MAX9703/MAX9704 Mono/Stereo Class D Audio Power Amplifiers

MAX9703/MAX9704 Mono/Stereo Class D Audio Power Amplifiers Provide Class AB performance with Class D efficiency, saving board space and eliminating the need for large heat sinks. These devices use Class D architecture to deliver up to 78% efficiency at up to 15W. The modulation and switching scheme eliminates the output filter of traditional Class D amplifiers.

The MAX9703/MAX9704 have two modulation modes: fixed frequency mode (FFM) and spread spectrum mode (SSM). The SSM mode reduces the EMI radiation generated by the modulation frequency. This device uses a fully differential structure, a full bridge output, and comprehensive noise suppression.

The MAX9703/MAX9704 feature a high PSRR of 80dB, a low THD+N of 0.07%, and an SNR of over 95dB. Short-circuit and thermal-overload protection prevent device damage in the event of 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 wide -40°C to +85°C temperature range.

Key Features

Filter-free Class D amplifier

Unique spread spectrum mode reduces radiation by 5dB compared to traditional methods

Efficiency up to 78% (RL = 8Ω)

Efficiency up to 88% (RL = 16Ω)

15W Output Power into 8Ω Load (MAX9703)

2x10W Output Power into 8Ω Load (MAX9704)

Low THD+N of 0.07%

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 noise suppression

Low quiescent current (24mA)

Low Power Shutdown Mode (0.2µA)

Short circuit and thermal overload protection

Thermally efficient and space-saving package

32-pin TQFN (5mm x 5mm x 0.8mm)-MAX9703

32-pin TQFN (7mm x 7mm x 0.8mm)-MAX9704