Stereo Subsystem provides rich audio from li-ion battery.

Press Release Summary:

Supplied in 2.5 x 3 mm UCSP(TM), MAX9879 combines stereo Class D speaker amp, DirectDrive® stereo headphone amp, and analog bypass switch. Class D amplifier technologies provide Class AB audio performance with Class D efficiency. Able to deliver 715 mW output power from 3.7 V supply into 8 ohm load with 88% max efficiency, product also features input mixing, volume control, click-and-pop suppression, and flexible, user-defined input architecture with preamplifier gain settings.

Original Press Release:

Stereo Subsystem Provides Richest Audio Quality and Highest Output Power from a Lithium-Ion Battery

Stereo audio subsystem provides highest output power from lithium-ion battery.

SUNNYVALE, CA-August 31, 2009-Maxim Integrated Products (NASDAQ: MXIM) introduces the MAX9879, a stereo audio subsystem that sets new benchmarks for integration and performance. This device combines a high-efficiency, high-power, stereo Class D speaker amplifier; a DirectDrive® stereo headphone amplifier; and an ultra-low-noise, analog bypass switch. In addition to this integration, the MAX9879 employs Maxim's third-generation, ultra-low-EMI, Class D amplifier technologies to provide Class AB audio performance with Class D efficiency. It thus delivers 715mW of output power from a 3.7V supply into an 8W load with 88% (max) efficiency. Providing the industry's highest output power from a lithium-ion battery, the MAX9879 is ideal for cellular phones, portable media players (PMPs), and other applications that require high audio quality, output power, and efficiency.

Maxim's patented DirectDrive architecture* produces a ground-referenced output from a single supply, thus eliminating the need for large DC-blocking capacitors. To further save cost and space, the MAX9879 combines Maxim's patented Class D technologies, active-emissions limiting** and spread-spectrum modulation***, to significantly reduce EMI and eliminate the output filters typically required by Class D amplifiers. Additionally, the integrated low-noise, analog DPST audio switch allows users to bypass the Class D amplifier for reduction of power consumption in portable devices, thus eliminating the need for an external switch.

The MAX9879 offers best-in-class click-and-pop performance with no audible artifacts at power on/off and also high RF/TDMA noise rejection, which simplifies the design iteration process. Additional features include input mixing, volume control, comprehensive click-and-pop suppression, and a flexible, user-defined input architecture with preamplifier gain settings. All controls are enabled through an I²C interface.

The MAX9879 is packaged in a 2.5mm x 3mm, 30-bump UCSP(TM) that is fully specified over the -40°C to +85°C extended temperature range. Prices start at $1.35 (1000-up, FOB USA). An evaluation kit is available to speed designs.

Maxim Integrated Products is a publicly traded company that designs, manufactures, and sells high-performance semiconductor products. The Company was founded over 25 years ago with the mission to deliver innovative analog and mixed-signal engineering solutions that add value to its customers' products. To date, it has developed over 6100 products serving the industrial, communications, consumer, and computing markets.

Maxim reported revenue in excess of $1.6 billion for fiscal 2009. A Fortune 1000 company, Maxim is included in the Nasdaq 100, the Russell 1000, and the MSCI USA indices. For more information, go to

*U.S. Patent #7,061,327.
**U.S. Patent #7,190,225.
***U.S. Patent #6,847,257.

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