MAX9773

V_DD to GND..............................................................................6V
V_DD to PV_DD .........................................................-0.3V to +0.3V
PV_DD to PGND .........................................................................6V
GND to PGND .......................................................-0.3V to +0.3V
All Other Pins to GND.................................-0.3V to (V_DD + 0.3V)
Continuous Current In/Out of PVDD, PGND, OUT_........±800mA
Continuous Input Current (all other pins).......................±20mA
Duration of OUT_ Short Circuit to
    V_DD/GND/PVDD/PGND...........................................Continuous
Duration of Short Circuit Between OUT+ and OUT- ...Continuous
Continuous Power Dissipation (T_A = +70°C)
   20-Bump UCSP (derate 10mW/°C above +70°C) ........800mW
   24-Pin Thin QFN (derate 20.8mW/°C above +70°C)..1666.7mW
Junction Temperature......................................................+150°C
Operating Temperature Range .........................-40°C to +85°C
Storage Temperature Range ..........................-65°C to +150°C
Bump Temperature (soldering) Reflow............................+235°C
Lead Temperature (soldering, 10s) ................................+300°C

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.

The MAX9773 3rd-generation, ultra-low EMI, stereo,Class D audio power amplifier provides Class AB performance with Class D efficiency. The MAX9773 delivers 1.8W per channel into a 4 load, and offers efficiencies above 90%. Active emissions limiting (AEL) circuitry greatly reduces EMI by actively controlling the output FET gate transitions under all possible transient conditions. AEL controls high-frequency emissions resulting from conventional Class D free-wheeling behavior in the presence of an inductive load. Zerodead-time (ZDT) technology of MAX9773 maintains state-of-the-art efficiency and THD+N performance by allowing the output FETs to switch simultaneously without cross conduction.

A patented spread-spectrum modulation scheme of MAX9773 eliminates the need for output filtering found in traditional Class D devices. These design concepts reduce component count and extend battery life.

The MAX9773 offers two modulation schemes: a fixedfrequency (FFM) mode, and a spread-spectrum (SSM) mode that reduces EMI-radiated emissions. The MAX9773 oscillator can be synchronized to an external clock through the SYNC input, allowing synchronization of multiple Maxim Class D amplifiers. The sync output (SYNC_OUT) can be used for a master-slave application where more channels are required. The MAX9773 features a fully differential architecture, a full bridge-tied load (BTL) output, and comprehensive click-and-pop suppression. The device features internally set gains of 12dB, 15.6dB, 20dB, and 26dB selected through two gain-select inputs, further reducing external component count.

The MAX9773 features high 80dB PSRR, less than 0.1% THD+N, and SNR in excess of 88dB. Short-circuit and thermal-overload protection prevent the device from being damaged during a fault condition. The MAX9773 is available in 24-pin thin QFN-EP (4mm x 4mm x 0.8mm), and 20-bump UCSP™ (2mm x 2.5mm x 0.6mm) packages. The MAX9773 is specified over the extended -40°C to +85°C temperature range.