AL8843Q
AUTOMOTIVE COMPLIANT 40V 3A STEP-DOWN LED DRIVER
Description
Pin Assignments
(Top View)
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.
8
SW
7
SW
3
6
VIN
4
5
CTRL
GND
1
GND
2
SET
NC
EP
SO-8EP
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.
Applications
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Automotive Daytime Running Lights
Automotive Front and Rear Fog Lights
Automotive Turn/Stop Lights
Automotive Dimmable Interior Lights
Features
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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
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