Datasheet Diodes AL8843Q


Automotive Compliant 40V 3A Step-Down LED Driver


Datasheet AL8843Q
PDF, 1.2 Mb, Language: en, File uploaded: Dec 20, 2019, Pages: 18
Automotive Compliant 40V 3A Step-Down LED Driver
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Detailed Description

The AL8843Q is a hysteresis mode DC-DC step-down converter, designed for driving single or multiple series connected LEDs efficiently from a voltage source higher than the LED voltage.

The device can operate from an input supply between 4.5V and 40V and provide an externally adjustable output current up to 3A. Depending upon supply voltage and external components, this converter can provide up to 60W of output power.

The AL8843Q integrates the power switch and a high-side output current sensing circuit, which uses an external resistor to set the nominal average output current.

Dimming can be realized by applying an external control signal to the CTRL pin. The CTRL pin will accept either a DC voltage signal or a PWM signal.

The soft-start time can be adjusted by an external capacitor from the CTRL pin to Ground. Applying a voltage of 0.3V or lower to the CTRL pin will shut down the power switch.

The AL8843Q is available in the thermally enhanced SO-8EP package and automotive compliant, qualified to AEC-Q100 Grade 1, supports PPAP documentations.




Parameters / ModelsAL8843QSP-13
AEC-Q100 Grade1
Automotive Compliant PPAPYes
Dimming (Analog)Yes
Dimming (PWM)Yes
Efficiency98 %
LED Current Accuracy4 %
Maximum Input Voltage40 V
Maximum LED Current3 A
Maximum Output Voltage36 V
Minimum Input Voltage4.5 V
Operating Temperature Range, °C-40 to 125 °
Qualified to AECQ10xYes
Sense Voltage100 mV
Switching Frequency Maximum1000 kHz
Topologies (Boost)No
Topologies (Buck)Yes
Topologies (Buck-Boost)No

Model Line

Series: AL8843Q (1)

Manufacturer's Classification