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AL8843Q

AUTOMOTIVE COMPLIANT 40V 3A STEP-DOWN LED DRIVER

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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.

Feature(s)

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/

Application(s)

Automotive Daytime Running Lights
Automotive Front and Rear Fog Lights
Automotive Turn/Stop Lights
Automotive Dimmable Interior Lights

Product Specifications

Product Parameters

AEC Qualified	Yes
Compliance (Only Automotive supports PPAP)	Automotive
Topologies (Buck)	Yes
Topologies (Buck-Boost)	No
Topologies (Boost)	No
Topologies (Charge Pump)	No
Minimum Input Voltage (V)	4.5
Maximum Input 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
Operating Temperature Range (°C)	-40 to 125
Sense Voltage (mV)	100
AEC-Q100 Grade	1