Integrated automotive LED driver offers design flexibility

STMicroelectronics’ ALED6000 single-chip automotive LED driver with an integrated DC/DC converter is designed to keep the lighting intensity consistent as electrical conditions within the vehicle fluctuate. The AEC-Q100-qualified LED driver can be used in exterior lighting such as daytime running lights, headlights, rear lights, stop lights, and turn signals, as well as interior lighting.

The integrated automotive LED driver drives a single string of LEDs at up to 3 A and offers a wide input-voltage range from 4.5 V to 61 V. The on-chip converter allows buck, buck/boost, and floating-boost topologies, which delivers the flexibility to power LED strings that require a voltage above or below the input voltage while also handling supply fluctuations, said the company. The converter also can operate in low-dropout mode with close-to 100% duty cycle if the input voltage falls near or below the programmed output.

The ALED6000 implements digital dimming with a dedicated pin to apply the PWM control signal. There is also an enable pin and a sync pin that ensures low noise in multi-device applications. The output current is accurate within 3.2% and is monitored with a sense Resistor that has a typical voltage drop of 250 mV. The quiescent current is low at 2.4 mA in operation and 11 µA in shutdown. It also features a VBIAS auxiliary-input pin and pulse-skipping operation at light load.

ALED6000 block diagram (Source: STMicroelectronics)

The ALED6000 automotive LED driver in the HTSSOP16 package is in production. The LED driver is priced from $2.25 for orders of 1000 pieces. An evaluation kit (STEVAL-ILL089V1) is available.

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