MAX16803

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 widerange "pulsed" PWM operation. Wave-shaping circuitry reduces EMI.

Features of the MAX16803 are:(1)high-voltage DIM pin for dimming interface; (2)integrated pass element with low-dropout voltage (0.5v typ); (3)+5V regulated output with 4ma source capability; (4)parallel operation for LED current > 350mA; (5)differential LED current sense; (6)low shutdown supply current (12A typ); (7)low 204mV current-sense reference reduces power losses; (8)wave-shaped edges reduce radiated EMI during PWM dimming; (9)thermal shutdown; (10)output short-circuit protection; (11)available in small, thermally enhanced,5mm x 5mm, 16-Pin TQFN package.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.

The absolute maximum ratings of the MAX16803 can be summarized as:(1)IN, OUT, DIM, and EN to GND:-0.3V to +45V;(2)storage temperature range:-65 to +150;(3)operating temperature range:-40 to +125;(4)junction temperature:+150;(5)continuous power dissipation:2666.7mW.Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied.Exposure to absolute maximum rating conditions for extended periods may affect device reliability.The MAX16803 is a high-current regulator capable of providing up to a total of 350mA of current to one or more strings of HB LEDs. A wide operating input voltage range of +6.5V to +40V makes the MAX16803 ideal for automotive applications. A +5V regulated output provides up to 4mA of current to power external circuitry.In addition, the MAX16803 features thermal and output short-circuit protection. The wide operating voltage range helps protect the MAX16803 against large transients such as those found in load-dump situations up to 40V.