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High voltage, high brightness LED driver for automotive, display and lighting applications...
Maxim introduces the MAX16803, an adjustable constant current source that delivers up to 350mA of current to drive one or more columns of high-brightness LEDs (HB LEDs). The wide input voltage range of 6.5V to 40V avoids the effects of large transients such as loads and cold starts. A wide range of brightness adjustments is achieved through the high voltage (40V) PWM pin. The MAX16803 is ideal for automotive lighting, LED display backlighting, industrial and building lighting applications. The MAX16803 regulator combines a low-voltage (204mV) current sense reference with differential LED current sensing to provide ±3.5% load current accuracy for uniform illumination across all lighting components. The device's built-in low dropout regulator (typically 0.5V) and current sense reference minimizes system power consumption. Multiple MAX16803 LED driver ICs in parallel provide up to 350mA of current and drive a single high-power LED. Brightness adjustment is performed using the output PWM dimming technique by loading a pulse input on the dimming input (DIM) or VIN pin. The waveform shaping circuit produces smooth and extended LED current rising and falling edges to suppress EMI during lighting and shutdown. The 5V fixed output regulator provides up to 4mA of load current for low power applications over the entire 6.5V to 40V input voltage range. For greater design flexibility, the regulator can also power microcontrollers or other external components. The regulator remains on even if the DIM input is pulled low. Only two small-sized ceramic capacitors and one small sense resistor are required outside the regulator, which greatly saves board size and total drive cost. The MAX16803 is rated for operation in the automotive temperature range (-40°C to +125°C) and provides thermal and short-circuit protection. The device is available in a thermally enhanced, surface mount, 5x5mm, 16-pin TQFN package with a rated power dissipation of 2.67W. Lead-free packages are also available. Maxim's adjustable constant current source, the MAX16803, is ideal for automotive lighting, LED display backlighting, industrial and building lighting applications.