The A6214 and A6216 single-IC switching regulators are the industry’s first automotive buck LED drivers to include PWM dimming. They provide constant-current output to drive high-power LEDs and integrate a high-side n-channel DMOS switch for dc-to-dc step-down conversion. A true average current is output using a cycle-by-cycle, controlled on-time method.
An internal 5-V, 10-mA LDO provides added flexibility and cost savings for driving external loads if required by the system. User-selectable output current provides system design and application flexibility. LED dimming is accomplished by a direct logic input 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 an external NTC thermistor.
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