A6214 and A6216: Automotive-Grade, Constant-Current 2 A PWM Dimmable Buck Regulator LED Driver

The A6214 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 pulse-width-modulation (PWM) signal at the Enable pin. Alternatively, an Analog Dimming input can be used to calibrate the LED current, or implement thermal foldback in conjunction with external NTC thermistor.

The A6216 has the added capability to generate its own PWM dimming frequency and duty cycle in stand-alone mode.

The A6214 is provided in a compact 10-pin narrow SOIC package (suffix LK). The A6216 is in 16-pin TSSOP (suffix LP), both with exposed pad for enhanced thermal dissipation. It is lead (Pb) free, with 100% matte-tin leadframe plating.

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Automotive lighting:

• Daytime running lights
• Front and rear fog lights
• Turn/stop lights
• Map light
• Dimmable interior lights

• AEC-Q100 qualified
• Supply voltage 4.5 to 55 V
• 2 A maximum output over operating temperature range
• Integrated MOSFET switch
• Able to use either Schottky or silicon low-side diode
• True average output current control
• Internal control loop compensation
• Integrated 5 V, 10 mA regulator for driving external load
• 通过直接的PWM调光逻辑输入到0.1%200 Hz
• Standalone internal PWM dimming (A6216)
• Analog dimming for brightness calibration and thermal foldback
• Low-power shutdown (1 μA typical)
• Fault flag output (A6216)
• LED string open and short protection
• Cycle-by-cycle current limit
• Undervoltage lockout (UVLO) and thermal shutdown (TSD)
• Robust protection against:
  • Adjacent pin-to-pin short
  • Pin-to-GND short
  • 组件打开/短的缺点