LT3791 - 60V 4-Switch Synchronous Buck-Boost LED Driver Controller

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

Typical Application

LT3791 Typical Application
LT3791 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.

  Features
LT3791 OPEN LED Pin
LT3791-1 Replaces OPEN LED Pin With C/10 Pin Termination Flag

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

TSSOP-38

LT3791 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT3791EFE#PBF TSSOP 38 E $6.79 $4.75 View
LT3791EFE#TRPBF TSSOP 38 E $4.81 View
LT3791EFE-1#PBF TSSOP 38 E $6.79 $4.75 View
LT3791EFE-1#TRPBF TSSOP 38 E $4.81 View
LT3791HFE#PBF TSSOP 38 H $7.86 $5.50 View
LT3791HFE#TRPBF TSSOP 38 H $5.56 View
LT3791HFE-1#PBF TSSOP 38 H $7.86 $5.50 View
LT3791HFE-1#TRPBF TSSOP 38 H $5.56 View
LT3791IFE#PBF TSSOP 38 I $7.50 $5.25 View
LT3791IFE#TRPBF TSSOP 38 I $5.31 View
LT3791IFE-1#PBF TSSOP 38 I $7.50 $5.25 View
LT3791IFE-1#TRPBF TSSOP 38 I $5.31 View
LT3791MPFE#PBF TSSOP 38 MP $21.07 $14.75 View
LT3791MPFE#TRPBF TSSOP 38 MP $14.81 View
LT3791MPFE-1#PBF TSSOP 38 MP $21.07 $14.75 View
LT3791MPFE-1#TRPBF TSSOP 38 MP $14.81 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear 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.

Part Number Description Price Documentation
DC1666A LT3791 | 4.7V-60V input to drive 25V of LEDs at 2A (scalable to 100W). $200.00
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Click here to view our complete list of demo boards

Applications

  • Automotive Head Lamps/Running Lamps
  • General Purpose Lighting

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Design Tools

LTpowerCAD

The LTpowerCAD II design tool is a complete power supply design tool program that can significantly ease the tasks of power supply design. It guides users to a solution, selects power stage components, provides detailed power efficiency, shows quick loop bode plot stability and load transient analysis, and can export a final design to LTspice for simulation. Click here to download LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:
LT3791-1

LTspiceIV

LTspice IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice IV

To launch a ready to run LTspice demonstration circuit for this part:

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice IV:
LT3791
LT3791-1

Technical Support