MAX16804

The MAX16804 current regulator operates from a 5.5V to 40V input voltage range and delivers 35mA to 350mA to one or more strings of high-brightness LEDs (HB LEDs).The output current of the MAX16804 is set by using an external current-sense resistor in series with the LEDs. A dual-mode DIM pin and on-board 200Hz ramp generator allow PWM dimming with an analog or PWM input signal.

Features of the MAX16804 are:(1)flexible dimming control, analog or PWM control signal for PWM and theater dimming; (2)200Hz on-board ramp generator; (3)syncs to external PWM Signal (up to 2kHz); (4)5.5V to 40V Operating range; (5)35mA to 350mA adjustable LED current; (6)3% LED current accuracy; (7)high-voltage (Up to 40V) DIM pin; (8)integrated pass element with low-dropout voltage (0.5V typ); (9)additional +5V on-board regulator with 2mA capability; (10)differential LED Current sense; (11)low 200mV current-sense reference reduces power losses; (12)wave-shaped edges minimize EMI During PWM dimming; (13)output short-circuit and thermal-shutdown protection.The analog control signal at dimming input DIM allows for a theater-dimming effect to be implemented. Fast turn-on and turn-off times ensure a wide-range PWM operation,while wave-shaping circuitry minimizes EMI. The differential current-sense input increases LED current accuracy and noise immunity.

The absolute maximum ratings of the MAX16804 can be summarized as:(1)IN 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:2758.6mW.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 MAX16804 is a high-current regulator capable of providing up to 350mA of current to one or more strings of HB LEDs. A wide operating input voltage range of 5.5V to 40V makes the MAX16804 ideal for automotive applications. A +5V regulated output provides up to 2mA of current to power external circuitry. In addition, the MAX16804 features thermal and output short-circuit protection. The wide operating voltage range helps protect the MAX16804 against large transients such as those found in load-dump situations up to 45V.