LTC3779

RECOMMENDED FOR NEW DESIGNS

150V V_IN and V_OUT Synchronous 4-Switch Buck-Boost Controller

Data Sheet (Rev. A) Product Selection Table

Part Models: 6
1ku List Price: Starting From $7.07

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Overview

4-Switch Current Mode Single Inductor Architecture Allows V_IN Above, Below or Equal to V_OUT
Wide V_IN Range: 4.5V to 150V
Wide Output Voltage Range: 1.2V ≤ V_OUT ≤ 150V
Synchronous Rectification: Up to 99% Efficiency
±1% 1.2V Voltage Reference
Input or Output Average Current Limit
On-Board LDO or External NMOS LDO for DRV_CC
36V EXTV_CC LDO Powers Drivers
Programmable 6V to 10V DRV_CC Optimizes Efficiency
No Top FET Refresh Noise in Boost or Buck Mode
V_OUT Disconnected from V_IN During Shutdown
Phase-Lockable Fixed Frequency (50kHz to 600kHz)
No Reverse Current During Start-Up
Power Good Output Voltage Monitor
150V Rated RUN Pin with Accurate Turn-On Threshold
Programmable Input Overvoltage Lockout
Thermally Enhanced FE38 TSSOP Package Modified for High Voltage Operation

The LTC3779 is a high performance buck-boost switching regulator controller that operates from input voltages above, below or equal to the output voltage. The constant frequency current mode architecture allows a phaselockable frequency of up to 600kHz, while an input/output constant current loop provides support for battery charging.

With a wide 4.5V to 150V input and output range and seamless transfers between operating regions, the LTC3779 is ideal for automotive, telecom and batterypowered systems.

The LTC3779 features a precision 1.2V reference and power good output indicator. The MODE pin can select between pulse-skipping mode or forced continuous mode of operation. Pulse-skipping mode offers high efficiency at light load while forced continuous mode operates at a constant frequency for noise sensitive applications. The PLLIN pin allows the IC to be synchronized to an external clock. The SS pin ramps the output voltage during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions.

Applications

Industrial, Automotive, Medical, Military, Avionics

Part Models: 6
1ku List Price: Starting From $7.07

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
LTC3779EFE#PBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3779EFE#TRPBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3779HFE#PBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3779HFE#TRPBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3779IFE#PBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3779IFE#TRPBF	38-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 9, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only)
		PCN25_0016_Form Material_Report Qualification Results Summary
LTC3779EFE#PBF	PRODUCTION
LTC3779EFE#TRPBF	PRODUCTION
LTC3779HFE#PBF	PRODUCTION
LTC3779HFE#TRPBF	PRODUCTION
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
LTC3779EFE#PBF	PRODUCTION
LTC3779EFE#TRPBF	PRODUCTION
LTC3779HFE#PBF	PRODUCTION
LTC3779HFE#TRPBF	PRODUCTION
LTC3779IFE#PBF	PRODUCTION
LTC3779IFE#TRPBF	PRODUCTION
Feb 14, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only)
		PCN25_0016_Form Material_Report Qualification Results Summary
LTC3779IFE#PBF	PRODUCTION
LTC3779IFE#TRPBF	PRODUCTION

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

Software Resources

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Tools & Simulations

LTspice 1

LTC3779 Demo Circuit

Models for the following parts are available in LTspice:

LTC3779

LTpowerCAD 1

LTC3779 Project - 16-120Vin to 48Vo / 10A, 200kHz

Design tools for the following parts are available in LTpowerCAD:

LTC3779

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.

LTpowerCAD^® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

Evaluation Kits

LTC3779EFE Demo Board | 16V ≤ VIN ≤ 120V, VOUT = 48V @ 10A at up to 99% Efficiency

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Product Details

Demonstration circuit 2456A is a high voltage, high efficiency synchronous buck-boost DC/DC converter with a 16V to 120V input voltage range. It can supply a 10A maximum load current with a 48V output. The demo board features the LTC3779EFE controller. The constant frequency current mode architecture allows a phase-lockable frequency of up to 600kHz, while an optional output current feedback loop provides support for applications such as battery charging. With a wide input range, wide output range and seamless transfers between operation modes, the LTC3779 is ideal for Industrial, Automotive, Medical, Military and Avionics applications.