LTC3780
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LTC3780

High Efficiency, Synchronous, 4-Switch Buck-Boost Controller

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LTspice LTC3780 Demo Circuit - High Efficiency, Synchronous, 4-Switch Buck-Boost DC/DC Converter (6-30V to 12V @ 5A) Download 7.00KB LTspice LTC3780 / LTC4444 Demo Circuit - Synchronous Buck-Boost Controller using a N-Channel MOSFET Driver (8-48V to 12V @ 3A) Download 7.00KB LTspice LTC3780 - Buck-Boost Regulators Download 4.72 KB
Part Models 10
1ku List Price Starting From $6.16
Features
  • Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT
  • Wide VIN Range: 4V to 36V Operation
  • Synchronous Rectification: Up to 98% Efficiency
  • Current Mode Control
  • ±1% Output Voltage Accuracy: 0.8V < VOUT < 30V
  • Phase-Lockable Fixed Frequency: 200kHz to 400kHz
  • Power Good Output Voltage Monitor
  • Internal LDO for MOSFET Supply
  • Quad N-Channel MOSFET Synchronous Drive
  • VOUT Disconnected from VIN During Shutdown
  • Adjustable Soft-Start Current Ramping
  • Foldback Output Current Limiting
  • Selectable Low Current Modes
  • Output Overvoltage Protection
  • Available in 24-Lead SSOP and Exposed Pad (5mm × 5mm) 32-Lead QFN Packages
Additional Details
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The LTC3780 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 phase-lockable frequency of up to 400kHz. With a wide 4V to 30V (36V maximum) input and output range and seamless transfers between operating modes, the LTC3780 is ideal for automotive, telecom and battery-powered systems.

The operating mode of the controller is determined through the FCB pin. For boost operation, the FCB mode pin can select among Burst Mode® operation, discontinuous mode and forced continuous mode. During buck operation, the FCB mode pin can select among skip-cycle mode, discontinuous mode and forced continuous mode. Burst Mode operation and skip-cycle mode provide high efficiency operation at light loads while forced continuous mode and discontinuous mode operate at a constant frequency.

Fault protection is provided by an output overvoltage comparator and internal foldback current limiting. A power good output pin indicates when the output is within 7.5% of its designed set point.

Applications

  • Automotive Systems
  • Telecom Systems
  • DC Power Distribution Systems
  • High Power Battery-Operated Devices
  • Industrial Control
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file View Data Sheet (Rev.G)
Documentation View All Documentation
LTspice LTC3780 Demo Circuit - High Efficiency, Synchronous, 4-Switch Buck-Boost DC/DC Converter (6-30V to 12V @ 5A) Download 7.00KB LTspice LTC3780 / LTC4444 Demo Circuit - Synchronous Buck-Boost Controller using a N-Channel MOSFET Driver (8-48V to 12V @ 3A) Download 7.00KB LTspice LTC3780 - Buck-Boost Regulators Download 4.72 KB
Part Models 10
1ku List Price Starting From $6.16
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LTC3780

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Data Sheet

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UPDATED 04/03/2013
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LTC3780: High Efficiency, Synchronous, 4-Switch Buck-Boost Controller Data Sheet (Rev.G)

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UPDATED 07/08/2009
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LTC3780: 高効率の同期整流式4スイッチ昇降圧コントローラ データシート

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User Guide

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UPDATED 01/15/2010
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DC1155A - Demo Manual redirect icon

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DC1046A - Demo Manual redirect icon

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UPDATED 09/24/2009
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DC686A - Demo Manual redirect icon

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Design Note

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UPDATED 03/26/2014
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DN369 - Industry's First 4-Switch Buck-Boost Controller Achieves Highest Efficiency Using a Single Inductor redirect icon

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UPDATED 07/12/2005
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DN369 - 业界首款四开关降压-升压型控制器采用单个电感器实现了极高的效率 redirect icon

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UPDATED 04/20/2006
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DN369 - 業界初の4スイッチ昇降圧コントローラにより1個のインダクタで最高効率を実現 redirect icon

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Reliability Data

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Documentation

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2017-09-18

Small Size and Very High Efficiency Buck-Boost Converter - LTC3780

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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
LTC3780EG#PBF 24-Lead SSOP external-link
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LTC3780EG#TRPBF 24-Lead SSOP external-link
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LTC3780EUH#PBF 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) external-link
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LTC3780EUH#TRPBF 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) external-link
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LTC3780IG#PBF 24-Lead SSOP external-link
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LTC3780IG#TRPBF 24-Lead SSOP external-link
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LTC3780IUH#PBF 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) external-link
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LTC3780IUH#TRPBF 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) external-link
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LTC3780MPG#PBF 24-Lead SSOP external-link
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LTC3780MPG#TRPBF 24-Lead SSOP external-link
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Laser Top Mark Conversion for SSOP Packages Assembled in PNG

