General Description

The MAX16803 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 (HB LEDs). The output current of the MAX16803 is adjusted by using an external current-sense resistor in series with the LEDs. A dimming input allows wide range “pulsed” PWM operation. Wave-shaping circuitry reduces EMI. The differential current-sense input increases noise immunity. The MAX16803 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 element minimizes external components while providing ±3.5 output-current accuracy. Additional features include a 5V regulated output and short-circuit and thermal protection.

Features

♦ +6.5V to +40V Operating Range

♦ Adjustable LED Current (35mA to 350mA)

♦ ±3.5 LED Current Accuracy

♦ High-Voltage DIM Pin for Dimming Interface

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

♦ +5V Regulated Output with 4mA Source Capability

♦ Parallel Operation for LED Current > 350mA

♦ Differential LED Current Sense

♦ Low Shutdown Supply Current (12µA typ)

♦ Low 204mV Current-Sense Reference Reduces Power Losses

♦ Wave-Shaped Edges Reduce Radiated EMI During PWM Dimming

♦ Thermal Shutdown

♦ Output Short-Circuit Protection

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

♦ -40°C to +125°C Operating Temperature Range

Applications

    Automotive Interior: Map, Courtesy, and Cluster Lighting

    Automotive Exterior: Rear Combination Lights (RCLs)

    Emergency Vehicle Warning Lights

    Navigation and Marine Indicators

    General Lighting

    Signage, Gasoline Canopies, Beacons