Features

• 4-Switch Single Inductor Architecture Allows V_IN Above, Below or Equal to V_OUT
• Synchronous Switching: Up to 98.5% Efficiency
• Wide V_IN Range: 4.7V to 60V
• Wide V_OUT Range: 0V to 60V (52V LED)
• ±6% LED Current Accuracy: 0V ≤ V_LED < 52V
• True Color PWM™ and Analog Dimming
• LED and Input Current Regulation with Current Monitor Outputs
• No Top MOSFET Refresh in Buck or Boost
• V_OUT Disconnected From V_IN During Shutdown
• Open or Shorted LED Fault Protection
• Capable of 100W or Greater per IC
• 38-Lead TSSOP with Exposed Pad

Typical Application

Description

The LT®3791 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.

The LT3791 provides input current monitor, LED current monitor, and open or shorted LED fault condition, during which the LT3791 either restarts or latches off.