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Description

The AL8862Q is a step-down DC/DC converter designed to drive LEDs with a constant current. The AL8862Q operates with an input supply voltage from 5V to 55V and provides an externally adjustable output current up to 1A. Series connection of the LEDs provides identical LED currents resulting in uniform brightness and eliminating the need for ballast resistors. The AL8862Q switches at frequency up to 1MHz. This allows the use of smaller size external components, hence minimizing the PCB size.

The AL8862Q integrates the power switch and a high-side output current sensing circuit. Maximum output current of AL8862Q is set via an external resistor connected between the VIN and SET input pins. Dimming is achieved by applying either a DC voltage or a PWM signal at the CTRL input pin. The soft-start time can be adjusted using an external capacitor from the CTRL pin to ground. An input voltage of 0.3V or lower at CTRL pin will shut down the power switch.

The AL8862Q has been qualified to AEC-Q100 Grade 1 and is Automotive Grade supporting PPAPs.

Application

  • Automotive Interior LED Lamps
  • Automotive Exterior LED Lamps

Features

  • AEC-Q100 Grade 1 Qualified
  • Wide Input Voltage Range: 5V to 55V
  • Output Current up to 1A
  • Internal 55V NDMOS Switch
  • Typical 4% Output Current Accuracy
  • Single Pin for On/Off and Brightness Control by DC Voltage or PWM Signal
  • High Efficiency (Up to 97%)
  • Fault Status Indication for Abnormal Operation
  • LED Short-Circuit Protection
  • Inherent Open-Circuit LED Protection
  • Current-Sense Resistor Short-Circuit Protection
  • Over-Temperature Shutdown
  • Up to 1MHz Switching Frequency
  • SO-8EP Packages Available in Green Molding Compound (No Br, Sb)
  • Totally Lead-Free & Fully RoHS Compliant
  • Halogen and Antimony Free. Green Device

Product Specifications

Product Parameters

Qualified to AECQ10x Yes
Automotive Compliant PPAP Yes
Topologies (Buck) No
Topologies (Buck-Boost) No
Topologies (Boost) Yes
Minimum Input Voltage 5 V
Maximum Input Voltage 55 V
Maximum Output Voltage 50 V
Maximum LED Current 1 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

Calculators

Recommended Soldering Techniques

TN1.pdf

RoHS CofC

Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
AL8862QSP-13 Digi-Key Electronics 7047 5/26/2020 Buy Now United States
AL8862QSP-13 Mouser Electronics Inc. 4579 5/26/2020 Buy Now United States
AL8862QSP-13 Future Electronics - Europe 2500 5/25/2020 England

FAQs

Related Application FAQs