Overview

Features and Benefits

  • 4-Switch Current Mode Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT
  • Wide VIN Range: 4.5V to 150V
  • Wide Output Voltage Range: 1.2V ≤ VOUT ≤ 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 DRVCC
  • 36V EXTVCC LDO Powers Drivers
  • Programmable 6V to 10V DRVCC Optimizes Efficiency
  • No Top FET Refresh Noise in Boost or Buck Mode
  • VOUT Disconnected from VIN 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

Product Details

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

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Tools & Simulations

LTspice

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.

LTspice

Models for the following parts are available in LTspice:

LTC3779

LTpowerCAD

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.

LTPowerCAD

Design tools for the following parts are available in LTpowerCAD:

ltc3779

Design Resources

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.

Discussions

LTC3779 Discussions

RE: LTC3779 BUCK DESIGN
14 week(s) ago in Power By Linear
RE: LTC3779 BUCK DESIGN
20 week(s) ago in Power By Linear
RE: LTC3779 BUCK DESIGN
20 week(s) ago in Power By Linear
LTC3779 Didn't find what you were looking for? Ask the Analog community »

Sample & Buy

Sample & Buy functionality exists in desktop site
Back
Check Inventory


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 Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


Price Table Help