Description

    The AT8803 current regulator operates from a 6.5V to 40V input voltage range and delivers up to a total of 350mA to one or more strings of high-brightness LEDs. The output current of the AT8803 is adjusted by using an external current-sense resistor in series with the LEDs. An enable input allows wide-range “pulsed” dimming. Wave-shaping circuitry reduces EMI. The dif-ferential current-sense input increases noise immunity. The AT8803 is well suited for applications requiring high-voltage input and is able to withstand automotive load-dump events up to 40V. An on-board pass ele-ment minimizes external components while providing ±3.5% output current accuracy. Additional features include a 5V regulated output and short-circuit and thermal protection.  

    The AT8803 is available in a thermally enhanced, 5mm x 5mm, 16-pin TQFN package and is specified over the automotive -40°C to +125°C temperature range.

Applications

    Automotive Interior: Map, Courtesy, and Cluster

    Lighting

    Automotive Exterior: Tail Lights and CHMSL

    Warning Lights for Emergency Vehicles

    Navigation and Marine Indicators

    General Illumination

    Signage, Gasoline Canopies, Beacons

Features

     +6.5V to +40V Operating Range

    Adjustable Level (35mA to 350mA)

    ±3.5% Output Current Accuracy

    Integrated Pass Element with Low-Dropout Voltage (0.5V typ)

    Output Short-Circuit Protection

    +5V Regulated Output with 4mA Source Capability

    Thermal Shutdown

    Differential LED Current Sense

    High-Voltage Enable Pin for Dimming Interface

    Low Shutdown Supply Current (12μA typ)

    Low 204mV Current-Sense Reference Reduces Power Losses

    Wave-Shaped Soft Edges Reduce Radiated EMI During PWM Dimming

    Available in Small, Thermally Enhanced, 5mm x 5mm, 16-Pin TQFN Package

Diagram