The MAX9709 stereo/mono, Class D audio power amplifier
delivers up to 2 x 25W into an 8Ω stereo mode and
1 x 50W into a 4Ω load in mono mode while offering up to
87% efficiency. The MAX9709 provides Class AB amplifier
performance with the benefits of Class D efficiency,
eliminating the need for a bulky heatsink and conserving
power. The MAX9709 operates from a single +10V to
+22V supply, driving the load in a BTL configuration.
The MAX9709 offers two modulation schemes: a fixed-frequency
modulation (FFM) mode, and a spread-spectrum
modulation (SSM) mode that reduces EMI-radiated emissions.
The MAX9709 can be synchronized to an external
clock from 600kHz to 1.2MHz. A synchronized output
allows multiple units to be cascaded in the system.
Features include fully differential inputs, comprehensive
click-and-pop suppression, and four selectable-gain settings
(22dB, 25dB, 29.5dB, and 36dB). A pin-programmable
thermal flag provides seven different thermal
warning thresholds. Short-circuit and thermal-overload
protection prevent the device from being damaged
during a fault condition.
The MAX9709 is available in a 56-pin TQFN (8mm x
8mm x 0.8mm) package, and is specified over the
extended -40°C to +85°C temperature range.