LTC3779
150V VIN and VOUT Synchronous 4-Switch Buck-Boost Controller
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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 Categories
Product Lifecycle
Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
Documentation & Resources
-
R526 Reliability Data3/26/2018
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DC2456A - Demo Manual9/19/2017
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80V to 150V Non-Isolated DC/DC2/6/2018
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High Voltage Non-Isolated Devices1/5/2018
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.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.
LTspice Simulations
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.
To open the project file for this circuit:
Step 1: Download and install LTpowerCAD on your computer.
Step 2: Click on the link(s) in the section below to download part-specific project files.
Step 3: If the project file doesn't run, right-click the link and select "Save Target As." Then start the LTpowerCAD tool and open the project file by selecing "Open Project" from the "File" menu.
LTpowerCAD Project Files
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.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LTC3779EFE#PBF | Material Declaration | Reliability Data | 38-Lead TSSOP w/ EP | |
| LTC3779EFE#TRPBF | Material Declaration | Reliability Data | 38-Lead TSSOP w/ EP | |
| LTC3779HFE#PBF | Material Declaration | Reliability Data | 38-Lead TSSOP w/ EP | |
| LTC3779HFE#TRPBF | Material Declaration | Reliability Data | 38-Lead TSSOP w/ EP | |
| LTC3779IFE#PBF | Material Declaration | Reliability Data | 38-Lead TSSOP w/ EP | |
| LTC3779IFE#TRPBF | Material Declaration | Reliability Data | 38-Lead TSSOP w/ EP | |
| Wafer Fabrication Data | R526 Reliability Data |
PCN-PDN Information
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Support & Discussions
LTC3779 Discussions
Sample & Buy
Ordering FAQs
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Buy Now Pricing
(**) Displayed Buy Now Price and Price Range is based on small quantity orders.
List Pricing
(*)The 1Ku 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. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
Lead Times
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Sampling
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Evaluation Boards
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.