A6217 and A6217-1: Automotive-Grade, Constant-Current PWM Dimmable Buck Regulator LED Driver

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 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

Top Features

  • 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

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check Stock
A6217KEJTR-1-J n/a -20°C to 85°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A6217KEJTR-J n/a -20°C to 85°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
APEK6217KEJ-01-MH-0 DEMO BOARD -20°C to 85°C No -- Contact your
local sales rep
Check
Distributor Stock
APEK6217KEJ-01-MH-01 DEMO BOARD -20°C to 85°C No -- Contact your
local sales rep
Check
Distributor Stock
APEK6217KLJ-01-MH DEMO BOARD -20°C to 85°C No -- Contact your
local sales rep
Check
Distributor Stock
APEK6217KLJ-01-MH-01 DEMO BOARD -20°C to 85°C No -- Contact your
local sales rep
Check
Distributor Stock
A6217KLJTR-1-T 8-lead SOIC -40°C to 125°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A6217KLJTR-T 8-lead SOIC -40°C to 125°C Yes View Data Contact your
local sales rep
Check
Distributor Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

Packaging

A6217  Packages

Design Support Tools