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LED driver comes with PWM dimming, 5V regulator

Posted: 09 May 2006 ?? ?Print Version ?Bookmark and Share

Keywords:MAX16803? LED driver? PWM dimming? pulse-width modulation? output regulator?

Maxim Integrated Products introduced the MAX16803, an adjustable constant current source that provides up to 350mA of current to one or more strings of high-brightness LEDs. An operating input-voltage range of 6.5V to 40V is said to help protect against large transients such as load-dump and cold cranking. Its 40V pulse-width modulation (PWM) pin allows a wide dimming range. The MAX16803 is suitable for automotive lighting, LED display backlight, industrial and architectural lighting applications.

The MAX16803 regulator combines a 204mV current-sense reference with differential LED current sensing to provide load accuracy of 3.5 percent. According to Maxim, the device's low-dropout pass element (0.5V typical) and current-sense reference minimizes power dissipation in the system. Multiple MAX16803 LED driver ICs can be paralleled to deliver current greater than 350mA to a single high-power LED.

Brightness can be adjusted by using output PWM dimming in which the dedicated dimming input (DIM) or VIN is pulsed. Wave-shaped circuitry generates soft rise and fall LED current edges of equal duration, and is said to reduce EMI during short turn-on and turn-off transitions.

A fixed, 5V output regulator delivers up to 4mA of load current for low-power applications throughout the input-voltage range. The regulator can also power a microcontroller or other external components. The regulator stays on even when DIM is pulled low.

The product is rated for operation over the automotive temperature range (-40C to 125C), and features thermal and short-circuit protection. It is available in a thermally-enhanced, surface-mount, 5-by-5mm, 16-pin TQFN package rated at 2.67W power dissipation. It is also available in a lead-free package. Prices start at 99 cents for quantities of 1,000.




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