ALLEGRO A6211GLJTR-T

The A6211 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 compact 8-pin narrow SOIC package (suffix LJ) with exposed pad for enhanced thermal dissipation It is lead (Pb) free, with 100% matte-tin leadframe plating.

• Supply voltage 6 to 48 V
• True average output current control
• 3 A maximum output over operating temperature range
• Cycle-by-cycle current limit
• Integrated MOSFET switch
• 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

• General illumination
• Scanners and multifunction printers (light bars)
• Architectural lighting
• Industrial lighting
• Display case lighting / MR16