MAX9742 19-0731 Rev 0 1/07 Single-/Dual-Supply, Stereo 16W, Class D Amplifier with Differential Inputs General Description Features 2 x 16W Output Power (R = 4, THD+N = 10%) The MAX9742 stereo Class D audio power amplifier L delivers up to 2 x 16W into 4 loads. The MAX9742 High Efficiency: Up to 92% with R = 8 L features high-power efficiency (92% with 8 loads), Mute and Shutdown Modes eliminating the need for a bulky heatsink and conserv- Differential Inputs Suppress Common-Mode Noise ing power. The MAX9742 operates from a 20V to 40V Adjustable Gain single supply or a 10V to 20V dual supply. Features include fully differential inputs, comprehensive click- Integrated Click-and-Pop Suppression and-pop suppression, low-power shutdown mode, and Low 0.06% THD+N at 3.5W, R = 8 L an externally adjustable gain. Short-circuit and thermal- Output Short-Circuit and Thermal Protection overload protection prevent the device from being Available in Space-Saving, 6mm x 6mm, 36-Pin damaged during a fault condition. TQFN Package The MAX9742 is available in a thermally efficient 36-pin TQFN (6mm x 6mm x 0.8mm) package and is specified Ordering Information over the -40C to +85C extended temperature range. PKG PART TEMP RANGE PIN-PACKAGE CODE Applications MAX9742ETX+ -40C to +85C 36 TQFN-EP* T3666-3 CRT TVs +Denotes lead-free package. Flat-Panel Display TVs *EP = Exposed paddle. Audio Docking Stations Pin Configuration located at end of data sheet. Multimedia Monitors Simplified Block Diagrams R F1 SINGLE-SUPPLY CONFIGURATION C FBL 20V TO 40V FBL V DD C IN R IN1 INL- LEFT NEGATIVE MAX9742 AUDIO INPUT C C IN R OUT IN2 L CLASS D F INL+ LEFT POSITIVE OUTL MODULATOR AND AUDIO INPUT HALF-BRIDGE R ZBL R C F2 FBL C F V MID DD C ZBL 2 R C F2 FBR C OUT L CLASS D F C OUTR IN R IN2 MODULATOR AND INR+ RIGHT POSITIVE HALF-BRIDGE AUDIO INPUT R ZBL C IN R IN1 INR- C RIGHT NEGATIVE F CONTROL LOGIC/ AUDIO INPUT C ZBL POWER-UP SEQUENCING FBR SFT V SHDN SS C FBR C ON SFT OFF R F1 Simplified Block Diagrams continued at end of data sheet. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLESingle-/Dual-Supply, Stereo 16W, Class D Amplifier with Differential Inputs ABSOLUTE MAXIMUM RATINGS V to V , NSENSE..............................................-0.3V to +45V Continuous Power Dissipation (T = +70C) (Note 1) DD SS A MID, LGND, LV , REGM, REGP, OUTR, Single-Layer Board: DD OUTL to V .......................................................-0.3V to +45V 36-Pin TQFN (derate 26.3mW/C above +70C) ...........2.11W SS MID, LGND, LV , REGM, REGP, OUTR, Multilayer Board: DD OUTL to V .......................................................-45V to +0.3V 36-Pin TQFN (derate 35.7mW/C above +70C) ...........2.86W DD REGLS to V .........................................................-0.3V to +12V Junction-to-Ambient Thermal Resistance ( ) SS JA MID to REGP, REGM...............(V - 0.3V) to (V + 0.3V) Single-Layer Board: REGM REGP REGP to REGM.......................................................-0.3V to +12V 36-Pin TQFN.................................................................38C/W LV to LGND..........................................................-0.3V to +6V Multilayer Board: DD SHDN to LGND.........................................................-0.3V to +4V 36-Pin TQFN.................................................................28C/W SFT to LGND ............................................................-0.3V to +6V Junction-to-Case Thermal Resistance ( ) ...................1.4C/W JC FB , IN +, IN -, REFCUR to REGP, Operating Temperature Range ...........................-40C to +85C REGM..................................(V - 0.3V) to (V + 0.3V) Maximum Junction Temperature .....................................+150C REGM REGP BOOTR to OUTR ....................................................-0.3V to +12V Storage Temperature Range .............................-65C to +150C BOOTL to OUTL .....................................................-0.3V to +12V Lead Temperature (soldering, 10s) .................................+300C OUTR, OUTL Shorted to LGND..................................Continuous Note 1: Actual power capabilities are dependent on PCB layout. See the Thermal Considerations section. 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 CHARACTERISTICSSingle-Supply, Single-Ended Output (V = 24V, V = V = LGND = 0V, V = 3.3V, V = 12V, C = 660F, C = 10F, C = 10F, R1 = R2 = R3 = DD SS SUB SHDN MID VDD MID1 MID2 10k, C = 0.47F, C = 1000F, C = 150pF, C = 10pF, C = 0.1F, C = C = 1F, R = 30.1k, SFT OUT FB 1 FB 2 BOOT REGP REGM IN R = 121k, R = 562k, R = 681k, R = 68k, R = , T = T to T , unless otherwise noted. Typical values are at F1A F1B F2 REF L A MIN MAX T = +25C.) (Note 2) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage Range V (Note 3) 20 40 V DD Supply Current I No load, output filter removed 15 mA DD Mute Mode Supply Current No load, V = 0V (outputs not switching) 8 mA SFT Shutdown Current No load, V = 0V 0.8 1.3 mA SHDN Switching Frequency f 300 kHz SW Power-Supply Rejection Ratio PSRR V = 24V + 500mV , f = 1kHz 68 dB DD P-P (Note 4) Crosstalk L to R, R to L, R = 8 , P = 1W, f = 1kHz -78 dB L OUT (Notes 5 and 6) R = 8 , f = 1kHz, THD+N = 10% 9.5 L IN Continuous Output Power R = 8 , f = 1kHz, THD+N = 10%, L IN P W OUT 20.5 (Notes 5, 6, and 7) V = 35V DD R = 4 , f = 1kHz, THD+N = 10% 16 L IN Efficiency R = 8 , P = 9.5W, THD+N = 10% 92 % L OUT (Notes 5, 6, and 7) 2 MAX9742