General Description

The MAX9879 combines a high-efficiency stereo Class D audio power amplifier with a stereo capacitor-less DirectDrive® headphone amplifier. Maxim’s filterless class D amplifiers with active emissions limiting technology provide Class AB performance with Class D efficiency.

The Class D power amplifier delivers up to 715mW from a 3.7V supply into an 8Ω load with 88 efficiency to extend battery life. The filterless modulation scheme combined with active emission limiting circuitry and spread-spectrum modulation greatly reduces EMI while eliminating the need for output filtering used in traditional Class D devices.

Features

♦ Better than 9dB Margin Under EN 55022 Class B

   Limits with No Filter Components

♦ Low RF Susceptibility Design Rejects TDMA

   Noise from GSM Radios

♦ Input Mixer with User Defined Input Mode

♦ Stereo 715mW Speaker Output (RL = 8Ω,

   VDD = 3.7V)

♦ Stereo 58mW Headphone Output (16Ω,

   VDD = 3.7V)

♦ Low 0.04 THD+N at 1kHz (Class D Power

   Amplifier)

♦ Low 0.018 THD+N at 1kHz (Headphone

   Amplifier)

♦ 88 Efficiency (RL = 8Ω, POUT = 750mW)

♦ 1.6Ω Analog Switch for Speaker Amplifier Bypass

♦ High Speaker Amplifier PSRR (72dB at 217Hz)

♦ High Headphone Amplifier PSRR (84dB at 217Hz)

♦ I2C Control

♦ Hardware and Software Shutdown Mode

♦ Ultra-Low Click and Pop

♦ Robust Design with Current and Thermal

   Protection

♦ Available in Space-Saving Package

   5x6 UCSP (2.5mm x 3mm)

Applications

   Cell Phones

   Portable Multimedia Players