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