Diodes Incorporated announced the AL8843Q and AL8862Q automotive-compliant DC-DC buck converters, designed for driving single LEDs and multiple LED strings in and around vehicles. Applications include daytime running lights (DRL), which many manufacturers now offer as standard, as well as fog lights, turn lights, and brake/stop lights.
With a supply voltage from 4.5V and to at least 40V (AL8862Q up to 55V), the AL8843Q and AL8862Q can withstand even severe voltage variations, such as load dumps during low cranking or stop-start operation, without suffering any corresponding degradation in the LED drive current.
A high level of integration delivers high performance while minimizing the bill of materials. Both parts feature an integrated power MOSFET: 40V/0.2Ω for the AL8843Q and 55V/0.4Ω for the AL8862Q. Additionally, the devices feature hysteretic-mode buck LED driver control, which simplifies the feedback loop enabling engineers to realize highly stable buck converter designs using just four external components (more info).