Features and Benefits

  • Windows 2000/XP/Vista (32-Bit)-Compatible Software
  • CMAXQBUSB+ Interface Board with USB PC Connection (Cable Included)
  • Proven PCB Layout
  • Fully Assembled and Tested
  • White LED Inverting Charge Pump
    • Independent Adaptive Current Regulators for Each LED
    • Six 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, 73dB PSRR
    • Flexible I²C-Controlled Output Voltages
    • 200mA and 300mA Output Current Drive

Product Details

The MAX8821 evaluation kit (EV kit) is a fully assembled and tested circuit for evaluating the MAX8821 white LED charge pump with a mono Class D audio amplifier and dual LDOs. The MAX8821 EV kit operates from a 2.7V to 5.5V input supply range and is controlled by an I²C interface. The MAX8821 features a high-efficiency, adaptive-mode inverting charge pump that drives up to six LEDs with constant current for uniform brightness.

The EV kit also includes Windows® 2000/XP/Vista®-compatible software that provides a simple graphical user interface (GUI) for exercising the features of the MAX8821. The EV kit software features an I²C interface to control the LED current, ramp-up/ramp-down time, and blink on/off-time. An internal temperature derating function reduces the current above +40°C to protect the LEDs.

The MAX8821 also features a mono Class D audio amplifier with adjustable gain, through the I²C interface, from -3dB to +24dB in ten 3dB steps. The I²C control interface selects the audio amplifier fixed-frequency mode or spread-spectrum mode, in addition to selecting individual LDO output voltages.


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

Applicable Parts

Documentation & Resources