Linear Technology' (www.linear.com) LT3791 is a synchronous 4-switch buck-boost LED driver and voltage regulator controller. The controller operates from input voltages above, below, or equal to the output voltage. The LT3791 has a wide 4.7V to 60V input and 0V to 60V output range along with seamless transitions between operating modes.

A ground reference voltage FB pin serves as the input for several LED protection features and also makes it possible for the converter to operate as a constant-voltage source. The LT3791 is ideal for a wide variety of applications.

The LT3791 runs in forced continuous mode, which is ideal for systems with stringent EMI requirements. Fault protection is provided to survive and report an open or shorted LED condition. A timer allows the LT3791 to continue to run, latch off or restart when a fault occurs.

Features
4-Switch Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT
Wide VIN Range: 4.7V to 60V
Wide VOUT Range: 0V to 60V (55V LED)
±2% Output Voltage Accuracy
Synchronous Switching: Up to 98.5% Efficiency
±6% LED Current Accuracy: 0V ≤ VOUT < 60V
VOUT Disconnected from VIN During Shutdown
Accurate Rail-to-Rail LED Current Sense with Monitor Output
Input Current Sense with Monitor Output
PWM and Analog Dimming
Capable of 100W or greater per IC
38-Lead TSSOP with Exposed Pad

Applications
- Automotive Headlamps/Running Lamps
- General Purpose Lighting