Diodes Menu Close

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.

Application

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

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/

Product Specifications

Product Parameters

Qualified to AECQ10x Yes
Automotive Compliant PPAP Automotive
Topologies (Buck) Yes
Topologies (Buck-Boost) No
Topologies (Boost) No
Minimum Input Voltage 4.5 V
Maximum Input Voltage 40 V
Maximum Output Voltage 36 V
Maximum LED Current 3 A
LED Current Accuracy 4 %
Switching Frequency Maximum 1000 kHz
Dimming (PWM) Yes
Dimming (Analog) Yes
Efficiency 98 %
Operating Temperature Range -40 to 125 °C
Sense Voltage 100 mV
AEC-Q100 Grade 1

Technical Documents

SPICE/IBIS Model Documents

Evaluation Board User Guides

Recommended Soldering Techniques

TN1.pdf

RoHS CofC

Orderable Part Number Buy from Distributor / Contact Sales Request Samples
AL8843QSP-13

AL8843QSP-13

Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
Digi-Key Electronics 14152 12/5/2020 Europe, Asia, North America Buy Now
Mouser Electronics Inc. 4490 12/5/2020 South America, North America, Asia, Europe, Middle East Buy Now
Request Sample

FAQs

Related Application FAQs