MAX9775

The MAX9775 is available in a 36-bump WLP package. The MAX9775/MAX9776 deliver 1.5W per channel into a 4 load from a 5V supply and offer efficiencies up to 79%. The MAX9775/MAX9776 combine a high-efficiency Class D, stereo/mono audio power amplifier with a mono DirectDrive receiver amplifier and a stereo DirectDrive headphone amplifier. Maxim's 3rd-generation, ultra-low-EMI, Class D audio power amplifiers provide Class AB performance with Class D efficiency. Active emissions limiting circuitry and spread-spectrum modulation greatly reduce EMI, eliminating the need for output filtering found in traditional Class D devices. The MAX9775/MAX9776 utilize a fully differential architecture, a full-bridged output, and comprehensive clickand-pop suppression. All control is done through I2C. The mono receiver amplifier and stereo headphone amplifier use Maxim's DirectDrive architecture that produces a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors, saving cost, space, and component height. The MAX9776 is available in a 32-pin TQFN (5mm x 5mm)or a 36-bump WLP (3mm x 3mm)package. Both devices are specified over the extended -40°C to +85°C temperature range. A 3D stereo enhancement function allows the MAX9775 to widen the stereo sound field immersing the listener in a cleaner, richer sound experience than typically found in portable applications. The devices utilize a flexible, user-defined mixer architecture that includes an input mixer, volume control, and output mixer.

The features of MAX9775 can be summarized as (1)unique spread-spectrum modulation and active emissions limiting significantly reduces EMI; (2)3D stereo enhancement (MAX9775 Only); (3)up to 3 stereo inputs; (4)1.5W stereo speaker output (4, VDD = 5V); (5)50mW mono receiver/stereo headphone outputs (32, VDD = 3.3V); (6)high PSRR (68dB at 217Hz); (7)79% efficiency (VDD = 3.3V, RL = 8, POUT = 470mW); (8)I2C control-input configuration, volume control, output mode; (9)click-and-pop suppression; (10)low total harmonic distortion (0.03% at 1kHz); (11)current-limit and thermal protection; (12)available in space-saving, 36-bump WLP (3mm x 3mm)and 32-pin TQFN (5mm x 5mm)packages.

The absolute maximum ratings of MAX9775 are (1)VDD to GND: 6V; (2)PVDD to PGND: 6V; (3)CPVDD to CPGND: 6V; (4)CPVSto CPGND: -6V to +0.3V; (5)VSto CPGND: -6V to +0.3V; (6)C1N: (CPVS- 0.3V)to (CPGND + 0.3V); (7)C1P: (CPGND - 0.3V)to (CPVDD + 0.3V); (8)HPL, HPR to GND: (CPVS- 0.3V)to (CPVDD + 0.3V); (9)GND to PGND and CPGND: ±0.3V; (10)VDD to PVDD and CPVDD: ±0.3V; (11)SDA, SCL to GND: -0.3V to +6V; (12)all other pins to GND: -0.3V to (VDD + 0.3V); (13)continuous current in/out of PVDD, PGND, CPVDD, CPGND, OUT__, HPR, and HPL: ±800mA; (14)continuous input current CPVS: 260mA; (15)continuous input current (all other pins): ±20mA; (16)duration of short circuit between OUT_+ and OUT_-: continuous; (17)duration of HP_, out_ short circuit to GND or PVDD: continuous; (18)continuous power dissipation (TA = +70°C); (19)36-Bump (3mm x 3mm)UCSP multilayer board (derate 17.0mW/°C above +70°C): 1360.5mW / 32-pin (5mm x 5mm)TQFN single-layer board (derate 21.3mW/°C above +70°C): 1702.1mW / 32-pin TQFN multilayer board (derate 34.5mW/°C above +70°C): 2758.6mW; (20)junction temperature: +150°C; (21)operating temperature range: -40°C to +85°C; (22)storage temperature range: -65°C to +150°C; (23)lead temperature (soldering, 10s): +300°C.