A6217

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 compensation 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 ▫ Component 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 accomplished by a direct logic input pulsewidth-modulation (PWM) signal at ...