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Jan 20, 2022

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Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

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Aug 6, 2022

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Laser Top Mark Conversion for SSOP Packages Assembled in PNG

LTC3780EG#PBF

PRODUCTION

LTC3780EG#TRPBF

PRODUCTION

LTC3780IG#PBF

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LTC3780IG#TRPBF

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LTC3780MPG#PBF

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LTC3780MPG#TRPBF

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PCN22_0171_Form

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Material_Report

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Delta Qualification Matrix

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Jan 20, 2022

- 21_0269

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Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC3780EUH#PBF

PRODUCTION

LTC3780EUH#TRPBF

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LTC3780IUH#PBF

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LTC3780IUH#TRPBF

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Software & Part Ecosystem

Parts Product Life Cycle Description

µModule Buck-Boost Regulators1
LTM4607
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RECOMMENDED FOR NEW DESIGNS

36VIN, 24VOUT High Efficiency Buck-Boost DC/DC µModule (Power Module)

Parts Product Life Cycle Description
LTC3789
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RECOMMENDED FOR NEW DESIGNS

High Efficiency, Synchronous, 4-Switch Buck-Boost Controller

Evaluation Kits 3

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DC686A

LTC3780EG Demo Board | Buck-Boost, 5V to 32VIN, VOUT = 12V @ 5A max

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DC686A

LTC3780EG Demo Board | Buck-Boost, 5V to 32VIN, VOUT = 12V @ 5A max

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DC686A
LTC3780EG Demo Board | Buck-Boost, 5V to 32VIN, VOUT = 12V @ 5A max
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Product Detail

Demonstration circuit 686, featuring the LTC3780 controller, is a high efficiency buck-boost DC/DC converter that can regulate its output from input voltages both above and below the output. The demo board delivers 12V@5A from an input range of 5V to 32V.



Resources

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DC686A - Demo Manual Download

362.00K

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DC686A - Design File Download

1.00M

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DC686A - Schematic Download

221.00K

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DC1155A

LTC3780EUH Demo Board | Synchronous Buck-Boost Controller

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DC1155A

LTC3780EUH Demo Board | Synchronous Buck-Boost Controller

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DC1155A
LTC3780EUH Demo Board | Synchronous Buck-Boost Controller
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Product Detail

Demonstration circuit 1155A is a compact high efficiency synchronous buck-boost DC/DC converter solution featuring the LTC3780EUH controller. with 6V to 32V input range. It can supply 2A maximum load current at 12V output. The constant frequency current mode architecture allows a phase-lockable frequency of up to 400kHz.

Resources

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DC1155A - Design Files Download

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DC1155A - Demo Manual Download

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DC1155A - Schematic Download

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DC1046A

LTC3780EG/LTC4440ES6 Demo Board | Buck-Boost, VIN: 36V to 72V, VOUT 48V/5A

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DC1046A

LTC3780EG/LTC4440ES6 Demo Board | Buck-Boost, VIN: 36V to 72V, VOUT 48V/5A

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DC1046A
LTC3780EG/LTC4440ES6 Demo Board | Buck-Boost, VIN: 36V to 72V, VOUT 48V/5A
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Product Detail

Demonstration circuit 1046A is a non-isolated, high efficiency buck-boost DC/DC supply featuring LTC3780EG and LTC4440ES6. The LTC3780 is a high performance 4-switch synchronous buck boost regulator and the LTC4440 is a 100V-rated FET driver. The input voltage of the demo board is designed for 36V to 72V. The output voltage is 48V. At 25C° room temperature, the maximum output current is 5A without a cooling fan and 6A with 150LFM air flow for cooling. An optional 12V bias flyback supply using the LTC3803 is stuffed on the board to power the LTC3780 and LTC4440.

Resources

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DC1046A - Design File Download

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DC1046A - Demo Manual Download

721.00K

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DC1046A - Schematic Download

54.00K

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Evaluation Kits3

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DC686A

LTC3780EG Demo Board | Buck-Boost, 5V to 32VIN, VOUT = 12V @ 5A max
evaluation kit item images

DC1155A

LTC3780EUH Demo Board | Synchronous Buck-Boost Controller
evaluation kit item images

DC1046A

LTC3780EG/LTC4440ES6 Demo Board | Buck-Boost, VIN: 36V to 72V, VOUT 48V/5A

Tools & Simulations 2

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.

spice tool Lt Spice

LTC3780 Demo Circuit - High Efficiency, Synchronous, 4-Switch Buck-Boost DC/DC Converter (6-30V to 12V @ 5A) Download

7.00K

spice tool Lt Spice

LTC3780 / LTC4444 Demo Circuit - Synchronous Buck-Boost Controller using a N-Channel MOSFET Driver (8-48V to 12V @ 3A) Download

7.00K

spice tool Lt Spice

LTC3780 - Buck-Boost Regulators Download

4.72 K

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