Buck LED drivers from Diodes feature 4.5-40V input voltage range


Diodes has launched the AL8843Q and AL8862Q automotive-compliant DC-DC buck LED drivers, designed for single and multiple LED strings in and around vehicles.

Applications include daytime running lights as well as fog lights, turn lights, and brake/stop lights.

The devices’ supply voltage range 4.5-40V (AL8862Q up to 55V), in order to withstand voltage variations, such as load dumps during low cranking or stop-start operation, without suffering any corresponding degradation in the LED drive current.

Both parts feature an integrated power mosfet, 40V/0.2Ω for the AL8843Q and 55V/0.4Ω for the AL8862Q. They also feature hysteretic-mode buck LED driver control, which simplifies the feedback loop enabling engineers to realize stable buck converter designs using four external components.

Both parts support 0% to 100% PWM dimming, controlled with either an analog input between 0.4V and 2.5V or a PWM signal generated by an external microcontroller or host processor. Safety features include overtemperature protection as well as LED short- and open-circuit protection. The AL8862Q incorporates an open-drain fault indication pin, which is asserted low to report faulty conditions.

The devices’ certifications include AEC-Q100 grade 1, PPAP document support, and they are manufactured in IATF16949 certified facilities.


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