LT3791
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LT3791

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

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Info: : PRODUCTION tooltip
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Part Details
Part Models 8
1ku List Price Starting From $5.66
Features
  • 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
Additional Details
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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

Part Models 8
1ku List Price Starting From $5.66

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Documentation

Documentation

Video

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

PCN

Apr 6, 2022

- 22_0068

Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

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Jul 31, 2020

- 20_0245

Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)

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Filter by Model

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Reset Filters

Part Models

Product Lifecycle

PCN

Apr 6, 2022

- 22_0068

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Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LT3791EFE#PBF

PRODUCTION

LT3791EFE#TRPBF

PRODUCTION

LT3791HFE#PBF

PRODUCTION

LT3791HFE#TRPBF

PRODUCTION

LT3791IFE#PBF

PRODUCTION

LT3791IFE#TRPBF

PRODUCTION

LT3791MPFE#PBF

PRODUCTION

LT3791MPFE#TRPBF

PRODUCTION

Jul 31, 2020

- 20_0245

arrow down

Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)

LT3791EFE#PBF

PRODUCTION

LT3791EFE#TRPBF

PRODUCTION

LT3791HFE#PBF

PRODUCTION

LT3791HFE#TRPBF

PRODUCTION

LT3791IFE#PBF

PRODUCTION

LT3791IFE#TRPBF

PRODUCTION

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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

reference details image

DC1666A

LT3791 Demo Board | 4.7V to 60V Input Drives 25V of LEDs at 2A (Scalable to 100W)

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DC1666A

LT3791 Demo Board | 4.7V to 60V Input Drives 25V of LEDs at 2A (Scalable to 100W)

LT3791 Demo Board | 4.7V to 60V Input Drives 25V of LEDs at 2A (Scalable to 100W)

Product Detail

Demonstration circuit DC1666A is a synchronous four-switch buck-boost LED driver controller. It accepts an input voltage from 4.7V to 60V, and drives up to 25V of LEDs at 2A. DC1666A features both PWM and analog dimming of the LED string. It has an OPENLED flag that indicates when the LED string has been removed and it has a SHORTLED flag that indicates that the output has been shorted to GND. In both cases, the IC remains in control and well protected.

Tools & Simulations

Tools & Simulations 1

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

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