General Description
The MAX8821 integrates a charge pump for white LEDs, an audio loudspeaker amplifier, and two low noise LDOs controlled by an I2C control interface. The high-efficiency, adaptive-mode inverting charge pump drives up to six LEDs with constant current for uniform brightness. The LED current is controlled by an I2C interface and adjusts from 0.1mA to 25.6mA per LED into 32 pseudo-logarithmic steps. Independent voltages for each LED maximize efficiency even with large LED forward voltage (VF) mismatch. An internal temperature derating function reduces the current above +40°C to protect the LEDs.

Features
♦ White LED Inverting Charge Pump
    Independent Adaptive Current Regulators for Each LED
    6 Low-Dropout Current Regulators
    Flexible I2C Dimming Control for Each LED
    Ramp-Up/Down, Current Control for Each LED
    Low 70µA (typ) Quiescent Current
    TA Derating Function Protects LEDs
♦ Mono 2W Class D Loudspeaker Amplifier
    85% Efficiency (RL = 8Ω, POUT = 600mW)
    Low 0.05% THD+N at 1kHz
    High 65dB PSRR at 1kHz
    Fully Differential Inputs
    -3dB to +24dB Gain Settings in 3dB Steps
    Integrated Click-and-Pop Suppression
    Low Quiescent Current
♦ Dual Low-Noise LDO
    45µVRMS Output Noise, 70dB PSRR
    Flexible I2C-Controlled Output Voltages
    200mA and 300mA Output Current Drive

Applications
    Cell Phones and Smartphones
    PDAs, Digital Cameras, Camcorders
    MP3 Players, GPS Devices