MAX16805

The MAX16805 LED drivers eliminate the need for microcontrollers or switch-mode converters for automotive interior dome, map, and courtesy light applications. An EEPROM-programmable LED currentsense reference simplifies production by using one sense resistor to set the LED current for all LED bins. A dual-mode DIM pin and an on-board 200Hz ramp generator allow for PWM dimming with an analog or PWM control signal.

Features of the MAX16805 are:(1)on-board 200Hz ramp generator eliminates the need for C PWM signal; (2)flexible analog or PWM control for PWM or theater dimming; (3)5.5V to 40V input with up to 39V output capability; (4)35mA to 350mA adjustable LED current; (5)waveshaping minimizes EMI during dimming; (6)output short-circuit and overtemperature protection.The analog control signal at dimming input DIM allows for the "theater dimming" effect to be implemented. Fast turn-on/-off times ensure a wide range PWM operation, while waveshaping circuitry minimizes EMI. EEPROM-programmable LED current foldback makes it possible to operate at a high input voltage, while saving the cost and space associated with having a large heatsink.

The absolute maximum ratings of the MAX16805 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 MAX16805 uses the EEPROM Content Transfer register to transfer data from the EEPROM to the dynamic registers. A write command issued to this register transfers data from the EEPROM to the dynamic registers. Data bytes written to the EEPROM Content Transfer register do not have any significance. At power-up, the EEPROM content is automatically loaded into the dynamic registers.