DESCRITION

      The AT8831 is a current-regulated charge pump and ideal for powering high brightness LEDs for camera flash and torch applications. The charge pump can be set to regulate two current levels for FLASH and TORCH modes. TheAT8831 automatically switches between linear and boost modes ensuring that LED current does not depend on the LED forward voltage.

   AT8831 provides low cost, space saving solution for driving LED. It also integrates thermal and short circuit protection function.

   AT8831 is available in DFN-10 (3mm × 3mm). It operates from 2.7V to 5.5V over the temperature range of -40°C to +85°C.

FEATURES

    Operates from 2.7V to 5.5V

    Up to 90% efficiency in Torch Mode

    Output current up to 750mA

    Adjustable output current in Flash Mode

    Minimum external components, no external inductor required

    Automatic boost mode

     Less than 1µA shutdown current

    Low ripple and EMI

    Over voltage protection on output

    Short and over temperature protections

    Available in DFN-10 (3mm × 3mm) package

APPLICATIONS

    White LED backlighting

    Cellular phones

    Generic lighting/flash/strobe applications

TYPICAL APPLICATION CIRCUIT