10W Stereo/15W Mono, Filterless, Spread-Spectrum, Class D Amplifiers

The MAX9703/MAX9704 mono/stereo Class D audio power amplifiers provide Class AB amplifier performance with Class D efficiency, conserving board space and eliminating the need for a bulky heatsink. Using a Class D architecture, these devices deliver up to 15W while offering up to 78% efficiency. Modulation and switching schemes render the traditional Class D output filter unnecessary.

The MAX9703/MAX9704 offer two modulation schemes: a fixed-frequency mode (FFM), and a spread-spectrum mode (SSM) that reduces EMI-radiated emissions due to the modulation frequency. The device utilizes a fully differential architecture, a full bridged output, and comprehensive click-and-pop suppression.

The MAX9703/MAX9704 feature high 80dB PSRR, low 0.07% THD+N, and SNR in excess of 95dB. Short-circuit and thermal-overload protection prevent the devices from being damaged during a fault condition. The MAX9703 is available in a 32-pin TQFN (5mm x 5mm x 0.8mm) package. The MAX9704 is available in a 32-pin TQFN (7mm x 7mm x 0.8mm) package. Both devices are specified over the extended -40°C to +85°C temperature range.

Applications

* Desktop PCs * Hands-Free Car Phone Adapters * LCD Monitors * LCD Projectors * LCD TVs

* Filterless Class D Amplifier

* Unique Spread-Spectrum Mode Offers 5dB Emissions Improvement Over Conventional Methods

* Up to 78% Efficient (RL = 8Ω)

* Up to 88% Efficient (RL = 16Ω)

* 15W Continuous Output Power into 8Ω (MAX9703)

* 2x10W Continuous Output Power into 8Ω (MAX9704)

* Low 0.07% THD+N

* High PSRR (80dB at 1kHz)

* 10V to 25V Single-Supply Operation

* Differential Inputs Minimize Common-Mode Noise

* Pin-Selectable Gain Reduces Component Count

* Industry-Leading Click-and-Pop Suppression

* Low Quiescent Current (24mA)

* Low-Power Shutdown Mode (0.2μA)

* Short-Circuit and Thermal-Overload Protection

* Available in Thermally Efficient, Space-Saving Packages

* 32-Pin TQFN (5mm x 5mm x 0.8mm)–MAX9703

* 32-Pin TQFN (7mm x 7mm x 0.8mm)–MAX9704