Diodes Incorporated AL8862Q | Demoboard AL8862QEV2

Description

The DIODES™ 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 the ground. An input voltage of 0.3V or lower at CTRL pin will shut down the power switch. The AL8862Q is qualified to AEC-Q100 Grade 1 and is automotive grade to support PPAPs.

Features

• 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 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 AL8862Q is suitable for automotive applications requiring specific change control; this part is AEC-Q100 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities.

Typical applications

• Automotive interior LED lamps, Automotive exterior LED lamps

More information

• Datasheet
• IC product information