LT3791-1

PRODUCTION

60V 4-Switch Synchronous Buck-Boost Controller

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

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Part Details

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
2% Output Voltage Accuracy: 1.2V ≤ V_OUT < 60V
6% Output Current Accuracy: 0V ≤ V_OUT < 60V

Input and Output Current Regulation with Current Monitor Outputs
No Top FET Refresh in Buck or Boost
V_OUT Disconnected from V_IN During Shutdown
C/10 Charge Termination and Output Shorted Flags
Capable of 100W or greater per IC
38-Lead TSSOP with Exposed Pad

The LT3791-1 is a synchronous 4-switch buck-boost voltage/current regulator controller. The controller can regulate output voltage, output current, or input current with input voltages above, below, or equal to the output voltage. The constant-frequency, current mode architecture allows its frequency to be adjusted or synchronized from 200kHz to 700kHz. No top FET refresh switching cycle is needed in buck or boost operation. With 60V input, 60V output capability and seamless transitions between operating regions, the LT3791-1 is ideal for voltage regulator, battery/super-capacitor charger applications in automotive, industrial, telecom, and even battery-powered systems.

For new designs we recommend the LT8390: 60V synchronous 4-switch buck-boost controller due to its numerous performance improvements over the LT3791-1.


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

Applications

Automotive, Telecom, Industrial Systems
High Power Battery-Powered System

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-1#PBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3791EFE-1#TRPBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3791HFE-1#PBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3791HFE-1#TRPBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3791IFE-1#PBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3791IFE-1#TRPBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3791MPFE-1#PBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3791MPFE-1#TRPBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data	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-1#PBF	PRODUCTION
LT3791EFE-1#TRPBF	PRODUCTION
LT3791HFE-1#PBF	PRODUCTION
LT3791HFE-1#TRPBF	PRODUCTION
LT3791IFE-1#PBF	PRODUCTION
LT3791IFE-1#TRPBF	PRODUCTION
LT3791MPFE-1#PBF	PRODUCTION
LT3791MPFE-1#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-1#PBF	PRODUCTION
LT3791EFE-1#TRPBF	PRODUCTION
LT3791HFE-1#PBF	PRODUCTION
LT3791HFE-1#TRPBF	PRODUCTION
LT3791IFE-1#PBF	PRODUCTION
LT3791IFE-1#TRPBF	PRODUCTION
LT3791MPFE-1#PBF	PRODUCTION
LT3791MPFE-1#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 2
LTC4364	RECOMMENDED FOR NEW DESIGNS	Surge Stopper with Ideal Diode
LT4320 LT4320-1		Ideal Diode Bridge Controller
Temperature Sensors 1
LTC2995	PRODUCTION	Temperature Sensor and Dual Voltage Monitor with Alert Outputs

Parts	Product Life Cycle	Description
LT8390	RECOMMENDED FOR NEW DESIGNS	60V Synchronous 4-Switch Buck-Boost 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.

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LT3791-1

Part Details

Documentation

Data Sheet 1

Reliability Data 1

Technical Articles 1

Solutions Bulletin & Brochure 1