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

The LT3791 is a synchronous 4-switch buck-boost LED driver controller. The controller can regulate LED current up to 52V of LED string with input voltages above, below, or equal to the output voltage. The constant-frequency, forced-continuous current mode architecture allows its frequency to be adjusted or synchronized from 200kHz to 700kHz. No top MOSFET refresh switching cycle is needed in buck or boost operation. With 60V input, 60V output capability and seamless transitions between operating regions, the LT3791 is ideal for LED driver applications in automotive, industrial, and even battery-powered systems.

For new designs we recommend the LT8391: 60V synchronous 4-switch, buck-boost LED controller due to its numerous performance improvements over the LT3791.

Features

LT3791

OPEN LED Pin

LT3791-1

Replaces OPEN LED Pin With C/10 Pin Termination Flag

Applications

* Automotive Head Lamps/Running Lamps

* General Purpose Lighting

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

* Synchronous Switching: Up to 98.5% Efficiency

* Wide VIN Range: 4.7V to 60V

* Wide VOUT Range: 0V to 60V (52V LED)

* ±6% LED Current Accuracy: 0V ≤ VLED < 52V

* True Color PWM™ and Analog Dimming