80dB PSRR, eliminating the need for a regulated power supply. Passes EMI Limit with Up to 1m of Speaker Cable Filterless modulation allows the MAX9737 to pass CE High 80dB PSRR EMI limits with 1m cables using only a low-cost ferrite bead and small-value capacitor on each output. Up to 88% Efficiency Eliminates Heatsink Comprehensive click-and-pop suppression circuitry Thermal and Output Current Protection reduces noise on power-up/down or into and out of < 1A Shutdown Mode shutdown or mute. An input op amp allows the user to create a lowpass or Click-and-Pop Suppression highpass filter, and select an optimal gain. The internal < 10ms Turn-On Time precharge circuit ensures clickless/popless turn-on Space-Saving, 4mm x 4mm x 0.8mm, 24-Pin TQFN within 10ms. Package The MAX9737 is available in the 24-pin, TQFN-EP pack- age and is specified over the -40C to +85C tempera- ture range. Applications Ordering Information 2.1 Notebook PCs PART TEMP RANGE PIN-PACKAGE LCD/PDP/CRT Monitors MAX9737ETG+ -40C to +85C 24 TQFN-EP* PC Surround Speakers +Denotes a lead-free/RoHS-compliant package. *EP = Exposed pad. MP3 Docking Stations Simplified Diagram 8V TO 28V PRECHARGE AUDIO INPUT 8 MAX9737 SHDN MUTE INPUT RESISTORS AND CAPACITORS SELECT GAIN AND CUTOFF FREQUENCY Pin Configuration and Typical Application Circuit appear at end of data sheet. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLEMono 7W Class D Amplifier ABSOLUTE MAXIMUM RATINGS PVDD to PGND.......................................................-0.3V to +30V Continuous Power Dissipation AGND to PGND.....................................................-0.3V to +0.3V 24-Pin TQFN Multiple-Layer PCB IN, PRE, PC, COM to AGND.....................-0.3V to (V + 0.3V) (derate 27.8mW/C above +70C)........................2222.2mW REG MUTE, SHDN to AGND ............................................-0.3V to +6V ................................................................................36C/W JA REG to AGND ...............................................-0.3V to (V + 0.3V) ..................................................................................3C/W S JC V to AGND ..............................................................-0.3V to +6V Operating Temperature Range ...........................-40C to +85C S OUT+, OUT- to PGND .............................-0.3V to (PVDD + 0.3V) Storage Temperature Range .............................-65C to +150C C1N to PGND ..........................................-0.3V to (PVDD + 0.3V) Junction Temperature......................................................+150C C1P to PGND .........................(PVDD - 0.3V) to (V + 0.3V) Lead Temperature (soldering, 10s) .................................+300C CHOLD CHOLD to PGND .......................................(V - 0.3V) to +36V C1P OUT+, OUT-, Short Circuit to PGND or PVDD ...........Continuous Thermal Limits (Notes 1, 2) Continuous Power Dissipation (T = +70C) A 24-Pin TQFN Single-Layer PCB (derate 20.8mW/C above +70C)........................................................1666.7mW ................................................................................48C/W JA ..................................................................................3C/W JC Note 1: Thermal performance of this device is highly dependent on PCB layout. See the Applications Information section for more detail. Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. 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 = 12V, V = V = 0, V = V = 5V, C1 = 0.1F, C = 0.47F, C2 = C = C = 1F, R = R = 20k, PVDD AGND PGND SHDN MUTE IN COM REG IN FB R = , AC measurement bandwidth 22Hz to 22kHz, T = T to T , unless otherwise noted. Typical values are at T = +25C.) L A MIN MAX A (Note 3) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS AMPLIFIER DC CHARACTERISTICS Speaker-Supply Voltage Range PVDD Inferred from PSRR test 8 28 V Undervoltage Lockout UVLO 6.8 V T = +25C 15 20 A Quiescent Supply Current I mA PVDD 25 Shutdown Supply Current I V = 0, T = +25C 1 10 A SHDN SHDN A REG Voltage V 4.0 4.2 4.5 V REG Preregulator Voltage V 4.85 V S COM Voltage V 1.94 2.06 2.16 V COM INPUT AMPLIFIER CHARACTERISTICS Capacitive Drive C No sustained oscillation 30 pF L Output Swing Sinking 1mA (Note 4) 2.05 V Open-Loop Gain A 88 dB VO Input Offset Voltage V IN to COM 2 mV OS Input Amplifier Slew Rate 2.5 V/s Input Amplifier Unity-Gain 3.5 MHz Bandwidth 2 MAX9737