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Automotive-Grade, Constant-Current PWM Dimmable Buck Regulator LED Driver

A6217, A6217-1

A6217 Product Image

A6217 ECAD Model
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Description

Top Features

Packaging

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
  • 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

10-pin DFN with wettable flank (suffix EJ)

8-pin SOICN (suffix LJ)

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Part Number Specifications and Availability

Documentation and Resources

Documentation

Filter Document Type:
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All Types Application Note Brochure Guide
Documents Found: 32
Document Type Document Name
Application Note
Design Considerations in Selection of Converter Configuration for Automotive LED Headlight Applications
Brochure
Brochure: Driving Change by Advancing Personal Mobility Through Cutting-Edge Technology
Guide
A6217 Evaluation Board User Guide