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MBI1838Q is an instant On/Off LED driver for LED automotive lighting and backlighting applications and exploits PrecisionDrive™ technology to enhance its output characteristics. At the MBI1838Q output stage, 8 regulated current ports are designed to provide uniform and constant current sinks for driving LEDs within a large range of VF variations, and in order to eliminate the heat generated by VF variations, a feedback function is integrated into MBI1838Q to control the LED power source.
MBI1838Q provides 8-channel constant current ports to match LEDs with equal current. Users may adjust the output current from 15mA to 80mA through an external resistor, Rext, which gives users flexibility in controlling the light intensity of LEDs. In addition, users can precisely adjust LED brightness from 0% to 100% via output enable pin (OE) with pulse width modulation signal.
MBI1838Q can detect the error status of LED open-circuit, short-circuit, and the over temperature during the operation, and the pins, /ERR, and /TH report these fault conditions. When LED open-circuit or short-circuit faults happen, only the faulted channel will be shut down to avoid affecting other normal channels. MBI1838Q will disable all the output channels until the junction temperature is lower than the hysteresis, if the over-temperature status occurs.
Additionally, to ensure system reliability, MBI1838Q is built with a thermal pad which enhances heat dissipation.