Description

    AT8821 is a DC/DC step-up converter that delivers an accurate constant current for driving LEDs. Operation at a fixed switching frequency of 1MHz allows the device to be used with small value external ceramic capacitors and inductor. LEDs connected in series are driven with a regulated current set by the external resistor. The AT8821 is ideal for driving up to eight white LEDs in series or up to 30V.

Features

     Input voltage range 2.5V to 30V

    Switch current limit 2A

    Drives LED strings up to 30V 

    1MHz fixed frequency minimizes the external components

    Internal softstart limits the inrush current

    Open LED overvoltage protection

    RoHS Compliant and Halogen Free

    Compact package: SOT23-6 pin

Applications

    GPS Navigation ATstems

    Handheld Devices

    Portable Media Players

Typical Applications