LT8391 60 V Synchronous 4-Switch Buck-Boost LED Controller

Analog Devices' LT8391 is a 60 V synchronous 4-switch buck-boost LED controller. This device allows for adjustable and synchronizable 150 kHz to 650 kHz fixed frequency operation for the LT8391 and 600 kHz to 2 MHz fixed frequency operation for the LT8391A. With 4 V to 60 V input, 0 V to 60 V output, and seamless low noise transitions between operation regions.

The LT8391 provides both internal (up to 128:1) and external (up to 2000:1) LED current PWM dimming with a high-side PMOS switch. Two CTRL pins provide flexible 20:1 analog dimming with ±3% LED current accuracy at 100 mV full scale. Fault protection is provided to detect an open or short LED condition, during which the controller retries, latches off, or keeps running. The LT8391 is ideal for LED driver and battery charger applications in automotive, industrial, and battery-powered systems.

Features
4-switch output Single inductor architecture allows VIN above, below, or equal to VOUT Wide VIN range: 4 V to 60 V Wide VOUT range: 0 V to 60 V (51 V LED) Synchronous switching: up to 98% efficiency Proprietary peak-buck, peak-boost current mode ±3% LED current accuracy 2000:1 external and 128:1 internal PWM dimming		High side PMOS PWM switch driver Integrated bootstrap diodes No top MOSFET refresh noise in buck or boost Adjustable and synchronizable: 150 kHz to 650 kHz (LT8391) Adjustable and synchronizable: 600 kHz to 2 MHz (LT8391A) Flicker-free spread spectrum for low EMI Open and short LED protection with fault reporting Available in 28-lead TSSOP with exposed pad and 28-lead QFN (4 mm x 5 mm)
Applications
High powered LED lighting Automotive lead lamps		Running lights