60V Synchronous 4-Switch Buck-Boost LED Driver Controller

The LT8391D is a synchronous 4-switch buck-boost LED controller that regulates LED current from an input voltage above, below, or equal to the output voltage. The proprietary peak-buck peak-boost current mode control scheme allows adjustable 150kHz to 650kHz fixed frequency operation, or internal ±15% triangle spread spectrum operation for low EMI. With 4V to 60V input, 0V to 60V output, and seamless low noise transitions between operation regions, the LT8391D is ideal for LED driver applications in automotive, industrial, and battery-powered systems.

The LT8391D provides LED current PWM dimming with an option low-side NMOS switch. The CTRL pin provides flexible 20:1 analog dimming with ±4% LED current accuracy at 100mV full scale. Fault protection is provided to detect an open or short LED condition, during which the LT8391D retries, latches off, or keeps running.

APPLICATIONS

* Automotive Head Lamps/Running Lamps

* High Frequency LED Lighting

* 4-Switch Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT

* Synchronous Switching: Up to 98% Efficiency

* Proprietary Peak-Buck Peak-Boost Current Mode

* Wide VIN Range: 4V to 60V

* Wide VOUT Range: 0V to 60V

* ±4% LED Current Accuracy