MAX9791

The MAX9791 combines a stereo 2W Class D power amplifier, a stereo 180mW DirectDrive headphone amplifier, and a 120mA low-dropout (LDO)linear regulator in a single device. The MAX9791/MAX9792 wake-on-beep feature wakes up the speaker and headphone amplifiers when a qualified beep signal is detected at the BEEP input. For maximum flexibility, separate speaker and headphone amplifier control inputs provide independent shutdown of the speaker and headphone amplifiers. Additionally the LDO can be enabled independently of the audio amplifiers. The MAX9792 combines a mono 3W Class D power amplifier, a stereo 180mW DirectDrive headphone amplifier, and a 120mA LDO linear regulator in a single device. High 107dB DC PSRR and low 0.006% THD+N ensure clean, lowdistortion amplification of the audio signal. The ground sense feature senses and corrects for the voltage difference between the output jack ground and device signal ground. The MAX9791/MAX9792 feature Maxim's DirectDrive headphone amplifier architecture that produces a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors, saving cost, board space, and component height. This feature minimizes headphone amplifier crosstalk by sensing the impedance in the ground return trace and correcting for it at the output jack. This feature also minimizes ground-loop noise when the output socket is used as a line out connection to other grounded equipment (for example, a PC connected to a home hi-fi system). The MAX9791/ MAX9792 Class D amplifiers feature Maxim's spreadspectrum modulation and active emissions limiting circuitry. Industry-leading click-and-pop suppression eliminates audible transients during power-up and shutdown cycles. The MAX9791/MAX9792 feature thermal-overload and output short-circuit protection. The devices are available in 28-pin TQFN packages and are specified over the -40°C to +85°C extended temperature range. The MAX9791/MAX9792 feature low RF susceptibility, allowing the amplifiers to successfully operate in close proximity to wireless applications.

The features of MAX9791 can be summarized as (1)windows vistapremium compliant; (2)low EMI Filterless class d speaker amplifiers pass EN55022B emissions limit with 30cm of speaker cable; (3)180mW directdrive headphone amplifier; (4)excellent RF immunity; (5)integrated 120mA LDO; (6)eliminates headphone ground loop noise; (7)wake-on-beep function; (8)click-and-pop suppression; (9)short-circuit and thermal-overload protection; (10)thermally efficient, space-saving package 28-pin TQFN-EP (4mm x 4mm x 0.75mm).

The absolute maximum ratings of MAX9791 are (1)supply voltage (AVDD, PVDD, HPVDD to GND): -0.3V to +6.0V / (AVDD to PVDD): ±0.3V; (2)GND to PGND, CPGND: ±0.3V; (3)CPVSS, C1N to GND: -6.0V to + 0.3V; (4)HPL, HPR to CPVSS: -0.3V to lower of (HPVDD - CPVSS + 0.3V)and +9V; (5)HPL, HPR to HPVDD: +0.3V to the higher of (CPVSS - HPVDD - 0.3V)and -9V; (6)COM, SENSE: -0.3V to + 0.3V; (7)any other pin: -0.3V to (AVDD + 0.3V); (8)duration of short circuit between OUT_+, OUT_- and GND, PGND, AVDD, or PVDD: continuous; (9)duration of short circuit between LDO_OUT and AVDD, GND (Note 1): continuous; (10)duration of short circuit between HPR, HPL and GND: continuous; (11)continuous current (PVDD, OUT_+, OUT_-, PGND): 1.7A; (12)continuous current (C1N, C1P, CPVSS, AVDD, HPVDD, LDO_OUT, HPR, HPL): 850mA; (13)continuous input current (all other pins): ±20mA; (14)continuous power dissipation (TA = +70°C)28-pin thin QFN single-layer board (derate 20.8mW/°C above +70°C): 1667mW / junction-to-ambient thermal resistance (JA): 40°C/W / junction-to-case thermal resistance (JC): 2.7°C/W / 28-pin thin QFN multilayer board (derate 28.6mW/°C above +70°C): 2286mW / junction-to-ambient thermal resistance (JA): 35°C/W / junction-to-case thermal resistance (JC): 2.7°C/W; (15)ESD protection, human body model: ±2kV; (16)operating temperature range: -40°C to +85°C; (17)junction temperature: +150°C; (18)storage temperature range: -65°C to +150°C; (19)lead temperature (soldering, 10s): +300°C.