MAX9877

The MAX9877 delivers up to 725mW from a 3.7V supply into an 8 load with 87% efficiency to extend battery life. The MAX9877 is available in a thermally efficient, space-saving 20-bump WLP package. The MAX9877 combines a high-efficiency Class D audio power amplifier with a stereo Class AB capacitorless DirectDriveheadphone amplifier. Maxim's 3rd generation, filterless Class D amplifier with active emissions limiting technology provides Class AB performance with Class D efficiency. The filterless modulation scheme combined with active emissions limiting circuitry and spread-spectrum modulation greatly reduces EMI while eliminating the need for output filtering used in traditional Class D devices. A bypass mode feature disables the integrated Class D amplifier and utilizes an internal DPST switch to allow an external amplifier to drive the speaker that is connected at the outputs of the MAX9877. The stereo Class AB headphone amplifier in the MAX9877 uses 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 device utilizes a user-defined input architecture, three preamplifier gain settings, an input mixer, volume control, comprehensive click-and-pop suppression, and I2C control.

The features of MAX9877 can be summarized as (1)Low Emissions, Filterless Class D Amplifier Achieves Better than 10dB Margin Under EN55022 Class B Limits; (2)low RF susceptibility design rejects TDMA noise from GSM radios; (3)input mixer with user-defined input mode; (4)725mW speaker output (RSPK = 8, PVDD = 3.7V); (5)53mW headphone output (RHP = 16, VDD = 3.7V); (6)low 0.05% THD+N at 1kHz (class d power amplifier); (7)low 0.016% THD+N at 1kHz (headphone amplifier); (8)87% efficiency (RSPK = 8, POUT = 750mW); (9)1.6 analog switch for speaker amplifier bypass; (10)high speaker amplifier PSRR (72dB at 217Hz); (11)high headphone amplifier PSRR (84dB at 217Hz); (12)I2C control; (13)hardware and software shutdown mode; (14)click-and-pop suppression; (15)current-limit and thermal protection; (16)available in a space-saving, 2.5mm x 2.0mm WLP package.

The absolute maximum ratings of MAX9877 are (1)VDD, PVDD to PGND:-0.3V to +5.5V; (2)VDD to PVDD: -0.3V to +0.3V; (3)VSS to PGND: -5.5V to +0.3V; (4)C1N to PGND:(VSS 0.3V)to +0.3V; (5)C1P to PGND: -0.3V to (PVDD + 0.3V); (6)HPL, HPR to VSS (Note 1): -0.3V to the lower of (PVDD (VSS + 0.3V))or +9V; (7)HPL, HPR to PVDD (Note 2): +0.3V to the higher of (VSS (PVDD 0.3V))or -9V; (8)GND to PGND: ±0.3V; (9)INA1, INA2, INB1, INB2, BIAS: -0.3V to +4V; (10)SDA, SCL: -0.3V to +5.5V; (11)all other pins to GND: -0.3V to (PVDD + 0.3V); (12)continuous current in/out of PVDD, PGND, OUT_: ±800mA; (13)continuous current in/out of HPR and HPL: 140mA; (14)continuous current in/out of RXIN+ and RXIN-: 150mA; (15)continuous input current: VSS: 100mA; (16)continuous input current: (all other pins): ±20mA; (17)duration of OUT_ short circuit to GND or PVDD: continuous; (18)duration of short circuit between OUT+ and OUT-: continuous; (19)duration of HP_ short circuit to GND or PVDD: continuous; (20)continuous power dissipation (TA = +70°C)20-bump WLP, 5 x 4, multilayer board (derate 13.0mW/°C above +70°C): 1.04W; (21)junction temperature: +150°C; (22)operating temperature range: -40°C to +85°C; (23)storage temperature range: -65°C to +150°C; (24)lead temperature (soldering, 10s): +300°C.