A6217 and A6217-1: Automotive-Grade, Constant-Current PWM Dimmable Buck Regulator LED Driver

The A6217 is a single IC switching regulator that provides constant-current output to drive high-power LEDs. It integrates a high-side N-channel DMOS switch for DC-to-DC step- down (buck) conversion. A true average current is output using a cycle-by-cycle, controlled on-time method.

Output current is user-selectable by an external current sense resistor. Output voltage is automatically adjusted to drive various numbers of LEDs in a single string. This ensures the optimal system efficiency.

LED dimming is accomplished by a direct logic input pulsewidth-modulation (PWM) signal at the enable pin.

The device is provided in a 3 mm × 3 mm wettable flank 10-pin DFN (suffix EJ) or an 8-pin narrow SOIC (suffix LJ), both with exposed pad for enhanced thermal dissipation. Both packages are lead (Pb) free, with 100% matte-tin leadframe plating.

APPLICATIONS:

Automotive lighting

• Daytime running lights
• Front and rear fog lights
• Turn/stop lights
• Map light
• Dimmable interior lights