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Optoelectronics/Displays??

HB LED drivers handle long LED strings

Posted: 26 Mar 2008 ?? ?Print Version ?Bookmark and Share

Keywords:HB LED drivers? solution size? high-brightness LEDs?

Maxim Integrated Products has introduced the MAX16815/MAX16828/MAX16835/MAX16836 high-voltage, linear high-brightness LED (HB LED) drivers capable of driving a long string of HB LEDs from a 6.5V to 40V input supply.

These single-channel devices integrate a pass element with a 0.4V (typ) dropout voltage, thus eliminating the need for an external power transistor. Providing 5-percent accurate LED current control, the pass element promises excellent brightness matching while reducing the size, complexity and cost of the total LED driver solution. Additionally, these devices use an external resistor placed in series with the LEDs to adjust the output current from 35mA to 100mA (MAX16815), 35mA to 200mA (MAX16828) or 35mA to 350mA (MAX16835/MAX16836).

To simplify dimming control, these devices feature a PWM LED dimming input. These easy-to-use, versatile LED drivers are suitable for a wide range of applications including automotive map, courtesy, dome, instrument-cluster and RCL lighting; emergency warning lights; signage and indicator lighting; and architectural and ambient lighting.

Designed for harsh automotive environments, the MAX16815/MAX16828/MAX16835/MAX16836 provide robust protection features, including shortcircuit and thermal protection. A +5V regulated output that provides up to 4mA load current is also included. Additionally, these devices can implement LED current thermal foldback for the driver circuit with a single negative-temperature-coefficient (NTC) thermistor and a minimum number of external components.

The MAX16815/MAX16828 are available in a thermally enhanced, 3mm x 3mm, 6-pin TDFN package with exposed pad, and the MAX16835/MAX16836 are available in a 16-pin TQFN package with exposed pad. All devices are fully specified over the -40C to 125C automotive temperature range. Prices start at 48 cents (1,000-up, FOB USA).





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