Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details. SO-8EP
AUTOMOTIVE COMPLIANT 40V 3A STEP-DOWN LED DRIVER
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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.
AEC Qualified |
Yes |
|---|---|
Compliance (Only Automotive Supports PPAP) |
Automotive |
Topologies (Buck) |
Yes |
Topologies (Buck-Boost) |
No |
Topologies (Boost) |
No |
Topologies (SEPIC) |
No |
MinimumInput Voltage (V) |
4.5 |
MaximumInput Voltage (V) |
40 |
Maximum Output Voltage (V) |
36 |
Maximum LED Current (A) |
3 |
LED Current Accuracy (%) |
4 |
Switching Frequency Maximum (kHz) |
1000 |
Dimming (PWM) |
Yes |
Dimming (Analog) |
Yes |
Efficiency (%) |
98 |
Sense/Feedback Voltage (mV) |
100 |
AEC-Q100 Grade |
1 |
Operating Temperature Range (°C) |
-40 to 125 |
A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.
| PCN # | Issue Date | Implementation Date | Subject |
|---|---|---|---|
| PCN-2770 | 2025-10-30 | 2025-10-30 | Add Fab Site Code, Country of Diffusion (COD) and Assembly Site Origin (ASO) on Product and Shipping Labels for all Diodes Products |
| PCN-2754 | 2025-07-10 | 2025-10-09 | Additional Wafer Source – (SPFAB) |
