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