LT3791 - 60V 4-Switch Synchronous Buck-Boost LED Driver Controller
- 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
- LED and Input Current Regulation with Current Monitor Outputs
- No Top MOSFET Refresh in Buck or Boost
- VOUT Disconnected From VIN During Shutdown
- Open or Shorted LED Fault Protection
- Capable of 100W or Greater per IC
- 38-Lead TSSOP with Exposed Pad
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.
|LT3791||OPEN LED Pin|
|LT3791-1||Replaces OPEN LED Pin With C/10 Pin Termination Flag|
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
|Buy Now • Request Samples|
Demo BoardsLinear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.
|DC1666A||LT3791 Demo Board | 4.7V-60V Input Drives 25V of LEDs at 2A (scalable to 100W)||$200.00|
- Automotive Head Lamps/Running Lamps
- General Purpose Lighting
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