LT3791

PRODUCTION

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

Part Models: 8
1ku List Price: Starting From $5.66

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Overview

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

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

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LT3791EFE#PBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3791EFE#TRPBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3791HFE#PBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3791HFE#TRPBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3791IFE#PBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3791IFE#TRPBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3791MPFE#PBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3791MPFE#TRPBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL
		PCN22_0068_Form Material_Report Delta Qualification Matrix
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 Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)
		PCN20_0245_Form Material_Report Delta Qualification Matrix Other Qualification Results Summary
LT3791EFE#PBF	PRODUCTION
LT3791EFE#TRPBF	PRODUCTION
LT3791HFE#PBF	PRODUCTION
LT3791HFE#TRPBF	PRODUCTION
LT3791IFE#PBF	PRODUCTION
LT3791IFE#TRPBF	PRODUCTION
LT3791MPFE#PBF	PRODUCTION
LT3791MPFE#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Oscillators 1
LTC6930-X.XX		32.768kHz to 8.192MHz Precision µPower Oscillators
Protection Switches & Controllers 1
LT4320 LT4320-1		Ideal Diode Bridge Controller
Pulse-Width Modulation (PWM) & Pulse Generators 1
LTC6992		TimerBlox: Voltage-Controlled Pulse Width Modulator (PWM)
Temperature Sensors 1
LTC2995	PRODUCTION	Temperature Sensor and Dual Voltage Monitor with Alert Outputs

Parts	Product Life Cycle	Description
LT8391	RECOMMENDED FOR NEW DESIGNS	60V Synchronous 4-Switch Buck-Boost LED Controller with Spread Spectrum

Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

LT3791
LT3791-1

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.

Evaluation Kits

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

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Product Details

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.

Resources

DC1666A - Demo Manual
4/2/2012

DC1666A - Design Files
4/3/2012

DC1666A - Schematic
4/3/2012

Latest Discussions

2 Years Ago

LT3791

Overview

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 1

Technical Articles 1

Video 1

Solutions Bulletin & Brochure 1