20W Stereo Class D Speaker Amplifier With Volume ControlThe MAX9744 20W stereo Class D Audio power amplifi-
er provides Class AB Amplifier performance with Class
D efficiency, conserving board space and eliminating
the need for a bulky heatsink. This device features sin-
gle-supply operation, adjustable gain, shutdown mode,
a SYNC output, speaker mute, and industry-leading
click-and-pop suppression.
The MAX9744 features a 64-step dual-mode (analog or
digital), programmable Volume Control and mute func-
tion. The MAX9744 operates from a 4.5V to 14V single
supply and CAN deliver up to 20W per channel into a
4 speaker with a 14V supply.
The MAX9744 offers two modulation schemes: a fixed-
frequency modulation mode that allows one of several
preset switching frequencies to be selected, and a
spread-spectrum modulation mode that helps to
reduce EMI-radiated emissions.
The MAX9744 features high 75dB PSRR, low 0.04%
THD+N, and SNR in excess of 90dB. Robust short-cir-
cuit and thermal-overload protection prevent device
damage during a fault condition. The MAX9744 is avail-
able in a 44-pin thin QFN-EP (7mm x 7mm x 0.8mm)
package and is specified over the extended -40C to
+85C temperature range.
By Maxim Integrated Products
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