A6217 Datasheet | Allegro MicroSystems

A6217 and A6217-1 Automotive-Grade, Constant-Current PWM Dimmable Buck Regulator LED Driver Features AND BENEFITS - AEC-Q100 qualified - 6 to 48 V supply voltage - True average output current control - 3 A maximum output over operating temperature range (1.5 A for A6217-1) - Cycle-by-cycle current limit - Integrated MOSFET switch - Enable / PWM dimming via direct logic input or power supply voltage - Internal control loop pensation - Undervoltage lockout (UVLO) and thermal shutdown protection - Low power shutdown (1 µA typical) - Robust protection against: ▫ Adjacent pin-to-pin short ▫ Pin-to-GND short ▫ ponent open/short faults - Enhancements over A6213: ▫ Dithering of switching frequency to reduce EMI ▫ Able to drive single white LED from 18 V supply at 2.2 MHz ▫ Smaller package option PACKAGES: 10-pin DFN with wettable flank (suffix EJ) Not to scale 8-pin SOICN (suffix LJ) DESCRIPTION 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 acplished 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...