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A6261

Allegro MicroSystems
Part Number A6261
Manufacturer Allegro MicroSystems
Description Protected LED Array Driver
Published Dec 5, 2011
Detailed Description A6261 Protected LED Array Driver FEATURES AND BENEFITS • AEC-Q100 qualified • Total LED drive current up to 400 mA (LP,...
Datasheet PDF File A6261 PDF File

A6261
A6261


Overview
A6261 Protected LED Array Driver FEATURES AND BENEFITS • AEC-Q100 qualified • Total LED drive current up to 400 mA (LP, LJ, and LY packages) or 300 mA (LJ) • Current shared equally up to 100 mA by up to 4 strings (LP and LY) • 6 to 50 V supply • Low dropout voltage • LED output short-to-ground and thermal protection • Disable on open LED detection option • Enable input for PWM control • Current slew rate limit during PWM • Current set by reference resistor • Automotive temperature range (K, –40°C to 150°C) PACKAGES 8-pin SOICN with exposed thermal pad (suffix LJ) 10-pin MSOP with exposed thermal pad (suffix LY) 16-pin TSSOP with exposed thermal pad (suffix LP) Not to scale DESCRIPTION TheA6261 is a linear, programmable current regulator providing up to 100 mA from each of four outputs (LP and LY) to drive arrays of high brightness LEDs.
The regulated LED current from each output, accurate to 5%, is set by a single reference resistor.
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.
The A6261 in the LJ package offers two pins with 200 mA each channel (A6261LJ-1) and with 100 mA and 200 mA maximum output current (A6261LJ).
Output control is provided by an enable input, giving direct control for PWM applications.
Outputs can be connected in parallel or left unused as required.
Short detection is provided to protect the LEDs and the A6261 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 an 8-pin SOICN (suffix LJ), a 10-pin MSOP (LY), and a 16-pin TSSOP (LP), all with exposed pad for enhanced thermal dissipation.
They are lead (Pb) free, with 100% matt...


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