General Description
The MAX9877 combines a high-efficiency Class D audio power amplifier with a stereo Class AB capacitor less DirectDrive® headphone amplifier. Maxim’s 3rd generation, filterless Class D amplifier with active emissions limiting technology provides Class AB performance with Class D efficiency.
The MAX9877 delivers up to 725mW from a 3.7V supply into an 8Ω load with 87% efficiency to extend battery life. The filterless modulation scheme combined with active emissions limiting circuitry and spread-spectrum modulation greatly reduces EMI while eliminating the need for output filtering used in traditional Class D devices.

Features
♦ Low Emissions, Filterless Class D Amplifier
   Achieves Better than 10dB Margin Under EN55022
   Class B Limits
♦ Low RF Susceptibility Design Rejects TDMA
   Noise from GSM Radios
♦ Input Mixer with User-Defined Input Mode
♦ 725mW Speaker Output (RSPK = 8Ω, PVDD = 3.7V)
♦ 53mW Headphone Output (RHP = 16Ω, VDD = 3.7V)
♦ Low 0.05% THD+N at 1kHz (Class D Power
   Amplifier)
♦ Low 0.016% THD+N at 1kHz (Headphone
   Amplifier)
♦ 87% Efficiency (RSPK = 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
♦ Click-and-Pop Suppression
♦ Current-Limit and Thermal Protection
♦ Available in a Space-Saving, 2.5mm x 2.0mm WLP
   Package

Applications
   Cell Phones
   Portable Multimedia Players