19-0731; Rev 0; 1/07 AXA EVALUATION KIT AVAILABLE Single-/Dual-Supply, Stereo 16W, Class D Amplifier with Differential Inputs General Description Features MAX9742 The MAX9742 stereo Class D audio power amplifier → 2 × 16W Output Power (R L = 42, THD+N = 10%) delivers up to 2 × 16W into 4 2 loads. The MAX9742 → High Efficiency: Up to 92% with R L = 82 features high-power efficiency (92% with 8 Ω 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 single supply or a ±10V to ±20V dual supply. Features → Adjustable Gain 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 L = 82 an externally adjustable gain. Short-circuit and thermal- → Output Short-Circuit and Thermal Protection overload protection prevent the device from being damaged during a fault condition. → Available in Space-Saving, 6mm x 6mm, 36-Pin 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 -40°C to +85°C extended temperature range. PKG PART TEMP RANGE PIN-PACKAGE CODE Applications MAX9742ETX+ 36 TQFN-EP* T3666-3 -40°C to +85°℃C 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 SINGLE-SUPPLY CONFIGURATION RF1 20V TO 40V CIN RINT LEFT NEGATIVE WIXVW MAX9742 AUDIO INPUT CIN RIN2 COUT CLASS D LEFT POSITIVE INL+ AUDIO INPUT HALF-BRIDGE VDD RIN RIGHT POSITIVE MODULATOR AND AUDIO INPUT HALF-BRIDGE CIN RINT RIGHT NEGATIVE NR CONTROL LOGIC/ AUDIO INPUT POWER-UP SEQUENCING NOHS CFBR 'ON V Simplified Block Diagrams continued at end of data sheet. AIXVA 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. Single-/Dual-Supply, Stereo 16W! Class D Amplifier with Differential Inputs 742 ABSOLUTE MAXIMUM RATINGS VDD to Vss, NSENSE.. ..-0.3V to +45V Continuous Power Dissipation (T A = +70°C) (Note 1) MID, LGND, LV DD, REGM, REGP, OUTR, 6X Single-Layer Board: OUTL to V ss ...-0.3V to +45V 36-Pin TQFN (derate 26.3mW/°C above +70°C)....11W MID, LGND, LV DD, REGM, REGP, OUTR, Multilayer Board: MA OUTL to V DD. -45V to +0.3V 36-Pin TQFN (derate 35.7mW/°C above +70°C)...2.86W REGLS to V SS .... ..-0.3V to +12V Junction-to-Ambient Thermal Resistance (QJA) MID to REGP, REGM. ..(V REGM - 0.3V) to (V REGP + 0.3V) Single-Layer Board: REGP to REGM. ...-0.3V to +12V 36-Pin TQFN .38°CW LVDD to LGND. ..-0.3V to +6V Multilayer Board: SHDN to LGND. .-0.3V to +4V 36-Pin TQFN. 28°C/W SFT to LGND -0.3V to +6V Junction-to-Case Thermal Resistance ( JC). 1.4°CW FB_, IN_+, IN_-, REFCUR to REGP, Operating Temperature Range 0℃Cto+85°℃ REGM. ..(V REGM - 0.3V) to (V REGP + 0.3V) Maximum Junction Temperature. +150°C BOOTR to OUT... .-0.3V to +12V Storage Temperature Range. -65℃ to +150°℃ BOOTL to OUTL.. .-0.3V to +12V Lead Temperature (soldering, 10s). +300°℃ 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 (VDD = 24V, V SS = VSUB = LGND = OV, V SHDN = 3.3V, V MID = 12V, C VDD = 660μF, C MID1 = 10μF, C MID2 = 10μF, R1 = R2 = R3 = RF1A = 121k 2