High-Voltage, 350mA, Adjustable Linear High-Brightness LED Driver

The MAX16835 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 MAX16835 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 differential current-sense input increases noise immunity. The MAX16835 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.

The MAX16835 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

* +6.5V to +40V Operating Range

* Adjustable LED Current (35mA to 350mA)

* ±3.5% Output Current Accuracy

* Integrated Pass Element with Low-Dropout Voltage (0.55V 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 (35µA typ)

* Low 200mV Current-Sense Reference Reduces Power Losses

* Wave-Shaped Edges Reduce Radiated EMI During PWM Dimming

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

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