A6217 and A6217-1
Automotive-Grade, Constant-Current PWM Dimmable Buck Regulator LED Driver
FEATURES AND BENEFITS
• A...
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 Under
voltage 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 ...