Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details.

MSOP-8EP-3D-image.png

Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details.

SOT25.png

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AL8841Q

Automotive 40V 1A/1.5A Step-Down LED Driver

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Description

The AL8841Q 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 1A for TSOT25 and 1.5A for MSOP-8EP package. Depending upon supply voltage and external components, this converter can provide up to 60W of output power.

The AL8841Q 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 AL8841Q is available in the thermally enhanced MSOP-8EP package and the small footprint TSOT25 package.

Feature(s)

AEC-Q100 (Grade 1) Qualification
Wide Input Voltage Range: 4.5V to 40V
Output Current up to 1A for TSOT25 and 1.5A for MSOP-8EP
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
Overtemperature Protection (OTP)
Up to 1MHz Switching Frequency
MSOP-8EP & TSOT25 Packages 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 AL8841Q is suitable for automotive applications requiring specific change control; this part is AEC-Q100 qualified, PPAP capable, and manufactured in IATF16949 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)	1.5
LED Current Accuracy (%)	5
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

Technical Documents

Recommended Soldering Techniques

TN1.pdf