2.3W Stereo Speaker Amplifiers and DirectDrive Headphone Amplifiers with Automatic Level Control

The MAX9756/MAX9757/MAX9758 combine dual, 2.3W, bridge tied load (BTL) stereo audio power amplifiers and a DirectDrive® headphone amplifier in a single device. These devices feature single-supply voltage operation, shutdown mode, logic-selectable gain, a headphone sense input, a 31-step analog volume control, and industry-leading click-and-pop suppression. The headphone amplifier uses Maxim's DirectDrive architecture that produces a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors.

The MAX9756/MAX9757 feature automatic level control (ALC) that automatically limits output power to the speaker in the event of an overpowered output.

The MAX9756/MAX9758s' 150mA internal linear regulator provides a complete solution for DAC- or CODEC-based designs.

The MAX9756/MAX9757/MAX9758 are offered in space-saving, thermally efficient 32-pin (5mm x 5mm x 0.8mm) and 36-pin thin QFN (6mm x 6mm x 0.8mm) packages. All devices are specified over the extended -40°C to +85°C temperature range.

Applications

* Flat-Panel TVs * LCD Projectors * Notebook PCs * PC Displays * Portable Audio * Portable DVD Players * Tablet PCs

* Automatic Level Control—Protects Speakers

* Analog Volume Control

* 120mW DirectDrive Headphone Amplifiers (16Ω)

* 150mA Adjustable LDO

* Class AB, 2.3W, Stereo BTL Speaker Amplifiers (3Ω)

* High 95dB PSRR

* Low-Power Shutdown Mode

* Industry-Leading Click-and-Pop Suppression

* Short-Circuit and Thermal Protection

* Beep Input