60V, 100V Synchronous 4-Switch Buck-Boost LED Driver Controller with Low EMI

The LT8393 is a synchronous 4-switch buck-boost LED controller that regulates LED current from input voltage above, below, or equal to the output voltage. The proprietary peak-buck peak-boost current mode control scheme allows adjustable and synchronizable 350kHz to 2MHz fixed frequency operation, or internal 25% triangle spread spectrum operation for low EMI. With 4V to 60V input, 0V to 100V output, and seamless low noise transitions between operation regions, the LT8393 is ideal for LED driver and battery charger applications in automotive, industrial, and battery-powered systems.

The LT8393 provides both internal (up to 128:1) and external (up to 2000:1) LED current PWM dimming with 10V of high side PMOS gate drive. The CTRL pin provides flexible 20:1 analog dimming with ±3% LED current accuracy at 100mV full scale. Fault protection is provided to detect an open or short LED condition, during which the LT8393 retries, latches off, or keeps running.

APPLICATIONS

* Automotive Head Lamps/Running Lamps

* High Voltage LED Lighting

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

* Up to 95% Efficiency

* Proprietary Peak-Buck Peak-Boost Current Mode

* Wide VIN Range: 4V to 60V

* Wide VOUT Range: 0V to 100V

* ±4% LED Current Accuracy

* 2000:1 External and 128:1 Internal PWM Dimming