A6264 - Automotive Stop/Tail LED Array Driver  DataSheet

 Features

• Total LED drive current up to 400 mA
• Current shared equally up to 100 mA by up to 4 strings
• 6 to 50 V supply
• Low dropout voltage
• LED output short-to-ground and thermal protection
• Enable input for PWM control
• Current slew rate limit during PWM
• Current set by reference resistor
• Automotive K-temperature range version (–40°C to 150°C)

Description:

The A6264 is a linear, programmable current regulator providing up to 100 mA from each of four outputs to drive arrays of high brightness LEDs. The LED current can be switched between high current and low current for stop/tail applications. The two LED current levels from each output, accurate to 5%, are set by two reference resistors. Current matching in each string is better than 10% without the use of ballast resistors. Driving LEDs with constant current ensures safe operation with maximum possible light output.

For automotive applications, optimum performance is achieved when driving 4 strings with 1 to 3 LEDs in each string, at a total current of up to 100 mA in each string. Outputs can be connected in parallel or left unused as required.

Short detection is provided to protect the LEDs and the A6264 during a short-to-ground at any LED output pin. An open LED in any of the strings disables all outputs but can be overridden. Shorted LED output pins or open LEDs are indicated by a fault flag.

A temperature monitor is included to reduce the LED drive current if the chip temperature exceeds a thermal threshold.

The device packages are a 10-pin MSOP (LY) , both with exposed pad for enhanced thermal dissipation. They are lead (Pb) free, with 100% matte tin leadframe plating

Typical Applications

Functional Block Diagram