Datasheet AL8843Q (Diodes)

AL8843Q AUTOMOTIVE COMPLIANT 40V 3A STEP-DOWN LE D DRIVER Description Pin Assignments
The AL8843Q is a hysteresis mode DC-DC step-down converter,
(Top View)
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 GND 1 8 SW provide an externally adjustable output current up to 3A. Depending upon supply voltage and external components, this converter can GND 2 7 SW provide up to 60W of output power. EP SET 3 6 VIN The AL8843Q integrates the power switch and a high-side output current sensing circuit, which uses an external resistor to set the NC 4 5 CTRL nominal average output current. SO-8EP Dimming can be realized by applying an external control signal to the CTRL pin. The CTRL pin wil accept either a DC voltage signal or a PWM signal. The soft-start time can be adjusted by an external capacitor from the
Applications
CTRL pin to Ground. Applying a voltage of 0.3V or lower to the CTRL • Automotive Daytime Running Lights

pin will shut down the power switch. • Automotive Front and Rear Fog Lights

The AL8843Q is available in the thermally enhanced SO-8EP package • Automotive Turn/Stop Lights

and automotive compliant, qualified to AEC-Q100 Grade 1, supports • Automotive Dimmable Interior Lights

PPAP documentations.
Features
• Qualified to AEC-Q100 Grade 1 • Wide Input Voltage Range: 4.5V to 40V • Output Current up to 3A • Internal 40V NDMOS Switch • Typical 4% Output Current Accuracy • Single Pin for On/Off and Brightness Control by DC Voltage or PWM Signal • Recommended Analog Dimming Range: 10% to 100% • Soft-Start • High Efficiency (Up to 97%) • LED Short Protection • Inherent Open-Circuit LED Protection • Over Temperature Protection (OTP) • Up to 1MHz Switching Frequency • SO-8EP Package Available in Green Molding Compound (No Br, Sb) •
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
•
Halogen and Antimony Free. “Green” Device (Note 3)
•
The AL8843Q suitable for automotive applications requiring specific change control; this part is AEC-Q100 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities. https:/ www.diodes.com/quality/product-definitions/
Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant. 2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. 4. Automotive products are AEC-Q100 qualified and are PPAP capable. Refer to https://www.diodes.com/quality/. AL8843Q 1 of 18 October 2019 Document number: DS41943 Rev. 2 - 2
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© Diodes Incorporated Document Outline Pin Assignments Description Applications Features