Products Overview


Allegro MicroSystems

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

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.

Product Number: A6217, A6217-1

Class: Integrated Circuits(ICs), Power Management(PMIC), LED Drivers

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

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

Applications :
Automotive lighting Daytime running lights Front and rear fog lights
Turn/stop lights Map light Dimmable interior lights

Part Number Type Output Current Topology Mounting Style Operating Frequency Dimming Applications Maximum Frequency Operating Temperature Voltage - Supply Package Type
A6217 DC DC Regulato 1.5A Step-Down (Buck) Surface Mount - PWM Automotive 2 kHz -40 °C ~ 125 °C(TJ) 6V ~ 48V 10-pin DFN with wettable flank(suffix EJ)
8-pin SOICN (suffix LJ)

See more...Allegro

  • See below for downloadable documentation, software, and other resources.

    Datasheet Download on Jun, 2022

Main Products

Allegro Micro Systems